FGH95合金再结晶界面与晶内析出γ′相的作用

The Interaction of Recrystallizing Interfaces with Precipitates in A P / M Nickel-Base Superalloy

研究了高体积百分数γ＇相强化的粉末镍基高温合金在形变过程中发生再结晶行为。实验表明:在γ＇相溶解温度以上再结晶以应变诱发界面迁移方式进行。在γ＇溶解温度以下,γ相再结晶以亚晶粒粗化形核方式进行。在γ相再结晶的内界面上可能发生γ＇相的分解和随后的再析出。

Recrystallization behaviors of a P / M nickel-base superalloy with high volume percent of γ' phase have been studied. It is shown that above the dissolution tempreature of γ' phase a mechanism for the nucleation is the grain boundary migration induced by strain, below this tempreature, mechanism is the coarseing of the subgrain. Complete decomposition of the γ' phase can occur with subsequent reprecipitation at the recrystallizing interfaces. The migration activation energy of recrystallizing interfaces of 7 phase was 635kJ / mol.