Study on the Microstructure of Micro Laser Welded Joint of TiNi Shape Memory Alloy Sheet

2010 ◽  
Vol 97-101 ◽  
pp. 3936-3939 ◽  
Author(s):  
Yu Hua Chen ◽  
Li Ming Ke ◽  
Ying Liu ◽  
Shi Long Xu
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Base Metal ◽  
Welded Joint ◽  
Average Power ◽  
Lower Surface ◽  
Alloy Sheet ◽  
Edge Zone ◽  
Welded Seam ◽  
Micro Laser Welding

Butt welding of 0.2mm thick TiNi shape memory alloy sheet was successfully realized by using micro impulse laser whose average power is 80W and the microstructure of welded joint was study in this paper. The results show that, the welded joint of micro laser welding can be divided into four zones according to grain size and microstructure. The microstructure in base metal zone is rolled structure and the grains are coarse and heterogeneous. The microstructures of welded seam center zone are fine equiaxed crystals and the microstructures of both lower surface and upper surface edge zone are columnar crystals. There is almost no obvious coarse grain heat-affected zone at the edge between welded seam and base metal. There is obvious segregation layer in local area of welded seam because the content of Ti and Ni elements is changed and different with base metal during the crystallizing course of welding pool.

YAG Laser Welding of Shape Memory Alloy

2011 ◽  
Vol 66-68 ◽  
pp. 798-801
Author(s):  
Hai Shen Zhou ◽  
Hong Guang Li ◽  
Wei Wang
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Welded Joint ◽  
High Energy ◽  
Alloy Sheet ◽  
Yag Laser ◽  
Beam Method ◽  
Recovery Mechanisms ◽  
Comparison Of The Results ◽  
Welding Procedure

With high energy YAG Laser beam method, the weld ability of the TiNi shape memory alloy sheet was studied.The mechanical properties of both reference and laser welded samples were tested by stress–strain measurements. A systematic comparison of the results was carried out. Moreover, differential scanning calorimeter (DSC) investigations on samples taken from the heat affected zone and hardness measurements allowed further clarification that the modification was induced by the welding procedure. The crystal grain in welded joint is large , and new phases such as Ni3Ti separate out.The results obtained on laser welded samples indicate the recovery mechanisms are little weakly modified by the presence of the welding zone.

Micro laser welding of dissimilar materials between TiNi shape memory alloy and titanium alloy

2014 ◽  
Vol 22 (8) ◽  
pp. 2075-2080 ◽  
Author(s):  
陈玉华 CHEN Yu-hua ◽  
戈军委 GE Jun-wei ◽  
刘奋成 LIU Fen-cheng ◽  
柯黎明 KE Li-ming
Keyword(s):  
Titanium Alloy ◽  
Shape Memory Alloy ◽  
Laser Welding ◽  
Shape Memory ◽  
Dissimilar Materials ◽  
Micro Laser Welding

Effect of texture orientation on the martensite deformation of NiTi shape memory alloy sheet

1999 ◽  
Vol 47 (2) ◽  
pp. 645-660 ◽  
Author(s):  
Y. Liu ◽  
Z.L. Xie ◽  
J. Van Humbeeck ◽  
L. Delaey
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Alloy Sheet ◽  
Niti Shape Memory Alloy ◽  
Texture Orientation

scholarly journals Infrared Brazed Joints of Ti50Ni50 Shape Memory Alloy and Ti-15-3 Alloy Using Two Ag-Based Fillers

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1603 ◽  
Author(s):  
Chieh Lin ◽  
Ren-Kae Shiue ◽  
Shyi-Kaan Wu ◽  
Tsung-En Yang
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Base Metal ◽  
Bonding Strength ◽  
Brazed Joints ◽  
Filler Metals

The wettability, microstructures, and bonding strength of infrared brazing Ti-15-3 and Ti50Ni50 shape memory alloy using 72Ag-28Cu (wt.%) and 68.8Ag-26.7Cu-4.5Ti (wt.%) filler metals have been investigated. Only Ticusil® active braze readily wets both Ti50Ni50 and Ti-15-3 substrates. Wetting of eutectic 72Ag-28Cu melt on Ti50Ni50 base metal is greatly ameliorated by adding 4.5 wt.% Ti into the alloy. The brazed Ti-15-3/BAg-8/Ti50Ni50 joint consists of Cu-Ti intermetallics in the Ag-rich matrix. The formation of interfacial Cu(Ti,V) and (CuxNi1−x)2Ti intermetallics next to Ti-15-3 and Ti50Ni50 substrates, respectively, is attributed to the wetting of both substrates. The brazed Ti-15-3/Ticusil®/Ti50Ni50 joint shows a vigorous reaction, which results in the formation of a large amount of Ti2Ni intermetallics in the joint. The maximum joint strengths using BAg-8 and Ticusil® filler metals are 197 MPa and 230 MPa, respectively.

Analytical and experimental study of shape memory alloy reinforcement on the performance of butt-fusion welded joints in high-density polyethylene pipe

2020 ◽  
Vol 31 (17) ◽  
pp. 2029-2043
Author(s):  
Eunsoo Choi ◽  
Alireza Ostadrahimi ◽  
Heejung Youn
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
High Density Polyethylene ◽  
Welded Joint ◽  
High Density ◽  
Shape Memory Alloy Wire ◽  
Alloy Wire ◽  
Polyethylene Pipe ◽  
Polyethylene Pipes ◽  
Fusion Welded Joints

In this article, a shape memory alloy wire is employed as confinement to enhance the flexural rigidity of the butt-fusion welded joints in the high-density polyethylene pipes. To this end, analytical and experimental studies are considered, when the shape memory alloy wire is wrapped around a butt-fusion joint and an internal pressure is applied to the high-density polyethylene pipe. To investigate the efficiency of shape memory alloy wire jacket on the performance of butt-fusion welded joint in high-density polyethylene pipe, two cases of perfect butt-fusion joint and imperfect butt-fusion joint are tested. The influence of the number of shape memory alloy wire jacket on the high-density polyethylene pipe joints as well as the effect of different flexural rigidities of the wire and high-density polyethylene pipe, and different diameters are evaluated. The deformation is measured using linear voltage displacement transducer and digital image correlation analysis at different location of the pipe length. In addition, radial strain of the pipes due to bulging is measured by electronic resistance strain gauges. Results show that the shape memory alloy wire jacket has a significant effect (33%) on enhancing imperfect butt-fusion welded joint of high-density polyethylene pipes.

scholarly journals Electrochemichal Pulse Etching for Micromachining of NiTi Shape Memory Alloy Sheet.

2002 ◽  
Vol 53 (3) ◽  
pp. 208-213 ◽  
Author(s):  
Takashi MINETA ◽  
Toshiaki MITSUI ◽  
Yoshiyuki WATANABE ◽  
Seiya KOBAYASHI
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Alloy Sheet ◽  
Niti Shape Memory Alloy
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