In-situ TEM study of dislocation emission associated with austenite growth

被引：17

作者：

Du, Juan ^{[1
]}

Mompiou, Frederic ^{[2
]}

Zhang, Wen-Zheng ^{[1
]}

机构：

[1] Tsinghua Univ, Sch Mat Sci & Engn, Key Lab Adv Mat MOE, Beijing 100084, Peoples R China

[2] Univ Toulouse, CNRS, CEMES, 29 Rue J Marvig, F-31055 Toulouse, France

来源：

SCRIPTA MATERIALIA | 2018年 / 145卷

基金：

中国国家自然科学基金;

关键词：

In-situ TEM; Dislocation emission; Pitsch OR; Austenite/ferrite interface; WT-PERCENT CR; DUPLEX STAINLESS-STEEL; FCC-BCC INTERFACES; INVARIANT LINE; INTERPHASE BOUNDARY; ALLOY; CU; TRANSFORMATION; MATRIX; STRAIN;

D O I：

10.1016/j.scriptamat.2017.10.014

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The emission of dislocations from the tip of a newly transformed austenite lath, with a near Pitsch orientation relationship with the ferrite matrix, was observed at 760 degrees C in a duplex stainless steel, using in-situ transmission electron microscopy. The dynamics of dislocation loops with [111](b)/2 Burgers vector were carefully analyzed. An estimation of stress concentration at the tip was made using dislocations as stress probes. These real-time observations verify directly for the first time that dislocation activity assists the growth of austenite precipitates, and provide quantitative data for revealing the stress field generated by interface migration. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：62 / 66

页数：5

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