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固溶处理和时效处理对一种新型Al-Mg-Si合金力学性能及微观组织的影响

Effect of the Solid Solution and Aging Treatment on the Mechanical Properties and Microstructure of a Novel Al-Mg-Si Alloy.

作者信息

Chen Yan, Wei Wu, Zhao Yu, Shi Wei, Zhou Xiaorong, Rong Li, Wen Shengping, Wu Xiaolan, Gao Kunyuan, Huang Hui, Nie Zuoren

机构信息

Key Laboratory of Advanced Functional Materials, Education Ministry of China, Beijing University of Technology, Beijing 100124, China.

Institute of Corrosion Science and Technology, Guangzhou 510530, China.

出版信息

Materials (Basel). 2023 Nov 4;16(21):7036. doi: 10.3390/ma16217036.

DOI:10.3390/ma16217036
PMID:37959633
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10647692/
Abstract

A novel Al-Mg-Si aluminum alloy with the addition of the micro-alloying element Er and Zr that was promptly quenched after extrusion has been studied. The solid solution and aging treatment of the novel alloy are studied by observing the microstructure, mechanical properties, and strengthening mechanism. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques are employed to examine the changes in the microstructure resulting from various solid solution treatments and aging treatments. The best strengthening effect can be achieved when the solubility of the MgSi phase and precipitate β″ (MgSi phase) is at their maximum. The addition of Er and Zr elements promotes the precipitation of the β″ phase and makes the b″ phase more finely dispersed. The aging strengthening of alloys is a comprehensive effect of the dislocation cutting mechanism and bypass mechanism, the joint effect of diffusion strengthening of Al(Er,Zr) particles and the addition of Er and Zr elements promoting the precipitation strengthening of β″ phases. In this paper, by adding Er and Zr elements and exploring the optimal heat treatment system, the yield strength of the alloy reaches 437 MPa and the tensile strength reaches 453 MPa after solid solution treatment at 565 °C/30 min and aging at 175 °C/10 h.

摘要

研究了一种添加微合金元素铒（Er）和锆（Zr）的新型Al-Mg-Si铝合金，该合金在挤压后立即淬火。通过观察微观结构、力学性能和强化机制，对该新型合金的固溶处理和时效处理进行了研究。采用扫描电子显微镜（SEM）和透射电子显微镜（TEM）技术，研究了不同固溶处理和时效处理后微观结构的变化。当MgSi相和析出相β″（MgSi相）的溶解度达到最大值时，可获得最佳强化效果。铒和锆元素的添加促进了β″相的析出，并使b″相更细小弥散。合金的时效强化是位错切割机制和绕过机制的综合作用，Al(Er,Zr)粒子扩散强化与铒和锆元素添加促进β″相析出强化的共同作用。本文通过添加铒和锆元素并探索最佳热处理制度，合金在565℃/30min固溶处理和175℃/10h时效后，屈服强度达到437MPa，抗拉强度达到453MPa。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1073/10647692/8c1d0baf5add/materials-16-07036-g008.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1073/10647692/a651e2726f04/materials-16-07036-g002.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1073/10647692/8c1d0baf5add/materials-16-07036-g008.jpg

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