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学者姓名：任晓兵
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Abstract ：
Acceptor doping is effective in enhancing thermal stability in piezoceramics, while the reason underlying is still unclear and awaits explanation. In this work, through doping acceptor Mn in lead-free Ba(Ti0.8Zr0.2)O-3-50 (Ba0.7Ca0.3)TiO3 ceramic, our results show that doping Mn achieves higher depolarization temperature, even higher than Curie temperature (TC) and simultaneously a better piezoelectric thermal stability. Through microscopic and macroscopic analysis, the enhancement can be explained by the clamping effect induced by acceptor doping, which is carefully demonstrated by symmetry-conforming short-range ordering tendency theory. Thus, this work reveals the mechanism for enhanced depolarization temperature and piezoelectric thermal stability due to acceptor doping and will help developing new thermal stable lead-free piezoceramics applicable in a wider temperature range.
Keyword ：
Acceptor doping Clamping effect Lead-free Piezoelectricity Thermal stability
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| GB/T 7714 | Yin, Mengye , Fang, Minxia , Zhang, Lixue et al. Microscopic origin of the enhanced piezoelectric thermal stability in acceptor doped lead-free Ba(Ti0.8Zr0.2)O-3-50(Ba0.7Ca0.3)TiO3 ceramic [J]. | CERAMICS INTERNATIONAL , 2022 , 48 (4) : 5274-5279 . |
| MLA | Yin, Mengye et al. "Microscopic origin of the enhanced piezoelectric thermal stability in acceptor doped lead-free Ba(Ti0.8Zr0.2)O-3-50(Ba0.7Ca0.3)TiO3 ceramic" . | CERAMICS INTERNATIONAL 48 . 4 (2022) : 5274-5279 . |
| APA | Yin, Mengye , Fang, Minxia , Zhang, Lixue , Zhou, Chao , Xiao, Andong , Ji, Yuanchao et al. Microscopic origin of the enhanced piezoelectric thermal stability in acceptor doped lead-free Ba(Ti0.8Zr0.2)O-3-50(Ba0.7Ca0.3)TiO3 ceramic . | CERAMICS INTERNATIONAL , 2022 , 48 (4) , 5274-5279 . |
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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 Glass Glass transition Iron alloys Martensite Martensitic transformations Nanotechnology Niobium alloys Shape-memory alloy Titanium alloys Zircaloy
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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 , 2022 , 907 . |
| MLA | Xiong, Chengyang et al. "Superelasticity over a wide temperature range in metastable β-Ti shape memory alloys" . | Journal of Alloys and Compounds 907 (2022) . |
| 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 , 2022 , 907 . |
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Abstract ：
Strain glasses (STGs), which are characterized by nanodomains of martensite formed via a strain glass transition, can produce many unusual properties not possessed by normal martensitic alloys. These nanodomains originate from the formation of short-range strain ordering by the disruption of otherwise long-range strain ordering or normal martensitic transformation through sufficient atomic/nanoscale random stress/strain field. So far the atomic/nanoscale randomness is known to be from either point defects, dislocations, or nanoprecipitates. Here we report a spinodal STG alloy Mn60Cu40, which stems from nanoscale composition modulations (5-20 nm) formed in the early stage of spinodal decomposition, which is identified by STEM-EDS and HRTEM. For short-time ( < 50 min) aged sample, a strain glass transition was identified by its typical signatures including invariance of global face-centered cubic (fcc) structure with cooling, frequency dependence of elastic moduli at STG transition temperature (T-g) following a Vogel-Fulcher relationship, non-ergodicity as manifested by zero-field-colling/field-cooling curves, and the formation of martensitic face-centered tetragonal (fct) nanodomains. For long-time (>= 50 min) aged sample, a normal martensitic transition from fcc to fct appears with cooling, being consistent with literatures. As the result, a temperature vs. aging-time phase diagram of spinodal STG was established and shows a crossover from STG to martensite above a critical aging time. The spinodal STG exhibits a non-magnetic Elinvar behavior, i.e., nearly constant elastic modulus over a wide temperature range, together with high-damping capacity. We anticipate that the spinodal STG and associated novel properties may also be found in other metallic and ceramic spinodal materials. (C) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Keyword ：
Elinvar Mn-Cu alloy spinodal decomposition Strain glass
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| GB/T 7714 | Wang, Wenjia , Luo, Pu , Wei, Ying et al. Spinodal strain glass in Mn-Cu alloys [J]. | ACTA MATERIALIA , 2022 , 231 . |
| MLA | Wang, Wenjia et al. "Spinodal strain glass in Mn-Cu alloys" . | ACTA MATERIALIA 231 (2022) . |
| APA | Wang, Wenjia , Luo, Pu , Wei, Ying , Ji, Yuanchao , Liu, Chang , Ren, Xiaobing . Spinodal strain glass in Mn-Cu alloys . | ACTA MATERIALIA , 2022 , 231 . |
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Abstract ：
Dielectric ceramics with a high recoverable energy density (W-rec) and high efficiency are desirable for the development of pulsed power capacitors under low electric fields. In this study, through the introduction of SrSc0.5Nb0.5O3 into (Bi0.5Na0.5Ti0.95Al0.025Nb0.025O3) [(1-x)BNTA-xSSN], a considerable recoverable energy storage density (W-rec) of approximately 2.7 J/cm(3) and energy storage efficiency (eta) of approximately 76 % at 210 kV/cm are achieved at x = .1; additionally, eta is further improved to 85 % at x = .2. Moreover, eta and W-rec of .9BNTA-.1SSN exhibit outstanding stability (thermal and frequency stability) at 150 kV/cm, which is superior to that of other lead-free ceramics. The excellent energy storage performance is attributed to the increased relaxation degree and the formation of ferroelectric nanodomains, whereas the enhanced E-b is ascribed to the increased electrical resistivity and decreased grain size upon modification. These results indicate the potential of (1-x)BNTA-xSSN as an ideal candidate for energy-storage applications.
Keyword ：
ceramic energy storage density energy storage efficiency relaxor ferroelectrics
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| GB/T 7714 | Dai, Zhonghua , Wang, Shengbin , Liu, Yong et al. Energy storage performance of SrSc0.5Nb0.5O3 modified (Bi,Na)TiO3-based ceramic under low electric fields [J]. | JOURNAL OF THE AMERICAN CERAMIC SOCIETY , 2022 , 106 (4) : 2366-2374 . |
| MLA | Dai, Zhonghua et al. "Energy storage performance of SrSc0.5Nb0.5O3 modified (Bi,Na)TiO3-based ceramic under low electric fields" . | JOURNAL OF THE AMERICAN CERAMIC SOCIETY 106 . 4 (2022) : 2366-2374 . |
| APA | Dai, Zhonghua , Wang, Shengbin , Liu, Yong , Zhang, Fanbo , Liu, Weiguo , Zhao, Xin et al. Energy storage performance of SrSc0.5Nb0.5O3 modified (Bi,Na)TiO3-based ceramic under low electric fields . | JOURNAL OF THE AMERICAN CERAMIC SOCIETY , 2022 , 106 (4) , 2366-2374 . |
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Abstract ：
铁磁应变玻璃是近年来在掺杂缺陷的Ni-Mn-Ga,Fe-Pd和Fe-Ni-Cr等铁磁马氏体合金体系中发现的新玻璃现象,其本质是短程晶格应变有序和长程磁有序共存的冻结态.铁磁应变玻璃的基本结构单元是磁性纳米马氏体畴,具有转动能垒小的特点;它们在母相基体中缓慢生长、跨越很宽温区,且母相基体和纳米畴的模量随温度呈现相反的变化趋势,这些特性可导致低场驱动大磁致伸缩效应和Elinvar效应,在微型驱动传感器和精密机械中有重要应用价值.本文主要介绍了铁磁应变玻璃的宏观物理性质、微观结构特征以及功能特性;通过Ni-X-Mn-Ga(X=Co,Fe)体系的相图,阐明了铁磁应变玻璃的形成过程,以及它与马氏体相、预马氏体相的关系.此外,本文还介绍了在铁磁马氏体/铁磁应变玻璃相界区出现的奇异相变行为——铁磁应变玻璃的自发马氏体相变.基于铁磁应变玻璃的材料设计,有望为磁性材料的性能突破和功能开发带来新机遇.
Keyword ：
Elinvar效应 磁致伸缩效应 马氏体相变 铁磁形状记忆合金 铁磁应变玻璃
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| GB/T 7714 | 王宇 , 任帅 , 杨森 et al. 铁磁应变玻璃及其物理特性 [J]. | 中国科学（物理学 力学 天文学） , 2021 , 51 (6) : 90-99 . |
| MLA | 王宇 et al. "铁磁应变玻璃及其物理特性" . | 中国科学（物理学 力学 天文学） 51 . 6 (2021) : 90-99 . |
| APA | 王宇 , 任帅 , 杨森 , 任晓兵 . 铁磁应变玻璃及其物理特性 . | 中国科学（物理学 力学 天文学） , 2021 , 51 (6) , 90-99 . |
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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 ：
Aging Lead-free Piezoelectric Thermal cycling stability
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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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Abstract ：
The precision control of thermal expansion is of fundamental interest and desirable for applications that require materials to retain their shape at different temperatures. In the present study, we propose that the thermal expansion coefficient can be tuned by uniaxial external stress for a single material embedded with nanoclusters, if the formation, growth or alignment of the nanoclusters depends on the external stress. We demonstrate the idea in a prototype alloy (Ti50(Pd40Cr10)) located at the compositional crossover region between martensite and strain glass in the temperature-composition phase diagram of Ti50(Pd50−xCrx). Its thermal expansion coefficient varies linearly from positive, through zero to negative values with increasing uniaxial tensile stress within 200 K ~ 300 K. The phase field simulations show that the volume fraction of nanoscale martensite variant favored by the external stress increases with stress, producing extra strain and compensating for the contraction of the austenite matrix on cooling. The degree of compensation leads to different thermal expansion coefficients. Such a tunable thermal expansion behavior occurs only in the crossover compositions between martensite and strain glass, providing a design recipe for searching new systems with similar behavior. © 2020 The Authors
Keyword ：
Expansion Glass Martensite Nanoclusters Negative thermal expansion Tensile stress Thermal expansion
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| GB/T 7714 | Zhou, Yumei , Yuan, Ruihao , Xue, Dezhen et al. Tailoring thermal expansion coefficient from positive through zero to negative in the compositional crossover alloy Ti50(Pd40Cr10) by uniaxial tensile stress [J]. | Materials and Design , 2021 , 199 . |
| MLA | Zhou, Yumei et al. "Tailoring thermal expansion coefficient from positive through zero to negative in the compositional crossover alloy Ti50(Pd40Cr10) by uniaxial tensile stress" . | Materials and Design 199 (2021) . |
| APA | Zhou, Yumei , Yuan, Ruihao , Xue, Dezhen , Wang, Dong , Ding, Xiangdong , Ren, Xiaobing et al. Tailoring thermal expansion coefficient from positive through zero to negative in the compositional crossover alloy Ti50(Pd40Cr10) by uniaxial tensile stress . | Materials and Design , 2021 , 199 . |
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Abstract ：
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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Abstract ：
Magnetostrictive materials with large magnetostriction, low hysteresis and wide working temperature range are desired for applications, but rarely obtained so far. In this work, we report a surprising finding in (1-x)TbFe2-xDyCo(2) alloys: the composition of x = 0.5 exhibits a low hysteretic magnetostriction, lambda(parallel to,max) similar to 2066 ppm, which is 1.59 times as large as that of the commercial giant magnetostrictive alloy of Terfenol-D, lambda(parallel to,max) similar to 1298 ppm. Moreover, its temperature range for lambda(parallel to) > 1298 ppm is even larger than 240 K, and another working temperature window for lambda(parallel to) > 10 0 0 ppm is from 40 K to 324 K, which can cover a large temperature fluctuation in space environments (e.g. 120-290 K in Mars). The established phase diagram of (1-x)TbFe2-xDyCo(2) by systematic studies of magnetic susceptibility, X-ray diffraction and convergent-beam electron diffraction results, shows an emergence of morphotropic phase boundary (MPB) between rhombohedral (R) and orthorhombic (O) ferromagnetic phases, which is different from the MPB between R and T (tetragonal) phases in (1-y)TbFe2-yDyFe(2). We reveal that the exceptional combination of giant magnetostriction, low hysteresis and wide working temperature range is caused by this R-O MPB. The comparison between R-O MPB and R-T MPB further shows the O phase plays a vital role in the property enhancement of R-O MPB composition. Our work indicates the construction of R-O MPB may provide a new way to find high-performance magnetostrictive materials. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Keyword ：
Magnetostriction Morphotropic phase boundary Orthorhombic phase R-O MPB Working temperature range
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| GB/T 7714 | Zhao, Hui , Ji, Yuanchao , Ma, Tianyu et al. Exceptional combination of large magnetostriction, low hysteresis and wide working temperature range in (1-x)TbFe2-xDyCo(2) alloys [J]. | ACTA MATERIALIA , 2021 , 220 . |
| MLA | Zhao, Hui et al. "Exceptional combination of large magnetostriction, low hysteresis and wide working temperature range in (1-x)TbFe2-xDyCo(2) alloys" . | ACTA MATERIALIA 220 (2021) . |
| APA | Zhao, Hui , Ji, Yuanchao , Ma, Tianyu , Fang, Minxia , Hao, Yanshuang , Yang, Tianzi et al. Exceptional combination of large magnetostriction, low hysteresis and wide working temperature range in (1-x)TbFe2-xDyCo(2) alloys . | ACTA MATERIALIA , 2021 , 220 . |
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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 ：
Atoms Cells Cobalt alloys Cobalt metallography Copper alloys Copper metallography Cytology Diffusion Dissociation High resolution transmission electron microscopy Iron alloys Iron metallography Point defects Precipitation (chemical) Recrystallization (metallurgy) Samarium alloys Zircaloy Zirconium 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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