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MICROSTRUCTURE AND MECHANICAL PROPERTY OF Ti-80%Ni ALLOY PREPARED BY LASER SOLID FORMING |
XU Xiaojing1, 2), LIN Xin1), HUANG Weidong1), WANG Liang2) |
1) State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072
2) Aerospace Research Institute of Materials & Processing Technology, Beijing 100076 |
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Cite this article:
XU Xiaojing LIN Xin HUANG Weidong WANG Liang. MICROSTRUCTURE AND MECHANICAL PROPERTY OF Ti-80%Ni ALLOY PREPARED BY LASER SOLID FORMING. Acta Metall Sin, 2010, 46(9): 1081-1085.
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Abstract Ti-80%Ni alloy was prepared by laser solid forming (LSF) under different processing parameters. The microstructure of the alloy consists of η-TiNi3 phase under low scanning rate v and power P. With the increase of scanning rate, TiNi(B2)+η eutectic appeared, and with the increase of laser power, η laths were broken into bulks and distributed along certain orientation, and (TiNi(B2)+η) devoiced eutectic+inter-lath (TiNi(B2)+η) eutectic appeared. The higher the power is, the finer the η bulks are. And the enhanced power leads to a growing up of (TiNi(B2)+η) eutectic volume fraction. The microstructure became much fine with increasing v and P, while the volumn fraction of hard-brittle η lath decreased, as a result, the laser formability and plasticity of Ti-80%Ni both increased.
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Received: 21 April 2010
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Fund: Supported by National Natural Science Foundation of China (No.50971102), National High Technology Research and Development Program of China (No.2006AA03Z0449), National Basic Research Program of China (No.2007CB613805), Program for New Century Excellent Talents in University of China (No.NCET-06-0879), Programme of Introducing Talents of Discipline to Universities (No.08040) |
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