Ti-24Al-14Nb-3V-0.5Mo合金的压缩超塑性  

Superplastic Behavior of Ti-24Al-14Nb-3V-0.5Mo in Compressive Testing

作　　者：宋丹[1] 丁桦[1] 王殿梁[2] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110004 [2]沈阳工业学院,辽宁沈阳110015

出　　处：《东北大学学报（自然科学版）》2001年第6期660-663,共4页Journal of Northeastern University(Natural Science)

基　　金：辽宁省科技基金资助项目 ( 95 0 2 9)

摘　　要：对Ti 2 4Al 14Nb 3V 0 5Mo合金的超塑压缩变形行为进行了研究·结果表明 ,该合金的最佳超塑温度为 980℃ ,最佳应变速率范围为 (2× 10 -4 ～ 2× 10 -3 )s-1· 在超塑变形过程中 ,条状O相和α2 相中发生了动态再结晶和等轴化过程 ;B2相中发生了动态回复·新形成的硬相等轴晶粒可在软的基体中滑动和转动 ,造成的应力集中由B2相中的位错运动松弛·The superplastic behavior of Ti 24Al 14Nb 3V 0 5Mo was studied in compressive testing. The optimal superplastic deformation temperature is 980?℃ and the optimal strain rate ranges from 2×10 -4 s -1 to 2×10 -3 s -1 . In the superplastic deformation process, dynamic recrystallization takes place in α 2 and O phases and the lath like grains undergoes a separation process. While dynamic recovery occurs in B2 phase, newly formed equiaxed grains then slide and rotate in B2 phase. The stress concentration caused by sliding and rotating of hard particles could be released by dislocation movements in soft B2 phase.

关 键 词：TI3AL基合金 压缩变形 超塑性 组织演变 动态再结晶 动态回复 三钛铝基合金 Ti-24Al-14Nb-3V-0.5Mo合金 

分 类 号：TG146.2[一般工业技术—材料科学与工程]