烧结温度对Micro-FAST制备TC4钛合金的影响

Effects of sintering temperature on preparation of TC4 titanium alloy during Micro-FAST

采用多物理场活化烧结微成形技术(Micro-FAST)快速制备TC4微型圆柱,研究烧结温度对TC4微型圆柱的致密化过程及力学性能的影响。研究发现,Micro-FAST技术可在5 min内实现TC4的快速成形,在900～1200℃的烧结温度区间均可获得相对密度大于97%的微型圆柱件,其显微组织由条状α相和β相组成,组织分布均匀、晶粒细小。当烧结温度为1000℃时,硬度达到最大值380.3HV0.5,较传统方法制备的TC4零件硬度提高10%。随着烧结温度的提高,烧结体中出现魏氏组织,合金的韧性逐渐降低。

The rapid preparation of TC4 micro-cylinder was realized by micro-forming fields activated sintering technology(Micro-FAST).The effect of sintering temperature on the densification process and mechanical properties of TC4 micro cylinders was studied.The results show that Micro-FAST can realize the rapid forming of TC4 micro cylinder parts with relative density greater than 97%at the sintering temperatures of 900?1200℃in 5 min.The microstructure is composed of stripαphase andβphase with the uniform distribution of the organization and fine grain.The TC4 alloy prepared by Micro-FAST has a maximum hardness of 380.3HV0.5 at the sintering temperature of 1000℃,which is 10%higher than that of TC4 parts prepared by traditional method.With increasing in sintering temperature,the sample is observed to appear the Widmanststten structure,the toughness of the alloy gradually reduces.