摘要
采用V形混粉方法制备SiC_(w)/Ti6Al4V合金复合粉末,并利用选区激光熔化(selective laser melting,SLM)制备SiC_(w)/TiC/Ti6Al4V钛基复合材料。对比SiC_(w)/TiC/Ti6Al4V钛基复合材料和Ti6Al4V合金在不同变形条件下的热压缩行为,建立了SiC_(w)/TiC/Ti6Al4V钛基复合材料在高温压缩时的本构方程。结果显示,在压缩变形时,流变应力随着应变速率的增大而增大,随温度的升高而降低,复合材料的流变应力峰值均高于Ti6Al4V合金;在变形温度为900℃、应变速率为1s^(-1)时,SiC_(w)/TiC/Ti6Al4V钛基复合材料相较Ti6Al4V合金抗压缩性能提升了140%,强化效果最明显。SLM成形过程中原位反应生成TiC增强相引起的载荷传递强化及针状马氏细化引起的细晶强化是高温压缩性能得到提升的主要原因。
SiC_(w)/Ti6Al4V composite powder was prepared using a V-shaped powder mixing method,and SiC_(w)/TiC/Ti6Al4V titanium matrix composites were subsequently fabricated via selective laser melting(SLM).The hot compression behavior of the SiC_(w)/TiC/Ti6Al4V composites was compared with that of the Ti6Al4V alloy under various deformation conditions,and a constitutive equation describing the high-temperature compressive response of the composite was established.The results revealed that,during compression deformation,the flow stress increased with rising strain rate and decreased with increasing temperature.The peak flow stress of the composite was consistently higher than that of the monolithic Ti6Al4V alloy.Notably,at a deformation temperature of 900℃and a strain rate of 1 s^(-1),the SiC_(w)/TiC/Ti6Al4V composite exhibited a 140%increase in compressive strength relative to Ti6Al4V,representing the most pronounced strengthening effect observed.This significant enhancement in high-temperature compressive performance is primarily attributed to two mechanisms:load-transfer strengthening from the in-situ formed TiC reinforcement phase generated during the SLM process,and grain refinement strengthening resulting from the refined needle-like martensitic microstructure.
作者
柳佶涛
霍鹏丞
白培康
赵占勇
Liu Jitao;Huo Pengcheng;Bai Peikang;Zhao Zhanyong(College of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,Shanxi,China;School of Materials Science and Engineering,North University of China,Taiyuan 030051,Shanxi,China)
出处
《应用激光》
北大核心
2026年第1期47-58,共12页
Applied Laser
基金
国家自然科学基金(U22A20192)。
