检索结果-南通市图书馆

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

在线全文

学校读者我要写书评

暂无评论

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

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

在线全文

学校读者我要写书评

暂无评论

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

Lightweight Design:Friction‑Based Welding between Metal and Polymer

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2023年第6期36卷 881-898页

作者： Xiangchen Meng Yuming Xie Shuming Sun Xiaotian Ma Long Wan Jian Cao yongxian huang State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China Zhengzhou Research Institute Harbin Institute of TechnologyZhengzhou 450046China

The heterojunctions between metal and polymer have become the effective ways to produce the lighter,safer and more environmental friendly vehicles for the manufacturing fields of automotive and *** state-of-the-art frictionbased welding techniques are characterized by low peak temperature,severe plastic deformation,energy efficiency and nonpollution,which can simultaneously realize the mechanical and chemical bonding,improving mechanical *** this review,the current progress about friction-based welding techniques is summarized,containing technical development,welding tool design,microstructural characteristic,process optimization,surface modification and joining *** conclusions and prospects are presented,which focus on the practical implications for the manufacturing sectors and recommendations for further research and *** purpose of this review is to elucidate the benefits of friction-based welding techniques so that these methods may be better exploited and industrialized.

关键词： Lightweight design Metal and polymer Solid state joining Joining mechanisms Process development

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

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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 *** investigate the electronic behavior at theα-Al matrix/second phase interface to explore its inhibitory effect on dislocation *** 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 *** 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 *** 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 *** dislocation pile-up indicates a discernible hindering effect of theα-Al/Al_(3)Sc interface on dislocation *** 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

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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 *** 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 *** 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 *** continuous Li absorption process promotes sufficient grain fusion and guarantees the transformation from tetragonal phase to pure cubic phase for high-performance recycled *** 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 *** 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

在线全文

学校读者我要写书评

暂无评论

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 *** diameters of the consumable pins afected material fow,which ensured that the materials at the repairing interface were forged to metallurgical *** angles determined load transfer besides material fow,which afected the fracture of the pins before the dwelling *** repaired components were achieved when the conical angle of the consumable pin was 1°larger than that of the volumetric *** ultimate tensile strength and elongation of the repaired components reached 445.9 MPa and 9.6%,*** 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

Enlarged-end tool for friction stir lap welding towards hook defect controlling

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Welding 2020年第1期29卷 1-7页

作者： LüZongliang Han Zhenyu Zhu Dong huang Tifang huang yongxian State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China Shanghai Lingyun Automobile R&D Branch Company Lingyun Industrial Corporation LimitedShanghai 201708China

Hook defect is one of the trickiest issues for friction stir lap welding,which remains to be *** this study,a designed pin with an enlarged-end was proposed to control the interfacial hook defect by optimizing its morphology *** insert aduncous structure at the advancing side is dissected by multilayer metallographic observation,which is the main character to terminate the inner-ward extension of the *** application of this tool was verified practical with a varied plunge depth of pin into the lower plate from 0.1 mm to 1.6 *** angle of the hook was small and terminated at the insert-structure or oriented toward the material convergence *** joint fractured along the hook line and the highest joint efficiency reached 86%of the parent 6082-T4 aluminum alloy.

关键词： friction stir welding welding tool hook defect microstructures mechanical properties

深冷条件下多重旋转碾压超细晶铜的组织与磨损性能

在线全文

学校读者我要写书评

暂无评论

辽宁石油化工大学学报 2024年第2期44卷 50-54页

作者：周华贾南陆亚轩孟祥晨黄永宪河钢工业技术服务有限公司河北廊坊065000 先进焊接与连接国家重点实验室黑龙江哈尔滨150001

通过碾压式搅拌头在深冷条件下对铜板进行多重旋转碾压,采用超景深显微镜、光学显微镜、摩擦磨损仪对碾压后样品的表面形貌、组织和性能进行了分析。结果表明,在深冷条件下多重旋转碾压后,样品表面成形良好,表层出现明显的超细晶区;在... 详细信息

通过碾压式搅拌头在深冷条件下对铜板进行多重旋转碾压,采用超景深显微镜、光学显微镜、摩擦磨损仪对碾压后样品的表面形貌、组织和性能进行了分析。结果表明,在深冷条件下多重旋转碾压后,样品表面成形良好,表层出现明显的超细晶区;在转速为50 r/min时,超细晶成形机制为晶粒的剪切破碎;在转速为500 r/min时,晶粒细化机制为动态再结晶和强制冷却抑制再结晶晶粒的长大;在深冷条件下多重旋转碾压制备的超细晶层可提高材料的耐磨性。

关键词：多重旋转碾压超细晶再结晶机制磨损性能

The influence of gradient mismatches on mechanical properties and microstructure of 2219-T6 aluminum alloy VP-TIG joints

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

China Welding 2017年第4期26卷 20-28页

作者： LüZongliang Li Chong Wan Long Hou Zhenguo Chen Xiaoxia Wu Hao huang yongxian Harbin World Wide Welding Technology Co. Ltd.Harbin150006 CRRC Tangshan Co. Ltd.Tangshan064099 State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin150001

In this paper,6 mm thick 2219-T6 aluminum alloy was joined by means of variable polarity tungsten-arc welding( VP-TIG) and the influence of gradient mismatches on VP-TIG joints is investigated. The average tensile strength of the joints reduces 32%,53% and 59%,when the mismatch of the joint was 0. 635 mm,1. 44 mm,1. 83 mm,*** penetration,additional bending moment( Ma) and decrease of effective load region area are considered to explain this phenomenon. The fracture location of tensile specimens occurred at the weld zone( WZ) close to partial melt zone( PMZ),corresponding to a sharp decline of microhardness from PMZ to WZ. The original position of fracture is found at weld toe,where incomplete penetration forms due to the introduction of gradient mismatches.

关键词： 2219-T6 aluminum alloy VP-TIG gradient mismatches microstructure mechanical properties