Effect of aluminum contents on the microstructure and mechanical properties of magnesium-aluminum-calcium alloys Einfluss von Aluminium auf das Gefüge und die mechanischen Eigenschaften von Magnesium-Aluminium-Calciumlegierungen

IF 1.1 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materialwissenschaft und Werkstofftechnik Pub Date : 2025-09-17 DOI:10.1002/mawe.70017

X. D. Yuan, C. Y. Zhang, H. P. Pan, Y. Liu, P. Liu, X. Y. Zhang

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Abstract

The effect of aluminum contents on the microstructure and mechanical properties of as-extruded magnesium-aluminum-calcium alloys was systematically investigated. The as-solid alloys with three aluminum contents contain block-shape calcium aluminide phases and aluminum-manganese intermetallic phases. Differently, the amounts of block-shape calcium aluminide phases and aluminum-manganese intermetallic phases increased with aluminum contents. During hot extrusion process, the block-shape calcium aluminide phases and aluminum-manganese intermetallic phases are fragmented into small pieces and aligned along the extrusion direction. Bimodal microstructures were obtained after extrusion, consisting of fine dynamically recrystallized grains and coarse deformed grains. The area fractions of dynamically recrystallized grains increased from 53 % to 65 % with aluminum contents increasing from 3.12 % to 5.21 %, due to the particle stimulated nucleation mechanism caused by block-shape aluminum-containing phases. The as-extruded magnesium-aluminum-calcium alloys show a strong basal fiber texture, which diminished as aluminum contents increase. The strength of as-extruded magnesium-aluminum-calcium alloys diminished as aluminum contents increased. The as-extruded magnesium-3.12 aluminum-2.65 calcium (wt.-%) alloy demonstrates a yield strength of 366 MPa and an ultimate tensile strength of 391 MPa. The exceptional high strengths are due to the ultrafine dynamically recrystallized grains stabilized by fragmented second phases, strong basal texture and high dislocation density.

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铝含量对镁-铝-钙合金的微观结构和机械性能的影响

系统研究了铝含量对挤压态镁铝钙合金组织和力学性能的影响。三种含铝量的固态合金含有块状的铝化钙相和铝锰金属间相。块状铝化钙相和铝锰金属间相的含量随铝含量的增加而增加。在热挤压过程中，块状的钙铝化物相和铝锰金属间相破碎成小块，并沿挤压方向排列。挤压后得到由细小动态再结晶晶粒和粗大变形晶粒组成的双峰组织。随着铝含量从3.12%增加到5.21%，动态再结晶晶粒的面积分数从53%增加到65%，这是由于块状含铝相引起的颗粒激发成核机制所致。挤压态镁铝钙合金呈现出较强的基纤维织构，随着铝含量的增加，基纤维织构逐渐减弱。挤压态镁铝钙合金的强度随铝含量的增加而降低。挤压态镁-3.12铝-2.65钙（wt.-%）合金的屈服强度为366 MPa，抗拉强度为391 MPa。超常的高强度是由破碎的第二相稳定的超细动态再结晶晶粒、强基织构和高位错密度造成的。

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来源期刊

Materialwissenschaft und Werkstofftechnik 工程技术-材料科学：综合

CiteScore

2.10

自引率

9.10%

发文量

154

审稿时长

4-8 weeks

期刊介绍： Materialwissenschaft und Werkstofftechnik provides fundamental and practical information for those concerned with materials development, manufacture, and testing. Both technical and economic aspects are taken into consideration in order to facilitate choice of the material that best suits the purpose at hand. Review articles summarize new developments and offer fresh insight into the various aspects of the discipline. Recent results regarding material selection, use and testing are described in original articles, which also deal with failure treatment and investigation. Abstracts of new publications from other journals as well as lectures presented at meetings and reports about forthcoming events round off the journal.