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采用纯铜中间层的TiNi形状记忆合金激光焊接 预览 被引量:1

Laser Welding of TiNi Shape Memory Alloy Using Pure Cu as Interlayer
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摘要 采用纯Cu中间层,对TiNi形状记忆合金丝脉冲激光焊接进行研究。利用光学显微镜,扫描电镜,微区XRD等分析测试手段,研究了TiNi形状记忆合金丝激光焊接头的微观组织特点。为研究接头的力学性能和形状记忆效应,对其进行拉伸和弯曲试验。结果表明,焊缝区组织分布不均匀,不同形貌区域的成分差别较大,XRD分析焊缝区生成了B2,B19’,Ti3Ni4,Cu基固溶体及Cu与Ti的金属间化合物相CuTi,Cu4Ti3,Cu3Ti2,Cu3Ti等。TiNi形状记忆合金激光焊接头抗拉强度为489-536MPa,断口呈典型的韧-脆混合断裂特征。形状记忆恢复率达99%以上。 YAG laser welding was used to join TiNi shape memory alloy thin wires with pure Cu as interlayer.The microstructural charactertics were investigated by means of optical microscopy,scanning electronic microscopy and micro-XRD et al.The tensile and bending tests were carried out to examine the mechanical properties and shape memory effect of the joint.Experimental results show that the joint has the heterogeneous microstructure and element distribution.B2,B19',Ti3Ni4,Cu solid solution and the intermetallic compounds,such as CuTi,Cu4Ti3,Cu3Ti2,Cu3Ti2,Cu3Ti were detected in fusion zone by XRD test.The laser-welded joint exhibits the ultimate strength of 489-536 MPa with ductile-brittle mixed fracture mode,and the shape recovery ratio reaches to 99%.
作者 李洪梅 孙大千 王文权 韩耀武 董鹏 LI Hong-mei,SUN Da-qian,WANG Wen-quan,HAN Yao-wu,DONG Peng(Key Laboratory of Automobile Materials(Ministry of Education),School of Materials Science and Engineering,Jilin University,Changchun 130025,China)
出处 《材料工程》 EI CAS CSCD 北大核心 2010年第10期 9-12,26,共5页 Journal of Materials Engineering
基金 国家自然科学基金资助项目(50975112)
关键词 激光焊 TINI形状记忆合金 组织 力学性能 laser welding TiNi shape memory alloy microstructure mechanical property
作者简介 作者简介:李洪梅(1982-),女,博士研究生,主要从事先进材料连接的研究工作,联系地址:吉林大学材料科学与工程学院(130025),E—mail:lihm08@mails.jlu.edu.cn
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