粗晶Fe_3Al基合金在高温变形时显微组织演变机制  

Microstructure evolution of a Fe_3Al-based alloy with coarse initial grains deformed at elevated temperature

作　　者：王飞[1] 李龙飞[1] 杨王玥[2] 孙祖庆[1] 

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《北京科技大学学报》2007年第10期994-998,共5页Journal of University of Science and Technology Beijing

摘　　要：采用Gleeble1500型热模拟试验机进行单轴压缩实验,研究了Fe3Al基合金在温度为850℃、应变速率为10-3s-1条件下的组织演变.结果表明:在本实验变形条件下,Fe3Al基合金能够发生动态再结晶.变形初期,Fe3Al可以通过晶界弓弯机制形成动态再结晶核心,即发生了不连续动态再结晶现象,但再结晶核心不易长大.随着应变量的增加,通过连续动态再结晶形成一定量的再结晶细小晶粒.The microstructure evolution of a Fe3Al-based alloy was investigated by uniaxial compression tests on a Gleeble 1500 hot simulation test machine at 850 ℃ and a strain rate of 10^-3 s^-1. The results indicated that under the present deformation conditions the dynamic recrystallization of the Fe3Al-based alloy occurred. At low strain, the nuclei of dynamic recrystallization formed by bulging of initial grain boundaries, i.e. discontinuous dynamic recrystallization occurred; but the growth of the nuclei became more difficult with increasing strain. At large strain, finer dynamic recrvstallized grains formed by the process of continuous dynamic recrystallization.

关 键 词：FE3AL基合金 动态再结晶 弓弯 动态回复 亚结构 

分 类 号：TG111.7[金属学及工艺—物理冶金] TG141[金属学及工艺—金属学]