Deformation mechanisms in a Co-rich nickel based superalloy with different size of γ′ precipitates

被引：67
作者：
Fu, B. D. [1 ,2 ]
Du, K. [1 ]
Han, G. M. [3 ]
Cui, C. Y. [3 ]
Zhang, J. X. [2 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
[2] Shandong Univ, Jinan 250061, Peoples R China
[3] Chinese Acad Sci, Inst Met Res, Superalloys Div, Shenyang 110016, Peoples R China
来源：
MATERIALS LETTERS | 2015年 / 152卷
基金：
中国国家自然科学基金;
关键词：
Nickel based superalloy; Electron microscopy; Deformation mechanism; Microstructure; Precipitate size; MICROSTRUCTURE; ALLOYS; STRAIN; CREEP;
D O I：
10.1016/j.matlet.2015.03.142
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A Co-rich nickel based superalloy with different size of gamma' precipitates is obtained through varied aging time. Microstructures after tensile deformation at intermediate temperature are investigated by transmission electron microscopy. With the increasing gamma' precipitate size, the deformation mode of the alloy changes from cutting the precipitates by 1/2 < 110 > dislocation pairs to cutting by 1/6 < 112 > partial dislocations. Microtwinning occurs with high density of stacking faults, attributing to the low stacking fault energy of the alloy. With further increase of the precipitate size, the alloy starts to be deformed by Orowan bypassing mechanism. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：272 / 275
页数：4
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