Ti-45Al-5Nb(-0.3Y)合金的连续冷却相变规律  

Continuous Cooling Phase Transformation of Ti-45Al-5Nb(-0.3Y) Alloys

作　　者：孔凡涛[1] 肖树龙[1] 陈玉勇[1] 李宝辉[1] 

机构地区：[1]哈尔滨工业大学,黑龙江哈尔滨150001

出　　处：《稀有金属材料与工程》2009年第1期25-28,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50673047)资助

摘　　要：冷却速度对Ti-45Al-5Nb和Ti-45Al-5Nb-0.3Y合金连续冷却相变有较大的影响。炉冷形成全层片组织,空冷下层片形成被α→γm块状反应抑制,油冷形成了极细小的层片组织,水冷主要发生了α→α2有序化转变。空冷导致了羽毛状组织消失和α2相的增加,水冷导致α2晶界的细小层片晶团尺寸较小、数量较多。Y添加对Ti-45Al-5Nb合金连续冷却相变有较小的影响。Cooling rate has drastic effects on the continuous cooling transformation of Ti-45Al-5Nb and Ti-45Al-5Nb-0.3Y alloys. Furnace cooling （FC） leads to the fully lamellar mierostrueture. Air cooling suppresses the lamellar transformation by the α→ym reaction. Oil cooling leads to the extremely fine lamellar microstructure. At a higher cooling rate （such as water cooling）, the α2 phases are predominant. By air cooling a feathery structure disappears and the α2 phase increases. By water cooling, the extremely fine lamellar regions located at initial α2 grain boundaries are smaller and increase for the Ti-45Al-5Nb-0.3Y alloy. Y addition has slight effect on the phase transformation of Ti-45Al-Nb alloy.

关 键 词：TIAL合金 热处理 组织 相变 

分 类 号：TG146.23[一般工业技术—材料科学与工程]