热循环过程铁铬铝合金中α＇相沉淀  

Precipitation of α'-Phase in Fe-Cr-Al Alloy during Thermal Cycling Process

作　　者：杜国维[1] 曹慧泉[1] 蔡家敏[1] 马如璋[1] 

机构地区：[1]北京科技大学材料物理系,北京科技大学物理系

出　　处：《北京科技大学学报》1995年第4期387-390,共4页Journal of University of Science and Technology Beijing

摘　　要：通过１２００℃缓冷至室温热循环过程，由于铬组元非平衡偏聚，加快铬在Ｆｅ２５Ｃｒ５Ａｌ合金中向晶界扩散，并产生富铬的α＇相沿晶及晶内沉淀；相变导致合金脆化，在晶界可观察到微米级α＇相，并产生穿晶解理断裂失效破坏。By thermal cycling treatment from 1200℃ to room temperature, a considerable acceleration of Cr diffusion to grain boundaries in Fe25Cr5Al alloy occurred due to nonequilibrium Cr element segregation, and resulted in the precipitation of Cr -rich α' -phase at grain boundaries and within grains; micrometer scale of α'-phase was observed at the grain boundary, the phase transformation resulted in the failure of the alloy by a mode of transgranular deavage fracture.

关 键 词：解理断裂 相沉淀 铁铬铝合金 循环热处理 

分 类 号：TG13[一般工业技术—材料科学与工程] TG156.99[金属学及工艺—合金]