高延性TiAl合金的微观组织特征  

MICROSTRUCTURE CHARACTERISTICS OF A HIGH DUCTILITY γ-TiAL ALLOY

作　　者：陈小群[1] 黄伯云[1] 贺跃辉[1] 曲选辉[1] 雷昶辉[2] 

机构地区：[1]中南工业大学,长沙410083 [2]中国科学院北京电镜实验室,北京100080

出　　处：《金属学报》1997年第7期683-689,共7页Acta Metallurgica Sinica

基　　金：国家"863"计划;国家自然科学基金!50371001;中国科学院北京电镜实验室资助

摘　　要：研究了Ti－33Al－3Cr－0、5Mo合金经包套锻复合热机械处理后的显微组织与力学性能．结果表明，合金经1250℃，4h及控制冷却的最终热处理，可获得以均匀细小等轴γ晶粒为主，含少量β2相和少量α2相的亚双态组织由于晶粒细化和晶界结构改善，该合金室温拉伸延性达到5．07％The microstructure and mechanical properties of a titanium aluminide alloy, Ti-33Al-3Cr-0.5Mo, under a multi-step thermo-mechanical treatment were studied. A sub-duplex microstructure with fine equiaxial y grains as the major phase and β2, α2 as the minor phases was obtained after final heat treatment at 1250℃, for 4h+controlled cooling.Tensile elongation for the alloy can reach 5.07% at room temperature. The principal reasons for disproving elongation are the refine of grain and improvment of grain boundary structure.

关 键 词：显微组织 力学性能 钛铝合金 

分 类 号：TG146.23[一般工业技术—材料科学与工程]