采用真空非自耗电弧熔炼法制备了Nb-Ti-Si基共晶自生复合材料的母合金锭,分别于1300,1400,1500和1600℃保温50小时对其进行了均匀化处理,然后于1100℃保温50小时进行了时效处理.热处理后的组织主要由Nbss和(Nb,X)5Si3(X代表Ti,Cr和Hf元素)组成,但经1600℃/50h和1600℃/50h+1100℃/50h热处理后的组织中出现了HfO2.热处理后,Nbss的晶格常数较电弧熔炼态的有所升高,Ti,Cr和Al仍然倾向于固溶在Nbss中,而Hf则倾向于固溶在硅化物中.随着热处理温度的升高,Cr,Ti和Al在Nbss和大块硅化物(Nb,X)5Si3中的分配比降低,而Hf的则略有升高.
参考文献
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