Mg含量对挤压铸造Al-7Si-xMg合金时效行为和拉伸性能的影响（x = 0-0.8 wt. %）

IF 2.9 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materialia Pub Date : 2025-08-01 DOI:10.1016/j.mtla.2025.102508

Karthik Kumar , L. Hughes , U. Mahmud , Y.L. Chiu , I.P. Jones , R.Lakshmi Narayan , Jayant Jain

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引用次数: 0

摘要

本研究研究了添加Mg对挤压铸造Al-7Si-(x)Mg合金（x = 0-0.8 wt. %）的时效和拉伸性能的影响。结果表明，Mg含量的增加显著提高了合金的峰值硬度，时效10 h后Al-7Si-0.8Mg合金的最高硬度为149 HV。此外，研究表明，Mg的加入延缓了时效动力学，这可能是由于析出相的最佳数量密度和尺寸之间的相互作用，这需要更长的时效时间才能达到最大强化的最佳尺寸。合金的抗拉强度随Mg含量的增加而增加，经峰时效处理的Al-7Si-0.8Mg合金的抗拉强度达到337 MPa。随着Mg添加量的增加，硬度和强度的增加是由于时效过程中形成的Mg2Si析出物数量增加，阻碍了位错的移动。采用标准强化公式预测了各合金的屈服强度，结果表明，沉淀强化对合金屈服强度的贡献最大，其次是固溶强化。本研究还发现，峰时效样品中同时存在β′和β′相，表明这两种析出相具有联合强化作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Effect of Mg content on the aging behaviour and tensile properties of squeeze-cast Al-7Si-xMg alloys (x = 0–0.8 wt. %)

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Effect of Mg content on the aging behaviour and tensile properties of squeeze-cast Al-7Si-xMg alloys (x = 0–0.8 wt. %)

The present study investigates the effect of Mg addition on the aging and tensile behaviour of squeeze cast Al-7Si-(x)Mg alloys (x = 0–0.8 wt. %). The results show that increasing Mg content leads to a significant enhancement in the peak hardness of the alloys, with the maximum hardness of 149 HV observed for the Al-7Si-0.8Mg alloy after aging for 10 h. Additionally, the study reveals that Mg addition delays the aging kinetics, likely due to the interplay between the optimized number density and size of the precipitates, which require longer aging times to reach their optimal size for maximum strengthening. The tensile strength of the alloys increases with higher Mg content, with the peak-aged Al-7Si-0.8Mg alloy achieving a tensile strength of 337 MPa. The increase in hardness and strength with increasing Mg addition is attributed to the higher number of Mg₂Si precipitates formed during aging which hinder dislocation movement. The yield strength of all alloys was predicted using the standard strengthening formula, showing that precipitation strengthening contributes the maximum to the overall yield strength for all the alloys, followed by solid solution strengthening. The present study also reveals the presence of both the βʺ and the β precipitates in the peak-aged samples, suggesting a combined strengthening effect from both precipitates.

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来源期刊

Materialia MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

6.40

自引率

2.90%

发文量

345

审稿时长

36 days

期刊介绍： Materialia is a multidisciplinary journal of materials science and engineering that publishes original peer-reviewed research articles. Articles in Materialia advance the understanding of the relationship between processing, structure, property, and function of materials. Materialia publishes full-length research articles, review articles, and letters (short communications). In addition to receiving direct submissions, Materialia also accepts transfers from Acta Materialia, Inc. partner journals. Materialia offers authors the choice to publish on an open access model (with author fee), or on a subscription model (with no author fee).