TiAl合金定向凝固过程中与坩埚材料的界面反应研究  

Investigation of Interfacial Reactions between TiAl Alloy and Crucible Materials during Directional Solidification Process

作　　者：罗文忠[1] 沈军[1] 闵志先[1] 傅恒志[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《稀有金属材料与工程》2009年第8期1441-1445,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50474054)

摘　　要：对定向凝固过程中Ti-47Al合金与氧化铝、氧化锆和石墨坩埚之间的界面反应进行实验研究。通过用光学显微镜和扫描电镜对凝固组织观察发现,TiAl合金与氧化铝坩埚之间的界面反应较为严重,在凝固组织中形成了大量氧化铝夹杂;TiAl合金与氧化锆坩埚的界面反应仅发生在试样表面,但该坩埚在高温下不稳定,并在试棒表面形成一层无法剥离的粘结层;石墨坩埚中的C元素改变了原有TiAl合金的凝固路径,生成了棒状的γ-TiAl相。Interfacial reactions between Ti-47Al alloy and crucible materials of Al2O3, ZrO2, and graphite during directional solidification process were investigated. By the OM and SEM observation of solidification microstrueture, the interracial reaction between TiAI alloy and Al2O3 crucible was serious, and a large number of a-Al2O3 inclusion formed in the solidification microstructure. The interfacial reaction between TiAI alloy and ZrO2 crucible occurred only on the sample surface, but the crucible was not stable at high temperature and a tack coating was formed, clinging tightly with TiAI alloy. C element in the graphite crucible changed the original solidification path of TiAl alloy, and club-shaped γ-TiAl phases formed.

关 键 词：TIAL合金 定向凝固 界面反应 

分 类 号：TG146.23[一般工业技术—材料科学与工程]