Core structure and strengthening mechanism of the misfit dislocation in nickel-based superalloys during high-temperature and low-stress creep

被引：9
作者：
Ma, Shiyu [1 ]
Lv, Xianzi [1 ]
Zhang, Jianxin [1 ]
Zhang, Youjian [1 ]
Li, Pan [1 ]
Jin, Huixin [1 ]
Zhang, Wenyang [1 ]
Li, Xueqiao [2 ]
Mao, Shengcheng [2 ]
机构：
[1] Shandong Univ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Minist Educ, Jinan 250061, Shandong, Peoples R China
[2] Beijing Univ Technol, Beijing Key Lab Microstruct & Property Adv Mat, Beijing 100024, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2018年 / 743卷
基金：
中国国家自然科学基金;
关键词：
Nickel based superalloys; High-temperature and low-stress creep; Misfit dislocation; Core structure; Stress distribution; Strengthening mechanism; SINGLE-CRYSTAL SUPERALLOY; NI-BASED SUPERALLOYS; INTERFACIAL DISLOCATIONS; GAMMA'-PHASE; MICROSTRUCTURE; ADDITIONS; EVOLUTION; GEOMETRY; NETWORK; MOTION;
D O I：
10.1016/j.jallcom.2018.01.323
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Misfit dislocation structures are investigated in a nickel-based single crystal superalloy subjected to 38.8 h creep at 1100 degrees C and 130 MPa using conventional and high resolution transmission electron microscopy (HRTEM). The misfit dislocation was identified as an uncommon one with Burgers vector b = a/2[(2) over bar 11], which can be described as inserting (or extracting) one (1 (1) over bar1) half plane and one (11 (1) over bar) half plane. This dislocation was decomposed into two partial dislocations b(1) and b(2), with b(1) = a/2[(1) over bar 01] and b(2) = a/2[(2) over bar 11]. Partial dislocations b(1) and b(2) were arranged in a "V" shape, connected by the antiphase boundary (APB), which could hinder the dislocation motion to achieve the effect of dislocation enhancement. (c) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码：372 / 376
页数：5
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