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学者姓名：卢秉恒
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Abstract ：
High-entropy alloys (HEAs) are considered alternatives to traditional structural materials because of their superior mechanical, physical, and chemical properties. However, alloy composition combinations are too numerous to explore. Finding a rapid synthesis method to accelerate the development of HEA bulks is imperative. Existing in situ synthesis methods based on additive manufacturing are insufficient for efficiently controlling the uniformity and accuracy of components. In this work, laser powder bed fusion (L-PBF) is adopted for the in situ synthesis of equiatomic CoCrFeMnNi HEA from elemental powder mixtures. High composition accuracy is achieved in parallel with ensuring internal density. The L-PBF-based process parameters are optimized; and two different methods, namely, a multi-melting process and homogenization heat treatment, are adopted to address the problem of incompletely melted Cr particles in the single-melted samples. X-ray diffraction indicates that HEA microstructure can be obtained from elemental powders via L-PBF. In the triple-melted samples, a strong crystallographic texture can be observed through electron backscatter diffraction, with a maximum polar density of 9.92 and a high ultimate tensile strength (UTS) of (735.3 +/- 14.1) MPa. The homogenization heat-treated samples appear more like coarse equiaxed grains, with a UTS of (650.8 +/- 16.1) MPa and an elongation of (40.2% +/- 1.3%). Cellular substructures are also observed in the triple-melted samples, but not in the homogenization heat-treated samples. The differences in mechanical properties primarily originate from the changes in strengthening mechanism. The even and flat fractographic morphologies of the homogenization heat-treated samples represent a more uniform internal microstructure that is different from the complex morphologies of the triple-melted samples. Relative to the multi-melted samples, the homogenization heat-treated samples exhibit better processability, with a smaller composition deviation, i.e., <= 0.32 at.%. The two methods presented in this study are expected to have considerable potential for developing HEAs with high composition accuracy and composition flexibility.
Keyword ：
heat treatment high-entropy alloys in situ alloying laser powder bed fusion (L-PBF) rapid synthesis
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| GB/T 7714 | Wang, Bowen , Lu, Bingheng , Zhang, Lijuan et al. Rapid in situ alloying of CoCrFeMnNi high-entropy alloy from elemental feedstock toward high-throughput synthesis via laser powder bed fusion [J]. | FRONTIERS OF MECHANICAL ENGINEERING , 2023 , 18 (1) . |
| MLA | Wang, Bowen et al. "Rapid in situ alloying of CoCrFeMnNi high-entropy alloy from elemental feedstock toward high-throughput synthesis via laser powder bed fusion" . | FRONTIERS OF MECHANICAL ENGINEERING 18 . 1 (2023) . |
| APA | Wang, Bowen , Lu, Bingheng , Zhang, Lijuan , Zhang, Jianxun , Li, Bobo , Ji, Qianyu et al. Rapid in situ alloying of CoCrFeMnNi high-entropy alloy from elemental feedstock toward high-throughput synthesis via laser powder bed fusion . | FRONTIERS OF MECHANICAL ENGINEERING , 2023 , 18 (1) . |
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Abstract ：
Gel-based ionic conductors are promising candidates for flexible electronics, serving as stretchable sensors or electrodes. However, most of them suffer from a short operating life, low conductivity and rely on an external power supply, limiting their practical application. Herein, we report a stable organogel ionic conductor with high conductivity and self-powering ability. Briefly, lithium trifluoromethanesulfonate, as a conductive salt, provides high conductivity and the poly(1,1difluoroethylene) layers, as a self-powering system, supply stable energy output under the influence of pressure. Moreover, the proposed conductors withstand long-term and multi-cycle durability tests. The prepared auxiliary training device can withstand the impact of a basketball and detect the impact force, showing potential in passive sensing during practical applications.
Keyword ：
organogel pressure sensing self-powered stable
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| GB/T 7714 | Wang, Li , Wang, Zhengduo , Li, Yingtao et al. An Ionically Conductive, Self-Powered and Stable Organogel for Pressure Sensing [J]. | NANOMATERIALS , 2022 , 12 (4) . |
| MLA | Wang, Li et al. "An Ionically Conductive, Self-Powered and Stable Organogel for Pressure Sensing" . | NANOMATERIALS 12 . 4 (2022) . |
| APA | Wang, Li , Wang, Zhengduo , Li, Yingtao , Luo, Yu , Lu, Bingheng , Gao, Yiyang et al. An Ionically Conductive, Self-Powered and Stable Organogel for Pressure Sensing . | NANOMATERIALS , 2022 , 12 (4) . |
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Abstract ：
We report on a free-standing 3D-printed Si/PEDOT:PSS/PEG electrode based on silicon nanoparticles (Si) as an active material for lithium-ion batteries (LIBs) that are fabricated by 3D printing via digital light processing (DLP). Compared with the Si electrode prepared by the traditional method, the 3D-printed Si/PEDOT:PSS/PEG electrode developed by DLP preserves a specific discharge capacity of 1658.4 mA h g(-1), with a capacity fade of 0.3% per cycle at a current density of 800 mA g(-1) after 125 cycles. This helps in maintaining its structural integrity and enables it to exhibit significantly high flexibility with an enhanced load of 4.2 mg cm(-2). The resulting free-standing electrode shows that 3D printing has significant potential for application to a variety of LIB technologies.
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| GB/T 7714 | Ye, Xinliang , Wang, Chong , Wang, Li et al. DLP printing of a flexible micropattern Si/PEDOT:PSS/PEG electrode for lithium-ion batteries [J]. | CHEMICAL COMMUNICATIONS , 2022 , 58 (55) : 7642-7645 . |
| MLA | Ye, Xinliang et al. "DLP printing of a flexible micropattern Si/PEDOT:PSS/PEG electrode for lithium-ion batteries" . | CHEMICAL COMMUNICATIONS 58 . 55 (2022) : 7642-7645 . |
| APA | Ye, Xinliang , Wang, Chong , Wang, Li , Lu, Bingheng , Gao, Fangliang , Shao, Dan . DLP printing of a flexible micropattern Si/PEDOT:PSS/PEG electrode for lithium-ion batteries . | CHEMICAL COMMUNICATIONS , 2022 , 58 (55) , 7642-7645 . |
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| GB/T 7714 | Ye, Xinliang , Wang, Chong , Wang, Li et al. DLP printing of a flexible micropattern Si/PEDOT:PSS/PEG electrode for lithium-ion batteries (vol 58, pg 7642, 2022) [J]. | CHEMICAL COMMUNICATIONS , 2022 , 58 (98) : 13660-13660 . |
| MLA | Ye, Xinliang et al. "DLP printing of a flexible micropattern Si/PEDOT:PSS/PEG electrode for lithium-ion batteries (vol 58, pg 7642, 2022)" . | CHEMICAL COMMUNICATIONS 58 . 98 (2022) : 13660-13660 . |
| APA | Ye, Xinliang , Wang, Chong , Wang, Li , Lu, Bingheng , Gao, Fangliang , Shao, Dan . DLP printing of a flexible micropattern Si/PEDOT:PSS/PEG electrode for lithium-ion batteries (vol 58, pg 7642, 2022) . | CHEMICAL COMMUNICATIONS , 2022 , 58 (98) , 13660-13660 . |
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Abstract ：
Graphene is an upcoming field emission material. However, graphene based thin film devices are prone to irreversible damage, and the stability for long-term operation is poor. In this study, bulk graphene emitter has been proposed for the first time. The emitter was generated by cold pressing using high quality graphene. The novel bulk emitter exhibited an outstanding field emission performance with the turn-on electric field (at 100 mu A/cm(2)) and threshold electric field (at 10 mA/cm(2)) values determined to be 0.73 V/mu m and 1.09 V/mu m, respectively, along with a maximum current density of 715.51 mA/cm(2). Besides, a stable emission of 209.78 mA/cm(2) was obtained continuously for over 60 h. The self-compensation electron emission mechanism of bulk graphene was proposed based on the morphological changes and simulation results.
Keyword ：
Bulk graphene Cold pressing Field emission Self-compensation effect
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| GB/T 7714 | Ji, Qianyu , Wang, Bowen , Zheng, Yajuan et al. Field emission performance of bulk graphene [J]. | DIAMOND AND RELATED MATERIALS , 2022 , 124 . |
| MLA | Ji, Qianyu et al. "Field emission performance of bulk graphene" . | DIAMOND AND RELATED MATERIALS 124 (2022) . |
| APA | Ji, Qianyu , Wang, Bowen , Zheng, Yajuan , Zeng, Fanguang , Lu, Bingheng . Field emission performance of bulk graphene . | DIAMOND AND RELATED MATERIALS , 2022 , 124 . |
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Abstract ：
The study aimed to evaluate the effectiveness of blood pool and myocardial models made by stereolithography in the diagnosis of different types of congenital heart disease (CHD). Two modeling methods were applied in the diagnosis of 8 cases, and two control groups consisting of experts and students diagnosed the cases using echocardiography with computed tomography, blood pool models, and myocardial models. The importance, suitability, and simulation degree of different models were analyzed. The average diagnostic rate before and after 3D printing was used was 88.75% and 95.9% (P = 0.001) in the expert group and 60% and 91.6% (P = 0.000) in the student group, respectively. 3D printing was considered to be more important for the diagnosis of complex CHDs (very important; average, 87.8%) than simple CHDs (very important; average, 30.8%) (P = 0.000). Myocardial models were considered most realistic regarding the structure of the heart (average, 92.5%). In cases of congenital corrected transposition of great arteries, Williams syndrome, coronary artery fistula, tetralogy of Fallot, patent ductus arteriosus, and coarctation of the aorta, blood pool models were considered more effective (average, 92.1%), while in cases of double outlet right ventricle and ventricular septal defect, myocardial models were considered optimal (average, 80%).
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| GB/T 7714 | Liang, Jixiang , Zhao, Xin , Pan, Guangyu et al. Comparison of blood pool and myocardial 3D printing in the diagnosis of types of congenital heart disease [J]. | SCIENTIFIC REPORTS , 2022 , 12 (1) . |
| MLA | Liang, Jixiang et al. "Comparison of blood pool and myocardial 3D printing in the diagnosis of types of congenital heart disease" . | SCIENTIFIC REPORTS 12 . 1 (2022) . |
| APA | Liang, Jixiang , Zhao, Xin , Pan, Guangyu , Zhang, Gen , Zhao, Dianjiang , Xu, Jianping et al. Comparison of blood pool and myocardial 3D printing in the diagnosis of types of congenital heart disease . | SCIENTIFIC REPORTS , 2022 , 12 (1) . |
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Abstract ：
The process of bone tissue repair and regeneration must occur in a suitable electrical microenvironment, which is one of the most important microenvironments. Electroactive materials appropriately simulate the bioelectric nature of bone and provide the electrical microenvironment required for bone repair, which accelerates bone repair and regeneration. The concept of electrical stimulation-induced osteogenesis promotes the development of electroactive materials as orthopedic implants. This article reviews the general bioelectric phenomena in organisms and the electrical response of natural bone, and briefly explains the promotion of bone regeneration by the electrical microenvironment. Electroactive materials in the field of bone tissue engineering are divided into two categories, such as piezoelectric polymers and conductive polymers, and the material properties, research progress, and applications of each will be described in detail. This article analyzes the limitations of piezoelectric and conductive materials for constructing an electrical microenvironment, reveals the potential of these two materials for overcoming the application limitations of a single type of electroactive material, and discusses the principles. The future challenges and developmental prospects of electroactive materials are discussed. This review comprehensively emphasizes the important characteristics of electroactive biomaterials and points out the direction of development for composite applications of different electroactive materials.
Keyword ：
Bone tissue engineering composite materials conductive polymers electrical stimulation electroactive polymers piezoelectric polymers
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| GB/T 7714 | Jin, Zhengyang , Lu, Bingheng , Xu, Yan . Constructing an electrical microenvironment based on electroactive polymers in the field of bone tissue engineering [J]. | INTERNATIONAL JOURNAL OF POLYMERIC MATERIALS AND POLYMERIC BIOMATERIALS , 2022 . |
| MLA | Jin, Zhengyang et al. "Constructing an electrical microenvironment based on electroactive polymers in the field of bone tissue engineering" . | INTERNATIONAL JOURNAL OF POLYMERIC MATERIALS AND POLYMERIC BIOMATERIALS (2022) . |
| APA | Jin, Zhengyang , Lu, Bingheng , Xu, Yan . Constructing an electrical microenvironment based on electroactive polymers in the field of bone tissue engineering . | INTERNATIONAL JOURNAL OF POLYMERIC MATERIALS AND POLYMERIC BIOMATERIALS , 2022 . |
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Abstract ：
This paper presents an electric-pulse powered additive manufacturing (EPPAM) of metallic glass ribbons, which can be implemented under lower pressure. By this method, Fe73.5Cu1Nb3Si13.5B9 amorphous ribbons, 25 mu m thick, can be formed into various geometries. The formed samples were put to a series of tests and measurement, including X-ray diffraction, differential scanning calorimetry, and transmission electron microscopy. The results and analyses indicate that a good amorphous structure is retained and a high tensile strength is achieved in the bonding part. Without needing crucial atmospheric conditions, such as vacuum or inert gas, this EPPAM can be applied to 3D printing of special-shaped amorphous components, e.g., those used in electromagnetic shielding devices.
Keyword ：
3D printing Additive manufacturing Amorphous material Electric-pulse heating Metallic glass ribbon
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| GB/T 7714 | Li, Bobo , Zhu, Greg , Liu, Jingchi et al. Electric pulse 3D printing of metallic glass ribbons [J]. | MATERIALS LETTERS , 2022 , 316 . |
| MLA | Li, Bobo et al. "Electric pulse 3D printing of metallic glass ribbons" . | MATERIALS LETTERS 316 (2022) . |
| APA | Li, Bobo , Zhu, Greg , Liu, Jingchi , Zhao, Shaofan , Wang, Bowen , Wei, Pei et al. Electric pulse 3D printing of metallic glass ribbons . | MATERIALS LETTERS , 2022 , 316 . |
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Abstract ：
增材制造技术被称为新工业革命的标志性技术,立体光刻在能源器件、加工材料、制造方案的迭代中,发展出多种高分子材料快速成形技术方案.作为制造技术关键评价的速度、精度指标,始终引领着宏微观尺度光固化增材制造技术发展方向,推动形成崭新的技术方案.光固化增材制造技术由早期的激光点扫描成形,逐步发展出面制造、体制造.文中通过分析近5年来国内外高速高精光固化前沿文献,讨论了7种方法的技术原理、关键器件能力限制、创新特点和其面临的工程应用问题,包括体成型技术:计算轴向光刻技术和激光全息投影技术;面成型技术:连续液面生长技术、双波长光源直写光刻技术、高速大尺寸技术、飞秒投影双光子光刻微纳技术、双紫外臭氧动态掩模技术.并比较了这7种技术的科学依据技术原理与工程问题,揭示该技术的迭代演化规律和潜在应用场景.
Keyword ：
成型新方法 高速高精 光固化 前沿进展 增材制造
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| GB/T 7714 | 宗学文 , 张佳亮 , 周升栋 et al. 高速高精光固化增材制造技术前沿进展 [J]. | 西安科技大学学报 , 2021 , 41 (1) : 128-138 . |
| MLA | 宗学文 et al. "高速高精光固化增材制造技术前沿进展" . | 西安科技大学学报 41 . 1 (2021) : 128-138 . |
| APA | 宗学文 , 张佳亮 , 周升栋 , 闫丹 , 倪铭佑 , 李素丽 et al. 高速高精光固化增材制造技术前沿进展 . | 西安科技大学学报 , 2021 , 41 (1) , 128-138 . |
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Abstract ：
提出采用展成圆代替插补圆的原理设计了特殊的主轴结构,实现孔的以铣代镗加工工艺,并进行了实验验证.采用正交方法进行切削实验设计,分析不同工艺参数对孔特征精度(尺寸精度、圆度、孔壁粗糙度)的影响,验证以铣代镗加工孔的可行性,并研究得出影响孔特征精度的主要工艺参数.结果发现,在铣代镗孔加工过程中,影响孔特征精度(尺寸精度、圆度)最大的因素为轴向进给速度,其次主轴转速;而影响孔特征精度(孔壁粗糙度)最大的因素为主轴转速.最后,选取某汽车变速箱壳体类零件加工为案例进行实际验证,分别对比以铣代镗加工与镗削加工,相比较采用镗削方式加工,以铣代镗加工能够节省加工刀具成本,提高加工效率.实验结果对于先进孔加工工艺研究具有重要的参考价值.
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| GB/T 7714 | 王磊 , 张琼 , 汤永凯 et al. 以铣代镗工艺研究 [J]. | 制造技术与机床 , 2021 , (9) : 69-74 . |
| MLA | 王磊 et al. "以铣代镗工艺研究" . | 制造技术与机床 9 (2021) : 69-74 . |
| APA | 王磊 , 张琼 , 汤永凯 , 卢秉恒 . 以铣代镗工艺研究 . | 制造技术与机床 , 2021 , (9) , 69-74 . |
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