Ti-47Al-2Mn-2Nb(at%)+0.8TiB_2(vol%)合金中的γ相层错分析  

Analysis on Stacking Faults in γ Phase of Ti-47Al-2Mn-2Nb(at%)+0.8TiB_2(vol%) Alloy

作　　者：张凯[1] 鲜小红[2] 陈善华[3] 

机构地区：[1]四川职业技术学院建筑与环境工程系,四川遂宁629000 [2]四川职业技术学院机械工程系,四川遂宁629000 [3]成都理工大学材料与化学化工学院,四川成都610059

出　　处：《热加工工艺》2017年第10期74-77,共4页Hot Working Technology

基　　金：四川省教育厅自然科学重点科研项目(15ZA0347);攀枝花市高新技术及产业化计划项目(2016CY-G-11)

摘　　要：利用透射电镜研究了蠕变变形(650~750℃,250~350 MPa)Ti-47 Al-2Nb-2Mn(at%)+0.8TiB_2(vol%)合金的微观组织及变形机制。结果表明,该合金的微观组织由等轴状γ相和(γ+α_2)区域组成;在层片状γ中,观察到1/2<110]普通位错外,还发现了层错。与化学计量比TiAl化合物中的结果不同,该富Ti的TiAl合金中所观察到的{111}层错是由1/6[112]和1/6[121]位错在{111}面的运动产生的。基于对该合金中层错形成机制的认识,本文探讨了合金元素Mn和Nb等对TiAl基合金变形机制的影响。The microstructure and deformation mechanism of Ti-47 Al-2Nb-2Mn （at%） ＋0.STiB2（vol%） alloy after creep deformation at temperature 650-750 ℃ under 250-350 MPa was studied by transmission electron microscopy （TEM）. The results indicate that the microstructure of the alloy consists of equiaxed γ phase and （γ＋α2） colonies. Ordinary 1/2〈110] dislocations are observed, and stacking faults （SF） are also found in the γ-laths. The stacking faults lying on {111} planes are generated by the movement of 1/6 [112] and 1/6 [121] dislocations on {111} phane in contrast to earlier results on stoichiometric binary TiA1 alloys. Based on the understanding of the formation process in the stacking faults, the effects of alloying elements such as Mn and Nb on the deformation mechanism of TiAl-based alloys were discussed.

关 键 词：TIAL合金 Γ相 透射电镜 层错 蠕变 

分 类 号：TG146.2[一般工业技术—材料科学与工程]