Fe-28Al-5Cr与Fe-28Al-5Cr-0.5Nb-0.1C合金的超塑性变形能力及特征  

THE SUPERPLASTICITY OF Fe-28Al-5Cr AND Fe-28Al-5Cr-0.5Nb-0.1C ALLOYS

作　　者：高德春[1] 杨王玥[1] 黄晓旭[2,3] 孙祖庆[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]Materials Research Department, Riso National Laboratory [3]Denmark

出　　处：《金属学报》2001年第3期291-295,共5页Acta Metallurgica Sinica

基　　金：863计划资助项目! 715-005-0121; Ford(o国)研究与发展基金资助项目! 971516

摘　　要：研究了 Ｆｅ－２８Ａｌ－５Ｃｒ（原子分数）与 Ｆｅ－２８Ａｌ－５Ｃｒ－０．５Ｎｂ－０．１Ｃ合金的高温变形行为，结果表明，在 ８５０ ℃左右，应变速率为 ８．３×１０－４ ｓ－１时，呈现一定的超塑性变形能力，延伸率分别达到 １４５％和 ２５４％；应变速率敏感指数 ｍ分别为 ０．４与 ０．３５；激活能分别为： ２４３ ｋＪ／ｍｏｌ与 ２１８ ｋＪ／ｍｏｌ．在变形过程中，位错堆积形成小角度晶界，并逐渐转变成大角度晶界，使粗大的原始晶粒细化．High temperature deformation behaviors of two Fe-28Al-5Cr based intermetallic alloys have been investigated. These alloys exhibit superplastic behavior within the temperature range from 750 ℃ to 950℃ at the strain rate of 8.3× 10-4 s-1. Maximum tensile elongations of 145% and 254% are obtained respectively. The deformation activation energies are measured to be about 243 kJ/mol for Fe-28Al-5Cr alloy and 218 kJ/mol for Fe-28Al-5Cr-0.5Nb-0.1C alloy. During high temperature tensile, the dislocations pile up to form sub-grain boundary or small angular grain boundary which refines the original coarse grains.

关 键 词：FE3AL基合金 超塑性 激活能 晶粒细化 延伸率 应变速率敏感指数 

分 类 号：TG113.253[金属学及工艺—物理冶金] TG132.32[金属学及工艺—金属学]