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Simulation on Magnetostriction Strain of Polymer-bonded Terfenol-D Composites

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Journal of Materials Science & Technology 2003年第z1期19卷 103-104页

作者： jiuchun yan Shixiong LU Shiqin yanG Shiyu HE State Key Laboratory of Advanced Welding Production Technology Hanbin Institute of Technology Harbin 150001 China State Key Laboratory of Advanced Welding Production Technology Hanbin Institute of Technology Harbin 150001 China State Key Laboratory of Advanced Welding Production Technology Hanbin Institute of Technology Harbin 150001 China State Key Laboratory of Advanced Welding Production Technology Hanbin Institute of Technology Harbin 150001 China

A model of magnetostrictive strain for polymer-bonded Terfenol-D composite is presented, which is composed of asubmodel for the average strain of Terfenol-D composite and a magnetostriction submodel for Terfenol-D *** results show that the saturation magnetostriction λs is very closely with experimental results, althoughthere exists some difference between the calculated and the experimental results under low applied magnetic *** saturation magnetostriction of the composites increases with the particle fraction (v1=72.5～90 vol. Pct) in thesimulated and experimental results, but the simulation result is not ideal when the particle fraction is higher than 85%.

关键词： Polymer-bonded Terfenol-D composite, Magnetostriction, Simulation

Behaviors of Oxide Layer at Interface between Semi-solid Filler Metal and Aluminum Matrix Composites during Vibration

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Journal of Materials Science & Technology 2011年第8期27卷 746-752页

作者： Lei Shi jiuchun yan yanfei Han Bo Peng State Key Laboratory of Advanced Welding and Joining School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China

The joint interface between semi-solid Zn-Al filler metal and SiCp/Al composites with applying vibration for different time was examined. With increasing vibrating time, the oxide layer was disrupted prior at the centre to the periphery of the interface. And the solid grains near the centre of interface in semi-solid filler metal aggregated into two solid regions and compressed the composites during vibration; the solid grains near the periphery of interface moved toward the edge and scraped the composites during vibration. The models of disrupting oxide layer under the vibration condition were developed. At the centre of interface, the oxide layer was tore and stripped during the solid grains in the semi-solid filler metal depressing the composites with a very high compressive stress. At the periphery of interface, the oxide layer was cut and stripped into the filler metal during the solid grains scraping the interface.

关键词： SiCP/Al composites Brazing Oxide layer Semi-solid state

Migrating behaviors of interfacial elements and oxide layers during diffusion bonding of 6063Al alloys using Zn interlayer in air

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Journal of Materials Science & Technology 2023年第24期155卷 119-131页

作者： Pu Zhao Zhengwei Li Zhiwu Xu Xuesong Leng Anqi Tong jiuchun yan State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001 China Flexible Printed Electronics Technology Center Harbin Institute of Technology Shenzhen 518055 China University of Science and Technology Liaoning Anshan 114051 China

The oxide layer on the surface has always been a key obstacle to achieving the diffusion bonding of Al *** is a challenge for performing diffusion bonding without removing oxide ***,diffusion bonding of Al alloy retaining continuous oxide layers was successfully achieved in the air by a low-temperature and low-pressure diffusion bonding mothed using a Zn *** the bonding processes,conducted at 360℃ and 3 MPa,Zn diffused into Al through cracks of thin oxide layers to form the joint composed Al/(diffusion layer)/(oxide layer)/(Zn)/(oxide layer)/(diffusion layer)/*** diffusion layers were composed of Zn-Al eutectoid,and the oxide layer included nanocrystals and amorphous Al_(2)O_(3).The shear strength of joints containing continuous oxide layers was about 30 ***,the migration behavior toward the joint center of the interfacial oxide layers was observed with consuming of the Zn *** cracking phenomenon,the“subcutaneous diffusion”and the migration behavior of oxide layers were verified and analyzed by the diffusion bonding of anodized ***,the dynamic migration mechanism of oxide layers with elements diffusion and bonding interface strengths were discussed in *** ability to join Al alloys in the air at low temperatures and low pressure suggests a highly practical and economic method for diffusion bonding.

关键词： 6063Al alloy Diffusion bonding Zn interlayer Oxide layers Migration behavior

Interfacial Structure and Formation Mechanism of Ultrasonic-assisted Brazed Joint of SiC Ceramics with Al—12Si Filler Metals in Air

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Journal of Materials Science & Technology 2017年第5期33卷 492-498页

作者： Xiaoguang Chen Ruishan Xie Zhiwei Lai Lei Liu jiuchun yan Guisheng Zou State Key Laboratory of Advanced Welding and Joining School of Materials Science and Engineering Harbin Institute of Technology Department of Mechanical Engineering Key Laboratory for Advanced Manufacturing by Materials Processing Technology Tsinghua University College of Material Science and Engineering Taiyuan University of Technology

Ultrasonic-assisted brazing of SiC ceramics was performed by filling with an Al-12Si alloy at a low tem- perature of 620 ℃ in air. The interracial characteristics and formation mechanism were investigated. The joint shear strength reached 84-94 MPa using the ultrasonic time of 2-16 s. The fracture morphology showed that the fracture path initiated and propagated in the joint alloy. The thin film of amorphous SiO2 that formed on the SiC surface was non-uniformly decomposed and diffused into the liquid Al-12Si alloy under the cavitation erosion effect of ultrasound. Abnormal isolated blocks of A12SiO5 compounds formed at the interface between Al-12Si and a thicker SiO2 layer formed during the thermal oxidation treatment of the SiC ceramic. The SiO2 layer on the SiC ceramic did not hinder or impair the wetting and bonding process, and a stronger bond could form between Al-12Si and SiO2 or SiC in ultrasonic- assisted brazing.

关键词： Ultrasonic Brazing Ceramic Interface Cavitation erosion

Al 1060/Pure Iron Clad Materials by Vacuum Roll Bonding and Their Solderability

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Journal of Materials Science & Technology 2013年第10期29卷 948-954页

作者： Qian Wang Xuesong Leng jiuchun yan Weibing Guo Yu Fu Tianming Luan State Key Laboratory of Advanced Welding and Joining School of Materials Science and EngineeringHarbin Institute of Technology

Al 1060/pure iron clad materials were produced by vacuum roll bonding. The effects of preheating temperature, vacuum roll reduction and initial thickness of the A11060 sheet on the metal interface and bonding strength were investigated. The interfacial microstructure was investigated and the mechanical properties of the joint were evaluated by shear testing. The bonding strength of the clad materials was generally enhanced by increasing the total reduction or preheating temperature, which caused the metal interface to flatten. No obvious reaction or diffusion layer was observed at the interface between Al 1060 and pure iron. The bonding strength increased with decreasing the initial thickness of the Al 1060 sheets. The Al 1060/pure iron clad materials were soldered with Zn-Al alloy by using an ultrasonic-assisted method. Strong bonding of the Al 1060 layer and Al 7N01 was realized without obvious Al 1060 dissolution or effect on the initial interface of Al 1060/pure iron clad materials by soldering at relatively low temperature.

关键词： Al 1060/pure iron clad materials Vacuum roll bonding Bonding strength Ultrasonic-assisted soldering

Microstructure Characteristics of Interaction Layer of Zn-Al Eutectic Alloy with Al_2O_3p/6061Al Composites

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Journal of Materials Science & Technology 2004年第4期20卷 401-404页

作者： jiuchun yan, Zhiwu XU, Shixiong LU and Shiqin yanGState Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001, China Lab. of Adv. Welding Technol. Harbin Inst. of Technol. Harbin 150001 China

The interaction between Zn-AI eutectic alloy and Al203p/6061AI composites in the vacuum furnace was investigated. Great attention has been paid to the elements diffusion, the microstructure and formation of the interface between Zn-AI eutectic alloy and Al2O3p/6061AI composites. Experimental results show that Zn-AI eutectic alloy has a good wetting ability to Al2O3p/6061 Al composites and the wetting angle decreases with increasing the temperature in vacuum. After the interaction, an interaction layer forms between Zn-AI alloy and Al2O3p/6061 Al composites. The phases in the interaction layer mainly consist of α-AI(Zn), Al2O3 and CuZn5 resulted from the diffusion of elements from the Zn-AI alloy. Several porosities distribute in the region near the interface of the Zn-AI alloy/interaction layer. The amount of shrinkage voids in the interacting layer is relevant to the penetration of Zn element into Al2O3p/6061Al composites which is a function of temperature. So it is necessary to lower heating temperature in order to limit the Zn penetration.

关键词： Al2O3p/6061Al composites Zn-Al eutectic alloy Wetting Interface microstructure

Simulation on Domain Rotation Path and Magnetostriction of Terfenol-D Alloy

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Journal of Materials Science & Technology 2001年第4期17卷 473-475页

作者： jiuchun yan , Wenbo HAN,Xaoqiu XIE and Shiqin yanG National Key Laboratory of Advanced Welding Production Technology, Department of Material Science and Engineering, Harbin Institute of Technology Harbin 150001, China Dept. of Mat. Sci. and Eng. Harbin Inst. of Technol. Harbin 150001 China

Based on a simplified domain rotation model, the rotation path of internal domains and cor- responding magnetostriction of , oriented single Tedenol-D crystals under com- pressive prestresses have been simulated. Comparisons with results of experiment and other calculation have been made. Results of simulation showed that the oriented single crystal has better low-field magnetostriction properties than the oriented one. Under a compressive prestress of 10 MPa, up to 2300×10-6 saturation magnetostriction of oriented crystal has been obtained at 800 Oe, while for oriented. 1600×10-6 maximum magnetostriction has been reached at 1000 Oe.

关键词： Simulation on Domain Rotation Path and Magnetostriction of Terfenol-D Alloy Path

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真空热轧连接技术及应用

机械制造文摘（焊接分册） 2024年第1期 34-37页

作者：东彦宏王硕于汉臣赵普李燕霞吴仕壕闫久春哈尔滨工业大学先进焊接与连接国家重点实验室哈尔滨150001 北京遥感设备研究所北京100854

许多异种金属焊接结构,由于材料本征属性差异大,无法直接熔焊连接。利用真空热轧制备异种金属复合结构是工程适应性最佳方案。文中介绍了真空制坯和真空无制坯两种热轧方法的技术原理及其研究现状,并分析了两种方法的技术差异。文中为... 详细信息

许多异种金属焊接结构,由于材料本征属性差异大,无法直接熔焊连接。利用真空热轧制备异种金属复合结构是工程适应性最佳方案。文中介绍了真空制坯和真空无制坯两种热轧方法的技术原理及其研究现状,并分析了两种方法的技术差异。文中为异种金属结构连接提供了有效的途径。

关键词：异种金属复合板轧制连接真空工艺特点

SiC_p/A356复合材料超声波辅助钎焊

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焊接学报 2009年第3期30卷 89-92页

作者：张洋闫久春陈晓光哈尔滨工业大学现代焊接生产技术国家重点实验室哈尔滨150001

利用超声波辅助钎焊的方法实现了Zn-Al合金与体积分数55%SiCp/A356复合材料的连接,并得到了由SiC陶瓷颗粒增强的复合焊缝.通过扫描电镜、能谱等方法对焊缝的微观结构进行了描述,研究了超声波作用时间对焊接接头微观组织结构及连接强度... 详细信息

利用超声波辅助钎焊的方法实现了Zn-Al合金与体积分数55%SiCp/A356复合材料的连接,并得到了由SiC陶瓷颗粒增强的复合焊缝.通过扫描电镜、能谱等方法对焊缝的微观结构进行了描述,研究了超声波作用时间对焊接接头微观组织结构及连接强度的影响规律,建立了超声波作用下复合焊缝形成过程的物理模型.当焊接温度为475℃,超声波作用时间为20 s时钎焊焊缝的平均抗剪强度值为231 MPa.由SiC陶瓷增强的复合焊缝其室温抗剪强度与无增强相颗粒的纯合金焊缝强度相比提高了50%.结果表明,焊缝中铝含量的增加及陶瓷颗粒的增强作用是导致焊缝强度提高的两个重要因素.

关键词：铝基复合材料超声波辅助钎焊抗剪强度微观组织结构焊缝形成过程