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学者姓名:任晓兵

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< Page ,Total 26 >
A strategy for high performance of energy storage and transparency in KNN-based ferroelectric ceramics EI
期刊论文 | 2022 , 427 | Chemical Engineering Journal
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Abstract :

Lead-free transparent ferroelectric ceramics with superior energy storage properties are highly desirable for pulsed power technologies and the increased optical transparency demand. However, the transparency and energy storage density of lead-free bulk ceramics cannot meet the requirements of their wide applications due to the coarse microstructure and relatively low breakdown strength. In this study, a design strategy is proposed to optimize the energy storage characteristics and transparency of ceramics by introducing nanodomains, increasing the band gap energy and reducing the grain size. The results showed that submicron grain (0.21 μm) and large band gap energy (Eg = 3.21 eV) were achieved through the introduction of the second component Sr(Sc0.5Nb0.5)O3 (SSN). An excellent transparency of up to 84.5% in the near-infrared region (1378 nm), a high energy density (W) of ~4.42 J·cm−3 and an extremely small strain of ~0.022% were simultaneously achieved in the 0.825(K0.5Na0.5)NbO3-0.175Sr(Sc0.5Nb0.5)O3 (0.825KNN-0.175SSN) ceramics. These results revealed the potential applications of (K0.5Na0.5)NbO3-based ceramics for energy storage and provide a feasible approach of domain engineering to develop new lead-free energy storage transparency materials. © 2021 Elsevier B.V.

Keyword :

Energy storage Infrared devices Ferroelectric ceramics Strontium compounds Free energy Energy gap Niobium compounds Ferroelectricity Transparency

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GB/T 7714 Dai, Zhonghua , Li, Dingyan , Zhou, Zhijian et al. A strategy for high performance of energy storage and transparency in KNN-based ferroelectric ceramics [J]. | Chemical Engineering Journal , 2022 , 427 .
MLA Dai, Zhonghua et al. "A strategy for high performance of energy storage and transparency in KNN-based ferroelectric ceramics" . | Chemical Engineering Journal 427 (2022) .
APA Dai, Zhonghua , Li, Dingyan , Zhou, Zhijian , Zhou, Shun , Liu, Weiguo , Liu, Jingjing et al. A strategy for high performance of energy storage and transparency in KNN-based ferroelectric ceramics . | Chemical Engineering Journal , 2022 , 427 .
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Simultaneously increasing the strength and decreasing the modulus in TiNi alloys via plastic deformation EI
期刊论文 | 2022 , 209 | Scripta Materialia
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It is challenging to simultaneously increase strength and decrease modulus, since they are often mutually exclusive. Here, we report an easy way to achieve a 140% increase of yield stress and a 59% decrease of Young's modulus in a shape memory alloy of Ti49.2Ni50.8 via tensile plastic deformation at T0(σ) ∼283 K (T0(σ) denotes an equilibrium temperature between austenite and martensite after deformation). Through integrating experiments and Landau theory, we reveal that besides the strength increase due to strain hardening, the modulus reduction results from a state change from an austenitic state to a special dual-phase state where austenite and stress-induced martensite have the same free energy and thus exhibit the lowest modulus at T0(σ). Similar results were also found in another ferroelastic Ti49Ni51 alloy, implying that the performance of other ferroelastic materials may be further optimized using the strategy of plastic deformation at T0(σ). © 2021 Acta Materialia Inc.

Keyword :

Martensite Titanium alloys Austenite Plastic deformation Yield stress Free energy High strength alloys Shape-memory alloy Strain hardening Binary alloys Elastic moduli

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GB/T 7714 Xu, Zhizhi , Hao, Yanshuang , Ji, Yuanchao et al. Simultaneously increasing the strength and decreasing the modulus in TiNi alloys via plastic deformation [J]. | Scripta Materialia , 2022 , 209 .
MLA Xu, Zhizhi et al. "Simultaneously increasing the strength and decreasing the modulus in TiNi alloys via plastic deformation" . | Scripta Materialia 209 (2022) .
APA Xu, Zhizhi , Hao, Yanshuang , Ji, Yuanchao , Xiao, Andong , Qian, Yu , Wang, Wenjia et al. Simultaneously increasing the strength and decreasing the modulus in TiNi alloys via plastic deformation . | Scripta Materialia , 2022 , 209 .
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Excellent thermal-cycling stability caused by aging in Fe-doped (Ba0.85Ca0.15)(Ti Zr-0.9(0.1))O-3 lead-free piezoceramic EI SCIE
期刊论文 | 2021 , 202 | SCRIPTA MATERIALIA
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Abstract :

A key challenge for the practical application of lead-free piezoelectrics is how to acquire high-piezoelectricity and good thermal-cycling stability simultaneously. Here, we report that excellent thermal-cycling stability was obtained in aged (Ba0.85Ca0.15)(Ti0.9Zr0.1)(99.75/100)Fe0.25/100O3-delta lead-free piezoceramic with high-piezoelectricity (d(33) similar to 400 pC/N). No piezoelectricity degradation was found for the aged sample after 100 thermal cycles between -40 degrees C and 50 degrees C. Further studies on hysteresis loop and evolution of microstructures reveal that the excellent thermal-cycling stability is related to the point-defect migration during aging. This work indicates that aging is an effective way to obtain good thermal-cycling stability and high-piezoelectricity simultaneously. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keyword :

Piezoelectric Thermal cycling stability Aging Lead-free

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GB/T 7714 Hao, Yanshuang , He, Liqiang , Ren, Shuai et al. Excellent thermal-cycling stability caused by aging in Fe-doped (Ba0.85Ca0.15)(Ti Zr-0.9(0.1))O-3 lead-free piezoceramic [J]. | SCRIPTA MATERIALIA , 2021 , 202 .
MLA Hao, Yanshuang et al. "Excellent thermal-cycling stability caused by aging in Fe-doped (Ba0.85Ca0.15)(Ti Zr-0.9(0.1))O-3 lead-free piezoceramic" . | SCRIPTA MATERIALIA 202 (2021) .
APA Hao, Yanshuang , He, Liqiang , Ren, Shuai , Ji, Yuanchao , Ren, Xiaobing . Excellent thermal-cycling stability caused by aging in Fe-doped (Ba0.85Ca0.15)(Ti Zr-0.9(0.1))O-3 lead-free piezoceramic . | SCRIPTA MATERIALIA , 2021 , 202 .
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Nanocrystalline strain glass TiNiPt and its superelastic behavior EI SCIE
期刊论文 | 2021 , 104 (2) | PHYSICAL REVIEW B
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TiNi-based shape-memory alloys are known to exhibit a strain glass state under certain conditions, generally in the presence of high-density defects such as excess solute atoms or alloying elements, dislocations, and nanoprecipitates. In this paper, we report a strain glass transition in a nanocrystalline Ti50Ni35Pt15 alloy. The nanocrystalline strain glass state is achieved by a combined effect of high-density grain boundaries and high concentration doping of Pt atoms in the B2 matrix. The nanocrystalline Ti50Ni35Pt15 strain glass alloy showed a large near-complete progressive superelasticity with a recovery strain of about 6% and a low apparent Young's modulus of about 30 GPa in a wide temperature range of over 200 degrees C. In situ synchrotron x-ray diffraction measurement showed that the strain glass B2 [B2(SG)] phase experienced B2(SG)-> R -> B19 transformation upon loading and B19 -> B2(SG) upon unloading. The findings of this study provide insight for the development of nanocrystalline strain glass shape-memory alloys.

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GB/T 7714 Jiang, Daqiang , An, Jiale , Liu, Yinong et al. Nanocrystalline strain glass TiNiPt and its superelastic behavior [J]. | PHYSICAL REVIEW B , 2021 , 104 (2) .
MLA Jiang, Daqiang et al. "Nanocrystalline strain glass TiNiPt and its superelastic behavior" . | PHYSICAL REVIEW B 104 . 2 (2021) .
APA Jiang, Daqiang , An, Jiale , Liu, Yinong , Ma, Zhiyuan , Liu, Fangfeng , Yang, Hong et al. Nanocrystalline strain glass TiNiPt and its superelastic behavior . | PHYSICAL REVIEW B , 2021 , 104 (2) .
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Grain boundary effect on the microstructure of solution-treated Fe-rich Sm-Co-Fe-Cu-Zr alloys EI SCIE
期刊论文 | 2021 , 853 | Journal of Alloys and Compounds
WoS CC Cited Count: 2
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Abstract :

Grain boundaries with sparse 1:5H precipitates have been thought as the primary demagnetization sites of the pinning-controlled 2:17-type Sm-Co-Fe-Cu-Zr permanent magnets, leading to poor squareness as well as lower-than-ideal maximum energy product. To trace the underlying origin, here we revived their solution-treated precursors, focusing on the microstructure difference between grain boundaries and grain interiors. The transmission electron microscopy (TEM) investigations of two model magnets Sm25CobalFexCu5.6Zr3.0 (x = 19.5 and 23.5 wt%) reveal that both of them exhibit fine cellular nanostructure at the solution-treated state, with the cell interiors having 2:17R nanotwins and basal stacking faults (SFs) and the cell boundaries aggregated with defects or occupied by 1:5H nanoprecipitates. The grain boundary regions contain larger 2:17R nanovariants, less SFs and less defects-aggregated cell boundaries (DACBs) than the grain interiors, accompanied with few 1:5H nanoprecipitates constrained at the grain boundaries. The comparable results indicate that the early decomposition occurs preferably at the grain boundaries. The sparse DACBs at the grain boundary regions thus leave fewer channels to be occupied by the 1:5H precipitates than the grain interiors during the subsequent aging process. These findings help to understand why the grain boundaries of Sm-Co-Fe-Cu-Zr permanent magnets contain sparse 1:5H cell boundary phase. © 2020 Elsevier B.V.

Keyword :

Copper alloys Cobalt metallography Cytology Iron metallography Cobalt alloys Microstructure Permanent magnets Zircaloy Samarium alloys High resolution transmission electron microscopy Zirconium metallography Iron alloys Grain boundaries Precipitation (chemical) Cells Copper metallography

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GB/T 7714 Musa, Munzali , Song, Xin , Zhou, Xianglong et al. Grain boundary effect on the microstructure of solution-treated Fe-rich Sm-Co-Fe-Cu-Zr alloys [J]. | Journal of Alloys and Compounds , 2021 , 853 .
MLA Musa, Munzali et al. "Grain boundary effect on the microstructure of solution-treated Fe-rich Sm-Co-Fe-Cu-Zr alloys" . | Journal of Alloys and Compounds 853 (2021) .
APA Musa, Munzali , Song, Xin , Zhou, Xianglong , Jia, Wentao , Yuan, Tao , Ma, Tianyu et al. Grain boundary effect on the microstructure of solution-treated Fe-rich Sm-Co-Fe-Cu-Zr alloys . | Journal of Alloys and Compounds , 2021 , 853 .
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Superelasticity over a wide temperature range in metastable β-Ti shape memory alloys EI SCIE
期刊论文 | 2021 , 853 | Journal of Alloys and Compounds
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Abstract :

Shape memory alloys (SMAs) offer many technological advantages in various applications due to shape memory effect and superelasticity. Among them, superelasticity persists within a narrow temperature range ( © 2020 Elsevier B.V.

Keyword :

Elasticity Shape-memory alloy Niobium alloys Glass Nanotechnology Iron alloys Zircaloy Titanium alloys Martensite Glass transition Martensitic transformations

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GB/T 7714 Xiong, Chengyang , Li, Yan , Zhang, Jian et al. Superelasticity over a wide temperature range in metastable β-Ti shape memory alloys [J]. | Journal of Alloys and Compounds , 2021 , 853 .
MLA Xiong, Chengyang et al. "Superelasticity over a wide temperature range in metastable β-Ti shape memory alloys" . | Journal of Alloys and Compounds 853 (2021) .
APA Xiong, Chengyang , Li, Yan , Zhang, Jian , Wang, Yu , Qu, Wentao , Ji, Yuancao et al. Superelasticity over a wide temperature range in metastable β-Ti shape memory alloys . | Journal of Alloys and Compounds , 2021 , 853 .
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Atomic scale understanding of the defects process in concurrent recrystallization and precipitation of Sm-Co-Fe-Cu-Zr alloys EI SCIE
期刊论文 | 2021 , 202 , 290-301 | Acta Materialia
WoS CC Cited Count: 8
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Abstract :

Identifying the defects process in concurrent recrystallization and precipitation during aging a supersaturated solid solution is essential for understanding their interaction mechanisms and for manipulating the microstructure, but was rarely done at the atomic scale. Herein, the concurrent recrystallization and precipitation in the supersaturated hexagonal Sm(Co, Fe, Cu, Zr)7.5 alloys were studied through detailed transmission electron microscopy investigations, where the recrystallization, growth of recrystallized subgrains (cells) and precipitates stem from the gradual formation and dissociation of defects, including basal stacking faults (SFs), vacancies and excess interstitial atoms. The diffusion-controlled glides of -type partial dislocations associated with the SFs not only transform the matrix from the mixture of hexagonal Sm(Co, Fe, Cu, Zr)7 (1:7H) and Sm2(Co, Fe, Cu, Zr)17 (2:17H) to Sm-depleted rhombohedral Sm2(Co, Fe, Cu, Zr)17 (2:17R) cells but also provide continuous diffusion channels to reduce the point defects to form the Sm-enriched hexagonal Sm(Co, Fe, Cu, Zr)5 (1:5H) cell boundary precipitates and Zr-enriched rhombohedral (Sm, Zr)(Co, Fe, Cu)3 (1:3R) platelets. It indicates a diffusion-controlled displacive phase transformation mechanism, characterized by the composition-dependent 2:17R’ intermediate phase due to incomplete basal slip and incomplete solute partitioning. The growth velocities of both recrystallized cells and precipitates are closely related to the defects density, being faster due to the high defects density at early stage, and being slower due to the reduced defects density at later stage. A basal slip model is proposed to explain the formation and dissociation of defects along with the stacking period change and the simultaneous formation of continuous atomic diffusion channels. These new findings may yield a deep understanding of the interaction between recrystallization and precipitation. © 2020

Keyword :

Copper alloys Cobalt metallography Cytology Diffusion Point defects Zircaloy Cobalt alloys Iron metallography Dissociation Samarium alloys High resolution transmission electron microscopy Zirconium metallography Atoms Iron alloys Recrystallization (metallurgy) Precipitation (chemical) Cells Copper metallography

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GB/T 7714 Song, Xin , Ma, Tianyu , Zhou, Xianglong et al. Atomic scale understanding of the defects process in concurrent recrystallization and precipitation of Sm-Co-Fe-Cu-Zr alloys [J]. | Acta Materialia , 2021 , 202 : 290-301 .
MLA Song, Xin et al. "Atomic scale understanding of the defects process in concurrent recrystallization and precipitation of Sm-Co-Fe-Cu-Zr alloys" . | Acta Materialia 202 (2021) : 290-301 .
APA Song, Xin , Ma, Tianyu , Zhou, Xianglong , Ye, Fan , Yuan, Tao , Wang, Jingdong et al. Atomic scale understanding of the defects process in concurrent recrystallization and precipitation of Sm-Co-Fe-Cu-Zr alloys . | Acta Materialia , 2021 , 202 , 290-301 .
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Significantly enhanced energy density and breakdown strength of polymer nanocomposites using highly textured [111]c BaTiO3 platelets EI SCIE
期刊论文 | 2021 , 887 | JOURNAL OF ALLOYS AND COMPOUNDS
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Polymer-based dielectric films are considered as most promising materials for pulsed power capacitors due to their ultra-high power density and current density, fast discharging speed, excellent cycle lifetime and so on. However, the relatively low energy density and efficiency limit their applications in modern electronics and electrical power systems. Here we demonstrate a remarkable improvement in the breakdown strength and energy density of [111]c-BaTiO3 (BT) textured ceramic platelets synthesized in a poly(vinylidene fluoride-hexafluoropropylene) (P(VDF-HFP)) matrix. The breakdown strength of 1.0 wt% BT/P(VDF-HFP) composite films is 130 MV/m higher than that of pristine poly(vinylidene fluoride-hexafluoropropylene) films. The highest energy density of 19.5 J/cm(3) and discharged energy density of 10.6 J/cm(3) are achieved under an electric field of 480 MV/m in the 1.0 wt% BT/P(VDF-HFP) composite films. Fatigue experimental results show that the energy density and efficiency enhanced with the increase of cycles. This study pro-vides a new paradigm to develop the polymer composites with high breakdown strength and energy density, which has great potential for flexible electrical energy storage applications. (C) 2021 Published by Elsevier B.V.

Keyword :

2D filler Dielectric composites Energy storage Breakdown strength Electrical properties

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GB/T 7714 Liu, Jingjing , Dai, Zhonghua , Xie, Jinglong et al. Significantly enhanced energy density and breakdown strength of polymer nanocomposites using highly textured [111]c BaTiO3 platelets [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2021 , 887 .
MLA Liu, Jingjing et al. "Significantly enhanced energy density and breakdown strength of polymer nanocomposites using highly textured [111]c BaTiO3 platelets" . | JOURNAL OF ALLOYS AND COMPOUNDS 887 (2021) .
APA Liu, Jingjing , Dai, Zhonghua , Xie, Jinglong , Zhou, Shun , Liu, Weiguo , Wang, Xi et al. Significantly enhanced energy density and breakdown strength of polymer nanocomposites using highly textured [111]c BaTiO3 platelets . | JOURNAL OF ALLOYS AND COMPOUNDS , 2021 , 887 .
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Existence of a quadruple point in a binary ferroelectric phase diagram EI SCIE
期刊论文 | 2021 , 103 (8) | Physical Review B
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In experimentally measured temperature-composition ferroelectric phase diagrams of BaTiO3-based binary systems, a quadruple point where cubic (C), tetragonal (T), orthorhombic (O), and rhombohedral (R) phases converge has been frequently reported in previous work. More interestingly, the quadruple points are experimentally found to behave as a critical point with large enhancement in properties. However, it has remained a fundamental question as to whether a quadruple point in a binary ferroelectric system defies the thermodynamic phase rule and whether such a point necessarily goes critical. In this study, it is demonstrated by Landau theory that a C-T-O-R quadruple point in a binary ferroelectric system can only exist in the form of a unique type of critical point at which two first-order transition lines and two second-order ones meet, and such critical quadruple points do not defy the thermodynamic phase rule. It is further shown that at such a critical C-T-O-R quadruple point, the system exhibits infinitely large piezoelectric coefficients, which agrees with the high piezoelectricity observed at the C-T-O-R quadruple point in a number of BaTiO3-based binary ferroelectric systems and also helps to explain the large piezoelectricity obtained at the morphotropic phase boundaries of these quadruple point based systems. © 2021 American Physical Society.

Keyword :

Phase transitions Piezoelectricity Barium titanate Ferroelectricity Binary mixtures Piezoelectric devices Crystallography Phase diagrams

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GB/T 7714 Ke, Xiaoqin , Yang, Sen , Wang, Yu et al. Existence of a quadruple point in a binary ferroelectric phase diagram [J]. | Physical Review B , 2021 , 103 (8) .
MLA Ke, Xiaoqin et al. "Existence of a quadruple point in a binary ferroelectric phase diagram" . | Physical Review B 103 . 8 (2021) .
APA Ke, Xiaoqin , Yang, Sen , Wang, Yu , Wang, Dong , Zhao, Luo , Gao, Jinghui et al. Existence of a quadruple point in a binary ferroelectric phase diagram . | Physical Review B , 2021 , 103 (8) .
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Designed morphotropic relaxor boundary ceramic exhibiting large electrostrain and negligible hysteresis EI SCIE
期刊论文 | 2021 , 208 | Acta Materialia
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Electromechanical materials with large electrostrain and low hysteresis are strongly desired for high-precision actuator applications. Despite extensive studies for more than half a century, it is still a challenge to obtain large electrostrain and low hysteresis simultaneously due to the so-called strain-hysteresis trade-off. Here, we report a mechanism to overcome this trade-off: a ceramic composition locating at a morphotropic relaxor boundary (MRB), exhibits enhanced electrostrain and reduced hysteresis as compared with off-MRB compositions. The MRB, a composition-induced boundary separating two relaxors with different local polar symmetries, is attained by transforming an morphotropic phase boundary (MPB) in Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-xPT) through doping lanthanum. The performances of large electrostrain of 0.227% and negligible hysteresis of 3% of MRB composition are the best, as evidenced by occupying a virgin region in the strain-hysteresis chart of relaxor electromechanical ceramics. Moreover, this MRB ceramic maintains the large electrostrain and low hysteresis over a temperature range from 35 to -35 °C. The understanding of abnormal effects of MRB is established through combining microstructure observations and Landau theory analysis: the MRB composition with morphotropic nanodomain structure and higher degree of local structural heterogeneity shows a flatter energy profile with much lower energy barrier, thereby leading to a large electrostrain and negligible hysteresis. Our work demonstrates that the MRB is an effective mechanism to design relaxor materials with large electrostrain and low hysteresis simultaneously. We predict that more high-performance MRB electromechanical materials will be found in properly doped MPB systems. © 2021 Acta Materialia Inc.

Keyword :

Hysteresis Economic and social effects

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GB/T 7714 Yang, Yang , Liu, Chang , Ji, Yuanchao et al. Designed morphotropic relaxor boundary ceramic exhibiting large electrostrain and negligible hysteresis [J]. | Acta Materialia , 2021 , 208 .
MLA Yang, Yang et al. "Designed morphotropic relaxor boundary ceramic exhibiting large electrostrain and negligible hysteresis" . | Acta Materialia 208 (2021) .
APA Yang, Yang , Liu, Chang , Ji, Yuanchao , He, Liqiang , Ren, Xiaobing . Designed morphotropic relaxor boundary ceramic exhibiting large electrostrain and negligible hysteresis . | Acta Materialia , 2021 , 208 .
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