Al-Zn-Mg-Cu合金中新型Al3Zr-η核壳粒子的透射电镜观察

IF 0.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

稀有金属材料与工程 Pub Date : 2018-11-01 DOI:10.1016/S1875-5372(18)30231-5

Liu Fei, Bai Pucun, Hou Xiaohu, Tong Naiqiang, Cui Xiaoming

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引用次数: 4

摘要

采用高分辨率透射电镜(HRTEM)和选择区域电子衍射(SAED)观察了Al-12Zn-2.4Mg-1.1Cu-0.5Ni-0.2Zr合金中存在Al3Zr-η′核壳粒子。Al基体中存在两种类型的Al3Zr颗粒:一种是与基体共融的独立Al3Zr颗粒，另一种是作为η′析出相的核位的作为核心的Al3Zr颗粒，形成与基体半共融的核壳颗粒。壳层由4种η′相组成。Al3Zr熔芯中应变小于Al3Zr熔芯中应变，且在η′析出相与基体之间的界面区域存在大量应变。

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Transmission Electron Microscopic Observation of a Novel Al3Zr-η′ Core-shell Particle in Al-Zn-Mg-Cu Alloy

The Al₃Zr-η′ core-shell particles were observed in the Al-12Zn-2.4Mg-1.1Cu-0.5Ni-0.2Zr alloy using high-resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED). Two types of Al₃Zr particles appear in the Al matrix: one is a standalone Al₃Zr particle that is coherent with the matrix, and the other is an as-core Al₃Zr particle acting as a nucleation site of the η′ precipitates, resulting in a core-shell particle which is semi-coherent with the matrix. The shell is composed of η′ precipitates with four variants. The strain in the as-core Al₃Zr is lower than that in the standalone Al₃Zr, and a considerable amount of strain exists across the interfacial regions between the η′ precipitates and the matrix.