Study of HCP→FCC phase transformation mechanism under different hot compression rates of AZ31 magnesium alloy

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys Pub Date : 2024-09-01 DOI:10.1016/j.jma.2023.02.012

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引用次数: 0

Abstract

At present, there are few studies on the phase transition during the thermocompression plastic deformation of magnesium alloy. In this study, the evolution model of thermal compression plastic of AZ31 magnesium alloy was constructed by molecular dynamics, and the phase transition relationship between HCP and FCC at different thermal compression rates was studied. By combining GLEEBLE thermal compression experiment with transmission electron microscopy experiment, high-resolution transmission electron microscopy images were taken to analyze the transition rules between HCP and FCC during plastic deformation at different thermal compression rates, and the accuracy of molecular dynamics analysis was verified. It is found that the slip of Shockley's incomplete dislocation produces obvious HCP →FCC phase transition at low strain rate and base plane dislocation at high strain rate, which makes the amorphous phase transition of HCP→OTHER more obvious, which provides theoretical guidance for the formulation of forming mechanism and preparation process of magnesium alloy.

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不同热压缩率下AZ31镁合金HCP→FCC相变机理研究

目前，有关镁合金热压塑性变形过程中相变的研究较少。本研究采用分子动力学方法构建了 AZ31 镁合金热压缩塑性演变模型，研究了不同热压缩率下 HCP 与 FCC 的相变关系。通过将 GLEEBLE 热压缩实验与透射电镜实验相结合，拍摄高分辨率透射电镜图像，分析了不同热压缩率下塑性变形过程中 HCP 与 FCC 的转变规律，验证了分子动力学分析的准确性。研究发现，肖克利不完全位错的滑移在低应变速率下产生明显的HCP→FCC相变，在高应变速率下产生基面位错，使得HCP→OTHER的非晶相变更加明显，为镁合金成形机理和制备工艺的制定提供了理论指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Magnesium and Alloys Engineering-Mechanics of Materials

CiteScore

20.20

自引率

14.80%

发文量

审稿时长

59 days

期刊介绍： The Journal of Magnesium and Alloys serves as a global platform for both theoretical and experimental studies in magnesium science and engineering. It welcomes submissions investigating various scientific and engineering factors impacting the metallurgy, processing, microstructure, properties, and applications of magnesium and alloys. The journal covers all aspects of magnesium and alloy research, including raw materials, alloy casting, extrusion and deformation, corrosion and surface treatment, joining and machining, simulation and modeling, microstructure evolution and mechanical properties, new alloy development, magnesium-based composites, bio-materials and energy materials, applications, and recycling.