LPSC AZ91Sb镁合金的组织与力学性能

IF 1.3 4区材料科学 Q3 METALLURGY & METALLURGICAL ENGINEERING

International Journal of Cast Metals Research Pub Date : 2022-11-02 DOI:10.1080/13640461.2023.2172371

Fusheng Pan, Han Lin, Ming-bo Yang, H. Tang

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引用次数: 0

摘要

研究了采用低压壳铸造（LPSC）工艺制备的AZ91Sb镁合金在不同条件下的组织和力学性能。铸态合金表现出良好的内部质量和致密的组织。α-Mg相的微观结构表现为树枝状，细小的分离的β-Mg17Al12颗粒相均匀分布在基体中。在415°C下固溶处理12小时后，几乎β-Mg17Al12相溶解到基体中。在200°C下时效处理14小时后，LPSC合金达到峰值硬度，时效硬化动力学受到抑制。不连续的沉淀物在晶界处开始，然后在晶粒内部发生连续的沉淀物。与重力铸造（GC）工艺合金相比，LPSC合金在铸态和热处理合金中都表现出更高的机械性能。

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Microstructure and mechanical properties of LPSC AZ91-Sb magnesium alloy

ABSTRACT Microstructures and mechanical properties of AZ91-Sb magnesium alloy fabricated by low-pressure shell casting (LPSC) process in different conditions were investigated. The as-cast alloy exhibited a good internal quality and denser structure. The microstructure of α-Mg phases displayed dendritic feature and fine isolated β-Mg17Al12 particles phases uniformly distributed in the matrix. After the solution treatment at 415°C for 12 h, almost β-Mg17Al12 phases dissolved into the matrix. After ageing treatment at 200°C for 14 h, the LPSC alloy attained the peak hardness with restrained age-hardening kinetics. The discontinuous precipitates initiated at the grain boundaries and then continuous precipitates occurred in the grain interior. The LPSC alloy exhibits higher mechanical properties in both as-cast and heat-treated alloys compared with the gravity casting (GC) process alloy.

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来源期刊

International Journal of Cast Metals Research 工程技术-冶金工程

CiteScore

2.70

自引率

7.10%

发文量

审稿时长

7.5 months

期刊介绍： The International Journal of Cast Metals Research is devoted to the dissemination of peer reviewed information on the science and engineering of cast metals, solidification and casting processes. Assured production of high integrity castings requires an integrated approach that optimises casting, mould and gating design; mould materials and binders; alloy composition and microstructure; metal melting, modification and handling; dimensional control; and finishing and post-treatment of the casting. The Journal reports advances in both the fundamental science and materials and production engineering contributing to the successful manufacture of fit for purpose castings.