激光立体成形Ti-80%Ni合金显微组织及力学性能
收稿日期: 2010-04-21
修回日期: 2010-06-28
网络出版日期: 2010-09-11
基金资助
国家自然基金重点项目50971102, 国家高技术研究发展计划项目2006AA03Z0449, 国家重点基础研究发展计划项目2007CB613805,
新世纪优秀人才支持计划项目NCET--06--0879, 高等学校学科创新引智计划项目08040, 西北工业大学基础研究基金项目NPU-FFR-JC200808和凝固技术国家重点实验室(西北工业大学)自主研究课题项目16-TZ-2007和39-QZ-2009资助
MICROSTRUCTURE AND MECHANICAL PROPERTY OF Ti-80%Ni ALLOY PREPARED BY LASER SOLID FORMING
Received date: 2010-04-21
Revised date: 2010-06-28
Online published: 2010-09-11
Supported by
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)
采用激光立体成形技术制备了Ti-80%Ni(质量分数)合金, 研究了工艺参量对显微组织和力学性能的影响. 结果表明, 激光立体成形 Ti-80%Ni合金由η-TiNi3板条和TiNi(B2)+η共晶构成. 随着激光扫描速率的增大, η板条逐渐转变为 η板条+(TiNi(B2)+η)共晶, η板条尺寸随着扫描速率的增大而减小; 随着激光功率的增大, 共晶体积分数逐渐增大, η板条逐渐碎断转变为一定取向的块状组织, 功率越大, 块状组织越细, 形成(TiNi(B2)+η)离异共晶组织+板块间 (TiNi(B2)+η)共晶组织. 激光扫描速率和激光功率的增大均导致硬脆η板条含量减少, 合金的成形性和塑性增加.
许小静 , 林鑫 , 黄卫东 . 激光立体成形Ti-80%Ni合金显微组织及力学性能[J]. 金属学报, 2010 , 46(9) : 1081 -1085 . DOI: 10.3724/SP.J.1037.2010.00190
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.
Key words： laser solid forming(LSF); laser processing parameters; microstructure; Ti-80%Ni; η lath
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