In-situ TEM study of dislocation emission associated with austenite growth
In-situ TEM study of dislocation emission associated with austenite growth
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与奥氏体生长相关的位错发射的原位 TEM 研究
DOI：
10.1016/j.scriptamat.2017.10.014
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发表时间：
2018-03-01
影响因子：
6
通讯作者：
Zhang, Wen-Zheng
中科院分区：
文献类型：
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作者：
Du, Juan;Mompiou, Frederic;Zhang, Wen-Zheng
在双相不锈钢中，用原位电子显微镜在760℃观察到了新转变的奥氏体板条尖端的位错发射，它与铁素体基质具有接近Pitsch取向的关系。详细分析了用[111](B)/2 Burgers矢量计算位错环的动力学过程。用位错作为应力探头，估算了尖端的应力集中。这些实时观测首次直接证实了位错活动有助于奥氏体析出物的生长，并为揭示界面迁移产生的应力场提供了定量数据。(C)2017 Acta Materialia Inc.由Elsevier Ltd.出版。保留所有权利。
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.