采用X-ray衍射,DTA以及扫描电镜分析了Ti-50at%Al元素混合粉末高能球磨和热压过程中的结构演变和致密TiAl基合金的显微结构.结果表明,Ti-50at%Al粉末经过100h的高能球磨后转化为无序非晶相,Ti和Al元素粉末在机械合金化过程中的结构演变为:Ti + Al →Ti(Al)过饱和固溶体(hcp)→非晶相.Ti-50at%Al非晶粉末在随后的热压过程中发生晶化,得到晶粒尺寸约为0.5μm的细晶TiAl基合金.Ti-50at%Al非晶的晶化过程为:非晶相→无序α相(hcp)→γ-TiAl相(+α2-Ti3Al相),其中α相是由无序非晶相向有序γ-TiAl相转化过程中的介稳相.根据热压后γ-TiAl相的不规则块状形貌推测α→γ-TiAl转变的机制可能为块型转变.
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