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

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.