Microstructure and properties of laser micro welded joint of TiNi shape memory alloy

被引：23

作者：

Gong Wei-huai ^{[1
]}

Chen Yu-hua ^{[1
,2
]}

Ke Li-ming ^{[1
]}

机构：

[1] Nanchang Hangkong Univ, Natl Def Key Disciplines Lab Light Alloy Proc Sci, Nanchang 330063, Peoples R China

[2] Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2011年 / 21卷 / 09期

关键词：

TiNi shape memory alloy; laser micro welding; microstructure; properties; phase transformation behavior; BEHAVIOR;

D O I：

10.1016/S1003-6326(11)60970-9

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Butt welding of 0.2 mm-thick TiNi shape memory alloy sheet (SMA) was carried out using impulse laser, and tensile strength, fracture morphology, microstructure and phase change behaviour of welded joint were studied. The results show that using impulse laser can realize good butt welding of TiNi SMA sheet, tensile strength of welded joint is 683 MPa, which achieves 97% of that of cold rolled base metal, and the fracture mode of welded joint is ductile type as well as base metal. The welded joint can be divided into four zones according to grain size and microstructure. The microstructures of welded seam center zone are fine equiaxed crystals and the microstructures of both lower surface and upper surface edge zones are columnar crystals. When welded joint is vacuum annealed after welding, the phase transformation process is basically similar to the annealed base metal.

引用

页码：2044 / 2048

页数：5

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