镍基单晶高温合金γ′的定向粗化机理  

A MECHANISM FOR DIRECTIONAL COARSENING OF γ′ PRECIPITATES IN SINGLE CRYSTAL NICKEL-BASE SUPERALLOYS

作　　者：彭志方[1] 任遥遥[1] 樊宝珍 燕平[2] 赵京晨[2] 王延庆[2] 孙家华[2] 

机构地区：[1]武汉水利电力大学材料工程系 [2]钢铁研究总院

出　　处：《金属学报》1999年第1期9-14,共6页Acta Metallurgica Sinica

基　　金：湖北省自然科学基金

摘　　要：研究了外应力作用下［００１］取向镍基单晶高温合金γ／γ′共格弹性应变各向异性及γ′定向粗化驱动力问题；针对γ′析出相由立方形演变成杆状、片状和块状筏形组织的实验现象，描述了γ′发生Ｐ型、Ｎ型和Ｐ－Ｎ型定向粗化时原子的扩散途径以及共格相界面的迁移行为；分析了γ′沿不同取向定向粗化时对总相界面能的贡献并讨论了γ′的纵向合并行为．The anisotropy of elastic strain at γ′/γ coherent interfaces and the driving force for γ′ directional coarsening in -oriented single crystal nickel base superalloys under externally applied stresses are studied. Based on the phenomenon of morphological evolution of γ′ from original cuboids to rafted rods, platelets and blocks, the way along which atomic diffusion occurs and the transport behavior of the coherent interfaces during P-type, N-type and P-N-type coarsening are described. The contribution of γ′ directional coarsening in different senses to the change of total interfacial energy and the longitudinal coalescence of γ′ are analyzed.

关 键 词：镍基 单晶 高温合金 定向粗化 错配度 原子扩散 

分 类 号：TG146.15[一般工业技术—材料科学与工程]