摘要
利用微观相场法模拟了新型Ni3Al(L12)-Ni3V(D022)双级复相金属间化合物合金的时效过程。结果表明:高温(1370 K)时效阶段形成上级结构L12+A1(Ni基固溶体),尺度为微米级;共析温度以下(1200 K)时效阶段形成下级结构L12+D022,尺度为亚微米级,两级时效处理后形成L12+(L12+D022)双级复相微观结构。低温时效阶段,在D022相析出所产生的弹性势作用下,D022/L12相界面由{001}转向{011},{011/2}型界面在时效末期数量占优,最终下级复相组织中的D022相与L12相呈层状相间分布。
Microscopic phase field method was employed to simulate the aging process of Ni3Al (L12)-Ni3V (D0_22) dual two-phase intermetallic alloy. The results show that the upper two-phase microstructure with a micron scale consisting of the prior A1 (Ni solid solution) and L12 phases are formed through high-temperature (1370 K) aging stage; prior A1 phase is decomposed into L12+D0_22 by a eutectoid reaction at low temperature(1200 K), resulting in the lower two-phase microstructure with a sub-micron scale, dual two-phase microstructure of L12+(L12+D0_22) is formed finally. Due to the elastic potential caused by precipitation of D0_22~ phase, DO_22/L12 interfacial plane rotates from {001 } to {011 } duing low-temperature aging stage and {011/2} dominate at last, the morphology of the lower two-phase microstructurepresents a lamellar-like form composed of L12 and D0_22 phases.
出处
《热加工工艺》
CSCD
北大核心
2012年第14期174-177,共4页
Hot Working Technology
基金
国家自然科学基金资助项目(51075335
10902086
50875217)
西北工业大学基础研究基金资助项目(NPU-FFR-JC201005)
关键词
双级复相
D022
微观相场
时效
dual two-phase
D0_22
microscopic phase field
aging