论文部分内容阅读
The as-cast microstructure,mechanical properties and casting fluidity of ZA84 alloy containing TiC were investigated.The experimental results indicate that adding 0.5wt%TiC to ZA84 alloy can refine the as-cast microstructure,and do not cause the formation of any new phase.After 0.5wt%TiC was added to the ZA84 alloy,the morphology of ternary phases on the grain boundaries changed from coarse quasi-continuous net to fine disconnected net,and the distribution of ternary phases became dispersive and homogeneous.At the same time,the tensile properties of ZA84+0.5TiC alloy at room temperature were comparable to those of AZ91D alloy,and were higher than those of ZA84 alloy.At 150 ℃,the tensile and creep properties of ZA84+0.5TiC alloy were also higher than those of ZA84 and AZ91D alloys.In addition,compared with the AZ91D alloy,the casting fluidity of ZA84+0.5TiC alloy was slightly poor,but better than that of ZA84 alloy.The reason could be related to the effect of TiC on the solidification temperature range of ZA84 alloy.
The as-cast microstructure, mechanical properties and casting fluidity of ZA84 alloy containing TiC were investigated. The experimental results indicate that adding 0.5 wt% TiC to ZA84 alloy can refine the as-cast microstructure, and do not cause the formation of any new phase .After 0.5 wt% TiC was added to the ZA84 alloy, the morphology of ternary phases on the grain boundaries changed from coarse quasi-continuous net to fine disconnected net, and the distribution of ternary phases became dispersive and homogeneous. At the same time, the tensile properties of ZA84 + 0.5TiC alloy at room temperature were comparable to those of AZ91D alloy, and were higher than those of ZA84 alloy. At 150 ℃, the tensile and creep properties of ZA84 + 0.5TiC alloy were also higher than those of ZA84 and AZ91D alloys. In addition, compared with the AZ91D alloy, the casting fluid of ZA84 + 0.5TiC alloy was slightly poor, but better than that of ZA84 alloy. The reason could be related to the effect of TiC on the solidification temperature range of ZA84 alloy.