Effect of Mg/Si mass ratio on microstructure and mechanical properties of Al-Mg-Si cast aluminum alloy

被引：0

作者：

Jia-yan Chen ^{[1
]}

Ce Zheng ^{[2
]}

Cheng Zhu ^{[2
]}

Ying-ju Li ^{[2
]}

Tian-jiao Luo ^{[2
]}

Cui-rong Liu ^{[2
]}

Shao-qiang Xu ^{[1
]}

Yuan-sheng Yang ^{[3
]}

机构：

[1] School of Material Science and Engineering, Taiyuan University of Science and Technology, Taiyuan

[2] Shi-changxu Innovation Center for Advanced Material, Institute of Metal Research, Chinese Academy of Sciences, Shenyang

[3] Preparatory Department, Modern College of Humanities and Sciences, Shanxi Normal University, Shanxi, Linfen

[4] WQ & UCAS (Binzhou) Industrialization Research Institute Co., Ltd., Shandong, Binzhou

来源：

China Foundry | 2025年 / 22卷 / 2期

关键词：

Al-Mg-Si casting alloys; dendrite arm spacing; mechanical properties; Mg/Si mass ratio; Mg[!sub]2[!/sub]Si phase;

D O I：

10.1007/s41230-025-3107-4

中图分类号：

学科分类号：

摘要：

The effect of Mg/Si mass ratio on the microstructure and mechanical properties of Al-Mg-Si cast aluminum alloys under sub-rapid solidification conditions was investigated. This study utilized four different Mg/Si ratios: 2.83, 1.91, 1.73, and 1.53. To analyze the evolution of the microstructure, particularly the second phase, various techniques were employed: optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), and electron backscatter diffraction (EBSD). Additionally, thermodynamic calculations were performed using the Thermal-calc software to further understand the microstructural changes. Results show that as the Mg/Si ratio decreases from 2.83 to 1.53, α-Al grains become more uniformly distributed. Meanwhile, the morphology of the Mg2Si phases changes from skeletal to short stick shapes with a decreasing aspect ratio. An as-cast Al-Mg-Si alloy with a Mg/Si ratio of 1.53 exhibits high strength, achieving an ultimate tensile strength (UTS) of 320.6 MPa and a yield strength (YS) of 249.9 MPa. The cast alloy with a Mg/Si ratio of 2.83 exhibits the highest elongation, reaching 5.31%. This superior elongation is attributed to the uniform distribution of Mg2Si phases, which possess a long skeletal shape. Conversely, the alloy with a Mg/Si ratio of 1.53 demonstrates the lowest elongation, primarily due to the central concentration of Mg2Si phases, which are characterized by their short stick shapes. Copyright © 2025 Foundry Journal Agency.

引用

页码：163 / 172

页数：9

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