Microstructures of a single-crystal nickel-base superalloy after thermo-mechanical fatigue

被引：5

作者：

Wang, YC ^{[1
]}

Li, SX ^{[1
]}

Zhou, L ^{[1
]}

Ai, SH ^{[1
]}

Liu, F ^{[1
]}

Zhang, H ^{[1
]}

Wang, ZG ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China

来源：

PHILOSOPHICAL MAGAZINE | 2004年 / 84卷 / 31期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1080/14786430412331283064

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The microstructures of a single-crystal nickel-base superalloy were observed by transmission electron microscopy (TEM) before and after thermo-mechanical fatigue. Both dislocation configurations and gamma' precipitate morphologies under in-phase (IP) testing were found to be clearly different from those under out-of-phase (OP) testing. Under IP testing, dense hexagonal dislocation networks were found on the horizontal interfaces, and irregular dislocation networks on the vertical interfaces. With decreasing mechanical strain amplitude, rafting of gamma' precipitates was more pronounced. Under OP testing, no dislocation networks were found on the gamma/gamma' interfaces; also, gamma' precipitates were sheared by superlattice stacking faults, and were not clearly rafted. The characteristic dislocation networks and partials of the stacking fault are analysed and the rafting mechanism of the gamma' precipitates is discussed.

引用

页码：3335 / 3351

页数：17

共 28 条

[1]

ANTOLOVICH SD, 1981, METALL T A, V12, P973

[2]

Buffiere JY, 1996, SCRIPTA MATER, V34, P349, DOI 10.1016/S0956-716X(95)00550-F

[3] APPARENT AND EFFECTIVE CREEP PARAMETERS IN SINGLE-CRYSTALS OF A NICKEL-BASE SUPERALLOY .1. INCUBATION PERIOD [J].