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Analysis of interaction between dislocation and interface of aluminum matrix/second phase from electronic behavior

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Journal of Materials Science & Technology 2023年第5期136卷 78-90页

作者： Qianxing Yin Guoqing Chen Xi Shu Binggang Zhang Chun Li Zhibo Dong Jian Cao Rong An yongxian huang State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

The inhibitory effect of the second phase on dislocation movement has long been deemed as a great con-tribution to the strengthening of alloys.We investigate the electronic behavior at theα-Al matrix/second phase interface to explore its inhibitory effect on dislocation movement.This work focuses on the dif-ficulty in dislocation movement on the interface ofα-Al/Al_(3)Sc,α-Al/θ’(Al_(2)Cu),andα-Al/T_(1)(Al_(2)CuLi)of aluminum-lithium-scandium alloy based on detailed transmission electron microscopy investigation and electron transport calculation.The more drastic the electron transport between two atoms at the inter-face,the more intense the interaction between them,corresponding to the larger difficulty in breaking and forming bonds between them during the movement process of the extra half plane of dislocation on the interface.The calculated difference in density of valence electrons and differential charge density atα-Al/second phase interface reveals that Al_(3)Sc is characterized by the largest resistance to dislocation movement compared toθ’(Al_(2)Cu)and T_(1)(Al_(2)CuLi).The large differential charge density between the in-terface of(100)Al_(3)Sc/(100)Al demonstrates the strong bonds betweenα-Al and Al_(3)Sc and the large difficulty for the extra half plane of dislocation to form or break bonds during the movement process atα-Al/Al_(3)Sc interface.The dislocation pile-up indicates a discernible hindering effect of theα-Al/Al_(3)Sc interface on dislocation movement.The hindering effect presented byα-Al/Al_(3)Sc interface is favorable for the tensile strength.

关键词： Dislocations Microstructural interface Aluminum alloy Electron transport First-principles calculation

Green recycling of short-circuited garnet-type electrolyte for high-performance solid-state lithium batteries

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Journal of Energy Chemistry 2023年第5期80卷 492-500,I0012页

作者： yongxian huang Zhiwei Qin Cheng Shan Yuming Xie Xiangchen Meng Delai Qian Gang He Dongxin Mao Long Wan State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001HeilongjiangChina Zhengzhou Research Institute Harbin Institute of TechnologyZhengzhou 450046HenanChina School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001HeilongjiangChina

Solid-state lithium batteries(SSLBs)solve safety issues and are potentially energy-dense alternatives to next-generation energy storage systems.Battery green recycling routes are responsible for the widespread use of SSLBs due to minimizing environmental contamination,reducing production costs,and providing a sustainable solution for resources,e.g.,saving rare earth elements(La,Ta,etc.).Herein,a solid-state recycling strategy is proposed to achieve green recycling of the crucial component solidstate electrolytes(SSEs)in spent SSLBs.The short-circuited garnet Li_(6.5)La_(3)Zr_(1.5)Ta_(0.5)O_(12)(LLZTO)is broken into fine particles and mixed with fresh particles to improve sintering activity and achieve high packing density.The continuous Li absorption process promotes sufficient grain fusion and guarantees the transformation from tetragonal phase to pure cubic phase for high-performance recycled LLZTO.The Li-ion conductivity reaches 5.80×10^(-4)S cm-1with a relative density of 95.9%.Symmetric Li cell with asrecycled LLZTO shows long-term cycling stability for 700 h at 0.3 mA cm^(-2)without any voltage hysteresis.Full cell exhibits an excellent cycling performance with a discharge capacity of 141.5 mA h g^(-1)and a capacity retention of 92.1%after 400 cycles(0.2C).This work develops an environmentally friendly and economically controllable strategy to recycle SSE from spent SSLBs,guiding future directions of SSLBs large-scale industrial application and green recycling study.

关键词： Solid-state electrolytes Li-garnet Green recycling Solid-state lithium batteries Cycling stability

Towards Friction Stir Remanufacturing of High‑Strength Aluminum Components

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Acta Metallurgica Sinica(English Letters) 2023年第1期36卷 91-102页

作者： Xiangchen Meng Yuming Xie Xiaotian Ma Mingyang Liang Xiaoyang Peng Shiwei Han Lei Kan Xin Wang Sihao Chen yongxian huang State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China Chongqing Tiema Industries Group Co. Ltd.Chongqing 630050China The Sixth Military Representative Ofce of the Army Installment Station in Chongqing Chongqing 400042China Shanghai Spacefight Precision Machinery Institute Shanghai 201600China

Volumetric defects in high-strength aluminum alloy components were repaired via friction stir remanufacturing(FSR).Various consumable pins made of AA7075-T6 were designed.Top diameters of the consumable pins afected material fow,which ensured that the materials at the repairing interface were forged to metallurgical bonding.Conical angles determined load transfer besides material fow,which afected the fracture of the pins before the dwelling stage.Sound repaired components were achieved when the conical angle of the consumable pin was 1°larger than that of the volumetric defect.The ultimate tensile strength and elongation of the repaired components reached 445.9 MPa and 9.6%,respectively.The design criteria of the consumable pin in the FSR was established,which provided valuable references to repair volumetric defects in high-strength aluminum components.

关键词： Aluminum alloy Defects Friction stir welding Interfaces Microstructures Mechanical properties

Mechanical Properties and Microstructure of 6082-T6 Aluminum Alloy Joints by Self-support Friction Stir Welding

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Journal of Materials Science & Technology 2014年第12期30卷 1243-1250页

作者： Long Wan yongxian huang Weiqiang Guo Shixiong Lv Jicai Feng State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology

The majority of this research has concentrated on developing the self-support friction stir welding（SSFSW） tool which consists of a big concave upper shoulder and a small convex lower shoulder, and procedures for making reliable welds in aluminum hollow extrusion. The 5-mm-thick 6082-T6 aluminum alloy was self-support friction stir welded at a constant tool rotation speed of 800 r/min. The effect of welding speed on microstructure and mechanical properties was investigated. The results of transverse tensile test indicated that the tensile strength of joints increased and the elongation decreased with increasing welding speed. The whole values of microhardness of SSFSW joints increased with increasing welding speed from 10 to 200 mm/min. The defectfree joints were obtained at lower welding speeds and the tensile fracture was located at the heat-affected zone（HAZ） adjacent to the thermo-mechanically affected zone（TMAZ） on the advancing side. The investigation of the flow pattern of the softened metal around the SSFSW tool revealed that the flow pattern of the softened metal was driven by two shoulders and the stir pin. The failure of specimens in tension presented the ductile fracture mode.

关键词： Self-support friction stir welding Aluminum alloy Welding speed Mechanical properties Microstructure Flow pattern

Joint formation mechanism of high depth-to-width ratio friction stir welding

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Journal of Materials Science & Technology 2019年第7期35卷 1261-1269页

作者： yongxian huang Yuming Xie Xiangchen Meng Junchen Li Li Zhou State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology

High depth-to-width ratio friction stir welding is an attractive method for the joining demands of alum inum profiles, which is sparked with its extrem ely low heat input and high mechanical performance. In this study, the joint form ation mechanism was studied by a num erical model of plastic flow combined with experim ental approaches. A fluid-solid-interaction algorithm was proposed to establish the coupling model, and the material to be welded was treated as non-New tonian fluid. The thread structure and the milling facets on tool pin prom oted drastic turbulence of material. The thread structure converged the plasticized material by its inclined plane, and then drove the attached material to refill the welds. The milling facets brought about the periodic dynamic material flow. The thread structure and the milling facets increased the strain rate greatly under the extremely low heat input, which avoided the welding defects. The condition of the peak tem perature of 648 K and the strain rate of 151 s^-1 attributed to the lowest coarsening degree of precipitate. The tensile strength of the joint reached 265 MPa, equivalent to 86% of base material. The amelioration via the material flow model inhibits the welding defects and optimizes the param eter intervals, providing references to extracting process-structure-property linkages for friction stir welding.

关键词： Friction stir welding Joint formation Material flow Al-Mg-Si alloy Microstructure Mechanical properties

Effect of Reverse-threaded Pin on Mechanical Properties of Friction Stir Lap Welded Alclad 2024 Aluminum Alloy

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Journal of Materials Science & Technology 2016年第7期32卷 671-675页

作者： Yumei Yue Zhengwei Li Shude Ji yongxian huang Zhenlu Zhou Faculty of Aerospace Engineering. Shenyang Aerospace University Shenyang 110136 China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001 China

In friction stir welding （FSW）, tool geometry plays an important role in joint quality. In order to improve mechanical properties of friction stir lap welding （FSLW）joint, a tool with a reverse-threaded pin was designed in the present study. Using 2024-T4 aluminum alloy as the research object, tools with the full- threaded pin and reverse-threaded pin were used in FSLW. Results showed that, when using the same parameter combination, FSLW joint using the reverse-threaded pin owned bigger effective sheet thick- ness （EST）, bigger lap width and better lap shear failure strength. Compared with the full-threaded pin, fracture mode of the FSLW joint changed from shear fracture mode to tensile fracture mode when the reverse-threaded pin was used. Fracture morphologies presented ductile fracture.

关键词： Friction stir lap weldingReverse-threaded pinHookFracture position

基于改进生成对抗网络场景生成的长-短期储能优化配置

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高电压技术 2024年第3期50卷 1131-1144,I0016-I0020页

作者：王成磊匡熠濮永现唐岚黄力文束洪春昆明理工大学电力工程学院昆明650051 云南电网有限责任公司电力调度控制中心昆明650000 中国电建集团昆明勘测设计研究院有限公司昆明650000

占比不断提高的新能源对新型电力系统的灵活性调节能力提出了新需求。为此,提出了一种长-短期储能优化配置方法,通过短时功率与长期电量的双重调节来保障系统的多时间尺度灵活性调节能力。首先,提出了一种基于改进生成对抗网络的风光联... 详细信息

占比不断提高的新能源对新型电力系统的灵活性调节能力提出了新需求。为此,提出了一种长-短期储能优化配置方法,通过短时功率与长期电量的双重调节来保障系统的多时间尺度灵活性调节能力。首先,提出了一种基于改进生成对抗网络的风光联合出力场景生成方法,通过加入月份标签信息对风光出力的边界进行准确刻画;其次,综合考虑不同类型储能的技术特点,提出一种长-短期储能的运行配合策略;最后,建立了兼顾经济性和灵活性双重目标的长-短期储能配置双层优化模型,通过对上下层模型的不断优化迭代得到最优储能配置方案。以改进的IEEE-RTS 24节点系统为例进行验证,研究结果表明所提方法可有效提升高渗透率电力系统的灵活性与经济性。

关键词：可再生能源不确定性生成对抗网络储能配置运行策略场景生成

Relapse after CAR-T cell therapy in B-cell malignancies: challenges and future approaches

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2022年第10期23卷 793-811页

作者： Tianning GU Meng ZHU He huang yongxian HU Bone Marrow Transplantation Center the First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003China Liangzhu Laboratory Zhejiang University Medical CenterHangzhou 311121China Institute of Hematology Zhejiang UniversityHangzhou 310058China Zhejiang Province Engineering Laboratory for Stem Cell and Immunity Therapy Hangzhou 310058China

Chimeric antigen receptor-T(CAR-T)cell therapy,as a novel cellular immunotherapy,has dramatically reshaped the landscape of cancer treatment,especially in hematological malignancies.However,relapse is still one of the most troublesome obstacles to achieving broad clinical application.The intrinsic factors and superior adaptability of tumor cells mark a fundamental aspect of relapse.The unique biological function of CAR-T cells governed by their special CAR construction also affects treatment efficacy.Moreover,complex cross-interactions among CAR-T cells,tumor cells,and the tumor microenvironment(TME)profoundly influence clinical outcomes concerning CAR-T cell function and persistence.Therefore,in this review,based on the most recent discoveries,we focus on the challenges of relapse after CAR-T cell therapy in B-cell malignancies from the perspective of tumor cells,CAR-T cells,and the TME.We also discuss the corresponding basic and clinical approaches that may overcome the problem in the future.We aim to provide a comprehensive understanding for scientists and physicians that will help improve research and clinical practice.

关键词： Chimeric antigen receptor-T(CAR-T) B-cell malignancies Mechanisms of relapse Strategy

抚仙湖流域典型农田土壤质量状况及烟草种植障碍因素

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土壤 2024年第1期56卷 103-111页

作者：徐勇贤梁强周勇陈志清王火焰黄标云南省烟草公司玉溪市公司澄江分公司云南澄江652500 土壤与农业可持续发展重点实验室(中国科学院) 南京210008 中国科学院大学中丹学院北京100190

以云南抚仙湖北岸澄江市约1130 hm^(2)农田土壤为研究对象,通过调查分析土壤物理、化学性质,评价了研究区土壤质量状况,并进一步利用空间分析、相关分析与主成分分析对研究区烟草种植的主要土壤障碍因子进行了分析。结果表明:研究区土... 详细信息

以云南抚仙湖北岸澄江市约1130 hm^(2)农田土壤为研究对象,通过调查分析土壤物理、化学性质,评价了研究区土壤质量状况,并进一步利用空间分析、相关分析与主成分分析对研究区烟草种植的主要土壤障碍因子进行了分析。结果表明:研究区土壤整体偏黏(平均黏粒含量496.7 g/kg)、偏碱(pH均值7.45)、有机质含量较高(均值28.55 g/kg)、大中微量营养元素有效态含量也整体偏高(水解性氮均值119.10 mg/kg、有效磷均值68.85 mg/kg、速效钾均值208.44 mg/kg、有效锰均值28.14 mg/kg),但各土壤性质在空间上变异较大。土壤基础地力、人为施肥管理、质地、酸碱性、有效锰是影响该地区土壤肥力的主要障碍因素,这些因素可通过有机质、速效钾、黏粒、pH、有效锰等指标进行评价,并指导烟草种植的土壤管理。烟草种植过程中应根据土壤性质、烟草养分需求,结合土壤养分空间变异采取相应的土壤改良措施。

关键词：土壤肥力质量空间变异烟草种植土壤障碍因素