【摘要】 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.更多还原

【Abstract】 Ti-80%Ni alloy was prepared by laser solid forming（LSF） under different processing parameters.The microstructure of the alloy consists ofη-TiNi₃ phase under low scanning rate v and power P.With the increase of scanning rate,TiNi（B2）+ηeutectic appeared,and with the increase of laser power,ηlaths 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 theηbulks 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-brittleηlath decreased,as a result,the laser formability and plasticity of Ti-80%Ni both increased.更多还原