Atomic-scale mechanism of the θ’’→θ’ phase transformation in Al-Cu alloys
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2017年第10期
论文作者：Zhenju Shen Qingqing Ding Chunhui Liu Jiangwei Wang He Tian Jixue Li Ze Zhang
文章页码：1159 - 1164
摘 要：The phase transformation of θ’’→θ’ in an Al-5.7 Cu alloy was investigated by aberration-corrected scanning transmission electron microscopy, and the tranformation mode of θ’’→θ’ during aging treatment was clarified. In the presence of the θ’ phases, θ’ was found to be formed by in-situ transformation fromθ’’ with the same plate shape, size and broad faces. The transformation starts from multiple sites within the θ’ precipitate and the whole θ’ phase finally forms as the preferential θ’ sections grow and connect with each other. Antiphase domain boundaries are also found in some θ’ precipitates when the disregistry exists between different θ’ sections.
Zhenju Shen1，Qingqing Ding1，Chunhui Liu2，Jiangwei Wang1，He Tian1，Jixue Li1，Ze Zhang1,3
1. Center of Electron Microscopy, Zhejiang University2. Center for High-Resolution Electron Microscopy, College of Materials Science and Engineering, Hunan University3. State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University
摘 要：The phase transformation of θ’’→θ’ in an Al-5.7 Cu alloy was investigated by aberration-corrected scanning transmission electron microscopy, and the tranformation mode of θ’’→θ’ during aging treatment was clarified. In the presence of the θ’ phases, θ’ was found to be formed by in-situ transformation fromθ’’ with the same plate shape, size and broad faces. The transformation starts from multiple sites within the θ’ precipitate and the whole θ’ phase finally forms as the preferential θ’ sections grow and connect with each other. Antiphase domain boundaries are also found in some θ’ precipitates when the disregistry exists between different θ’ sections.
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