触变成形Mg-5Sn-3Bi-2Cu合金微观组织与力学性能研究

doi:10.11896/cldb.24100030

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Abstract In order to reveal the microstructure and mechanical properties of thixoformed Mg-Sn-Bi alloys, fine-grained Mg-5Sn-3Bi-2Cu (TBC532) alloys were selected for semi-solid thixoforging. The microstructure and mechanical properties of thixoforged TBC532 alloy were studied by OM, SEM, XRD, EPMA and tensile test. The results indicate that a bimodal structure composed of near-spherical coarse grains and fine secon-dary solidification microstructure is formed in the thixoforged TBC532 alloy, significantly different from the equiaxed dendrites in the as-cast sample. The spherical α₁-Mg grains account for about 60.8% with average grain size and shape factor of～98.5 μm and 1.26, respectively. The se-condary solidification region is composed of greatly refined α₂-Mg with secondary dendrite arm spacing of ～4.6 μm and continuous network-like compound phases including Mg₃Bi₂, Mg₂Sn, Mg₂Cu, and BiSn. The secondary solidification region mainly distributed between spherical α₁-Mg grains. Besides, there is a small amount of secondary solidification microstructure located inside the spherical α₂-Mg grains. Due to the significant grain-boundary strengthening effect from fine α₂-Mg grains in the bimodal structure and the synergistic effect between coarse and fine grain regions, the thixoforged TBC532 alloy exhibits superior mechanical properties. The ultimate tensile strength and elongation are (292.3±5.2) MPa and (14.7±0.3)%, respectively, which are 17.0% and 36.1% higher than that of the as-cast sample, respectively. The fracture surface of the thixoforged TBC532 alloy displays transcrystalline and ductile features.

Key words： Mg-Sn-Bi alloy thixotropic processing heterostructure strengthening and toughening mechanism

Published: 10 January 2026 Online: 2026-01-09

CLC number:

TG146.22

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	MENG Shuaiju

Cite this article:

MENG Shuaiju. Study on Microstructure and Mechanical Properties of Thixoforged Mg-5Sn-3Bi-2Cu Alloy[J]. Materials Reports, 2026, 40(1): 24100030-5.

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https://www.mater-rep.com/EN/10.11896/cldb.24100030 OR https://www.mater-rep.com/EN/Y2026/V40/I1/24100030

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