Effect of welding current on the microstructure, residual stresses, mechanical properties and nano-mechanical behaviour of P-TIG welded TiNi binary shape-memory alloy

Huzaifa Asif; M. Imran Khan; Tauheed ShehbazFahd Nawaz KhanAsim IltafMassab Junaid

首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part L. Journal of Materials: Design and Application >Effect of welding current on the microstructure, residual stresses, mechanical properties and nano-mechanical behaviour of P-TIG welded TiNi binary shape-memory alloy

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Effect of welding current on the microstructure, residual stresses, mechanical properties and nano-mechanical behaviour of P-TIG welded TiNi binary shape-memory alloy

机译：Effect of welding current on the microstructure, residual stresses, mechanical properties and nano-mechanical behaviour of P-TIG welded TiNi binary shape-memory alloy

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In the present work, an autogenous TIG welding technique was used to join 2 mm thick sheets of a TiNi binary shape-memory alloy at three different values of current (80 A, 90 A and 100 A). The effects of the welding current on micro-structures, residual stresses, mechanical properties and nano-mechanical behaviour were investigated. Microstructure analysis revealed that with an increase in current, the columnar grain size decreased, which had a significant effect on mechanical properties. The tensile strength of the weldment at 100 A was ～92% of that base alloy's (BA) and elongation of approx. 14%. The reduction in elongation was due to the formation of Ti_2Ni and Ti_3Ni_4 type precipitates. The micro-hardness profile in all the weldments showed an increase of approx. 30% between the base alloy and the fusion zone due to the formation of Ti_2Ni and Ti_3Ni_4 type precipitates during welding. Residual stress analysis suggested the tensile residual stresses in the longitudinal direction are minimum in the weldment performed at 100 A. The nanoindentation results revealed that the weldment obtained at 100 A had the least plastic deformation (～45.5% less than the 80 A weldment) owing to a decrease in inter-dendritic spacing and high proportion of IMCs: Ti_2Ni and metastable Ni_4Ti_3.

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《Proceedings of the Institution of Mechanical Engineers, Part L. Journal of Materials: Design and Application》 |2022年第9期|1829-1841|共13页
作者
Huzaifa Asif; M. Imran Khan; Tauheed ShehbazFahd Nawaz KhanAsim IltafMassab Junaid;
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作者单位

Faculty of Materials and Chemical Engineering, Department of Materials Science, Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Topi, Pakistan;

Faculty of Mechanical Engineering, Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Topi, Pakistan;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
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TIG welding; shape-memory alloy; nanoindentation; AFM; residual stresses; SEM;

Effect of welding current on the microstructure, residual stresses, mechanical properties and nano-mechanical behaviour of P-TIG welded TiNi binary shape-memory alloy

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