γ-TiAl基合金定向凝固特性研究  

Research on the γ-TiAl Based Alloy Directional Solidification Characteristic

作　　者：许雄[1] 沈军[1] 彭桂林[1] 郑循强[1] 丁宏升[2] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,西安710072 [2]哈尔滨工业大学金属精密热加工国防重点实验室,哈尔滨150001

出　　处：《材料导报》2005年第6期105-107,共3页Materials Reports

基　　金：国家自然科学基金重大项目(No.50474054);航空科学基金(No.02G53047)资助

摘　　要：用定向凝固方法在不同的生长速度下成功地制备了一批γ-TiAl 定向凝固试样。通过对不同生长速率下形成的γ-TiAl 金相组织观察和分析后发现:随着生长速率的增加,原先的初生稳定相β相的数量逐渐减少,亚稳相α相的数量逐渐增加;最后形成的由α_2和γ组成的片层组织的片层间距λ与生长速率的 V^(1/3)近似成反比关系。γ-TiAI samples with directional morphology are successfully prepared by using directional solidification technology at different drawing speeds.As research work is done on the observation and analyzing of γ-TiAl peritectic reaction metallographic samples,it is found that with the increasing of growth rate,percentage composition of the original primary sta- ble phase β decreases and metastable phase α increases;for the finally formed lamellar structure made up of α_2 and γ lami- nas,the mean value of interlamellar(made up of α_2 and γ phases)spacing is approximately in inverse proportion to growth rate cubic root.

关 键 词：定向凝固 特性研究 基合金 生长速率 生长速度 组织观察 片层组织 稳定相 亚稳相 层间距 金相 

分 类 号：TG132.32[一般工业技术—材料科学与工程] TG13[金属学及工艺—合金]