大晶粒FeAl合金超塑性变形的显微组织演变和变形激活能  

MICROSTRUCTURE EVOLUTION AND ACTIVIATION ENERGY IN SUPERPLASTICITY OF FeAl INTERMETALLIC ALLOYS

作　　者：郦定强[1] 林栋梁[1] 刘俊亮 刘毅 

机构地区：[1]上海交通大学国家教委高温材料及高温测试开放实验室,上海200030

出　　处：《金属学报》1997年第9期897-902,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金!59471064

摘　　要：本文对大晶粒FeAl金属间化合物超塑性变形的微观组织演变进行了研究，并测定了其超塑性变形激活能显微组织分析表明，合金的超塑性变形是一个晶粒变形、内部形成亚晶界、进而亚晶界向晶界转换，从而使晶粒得以细化的过程Fe－36．5Al，Fe－36.5Al-1Ti和Fe－36.5Al-2Ti合金变形激活能的测定值分别为370，290和260kJ·mol-1，大大低于其他的FeAl基合金的蠕变激活能。The microstructure evolution of large-grained FeAl intermetallic alloys during superplastic deformation has been investigated. The superplastic deformation exhibits characteristics of conventional grain-fining. During superplastic deformation, the shape of original grains changes significantly at first, then many subgrain boundaries form in the grains, and after that the misorientation of every two adjacent subgrains increases. In a whole,it results in the dramatical decrease of the grain size of FeAl alloys after the supefplastic deformation to fracture. The deformation activation energy was measured to be about 370,290 and 260 kJ. mo-1 for Fe-36.5Al, Fe-36.5Al-1Ti and Fe-36.5Al-2Ti alloys,respectively, which are much lower than the creep activation energy previously measured in FeAl alloys. Low deformation activation energy indicates that the superplastic deformation process may be controlled by subgrain boundary and grain boundary diffusion.

关 键 词：超塑性 显微组织 晶界 变形激活能 FEAL 

分 类 号：TG131[一般工业技术—材料科学与工程] TG115.52[金属学及工艺—合金]