Microstructure Evolution and Mechanical Properties of Al-Cu-Mg Alloys with Si Addition

被引：7

作者：

Shah, Abdul Wahid ^{[1
,2
]}

Ha, Seong-Ho ^{[2
]}

Siddique, Jabir Ali ^{[1
,2
]}

Kim, Bong-Hwan ^{[1
,2
]}

Yoon, Young-Ok ^{[2
]}

Lim, Hyun-Kyu ^{[2
]}

Kim, Shae K. ^{[1
,2
]}

机构：

[1] Univ Sci & Technol, Ind Technol, Daejeon 34113, South Korea

[2] Korea Inst Ind Technol, Ind Mat Proc R&D Dept, Incheon 21999, South Korea

来源：

MATERIALS | 2023年 / 16卷 / 07期

关键词：

Al-Cu-Mg alloy; Si addition; microstructure; heat treatment; tensile properties; PHASE; IRON; AG;

D O I：

10.3390/ma16072783

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The aim of this study was to investigate the impact of the addition of a minor quantity of Si on the microstructure evolution, heat treatment response, and mechanical properties of the Al-4.5Cu-0.15Ti-3.0Mg alloy. The microstructure analysis of the base alloy revealed the presence of a-Al grains, eutectic a-Al-Al2CuMg (S) phases, and Mg-32(Al, Cu)(49) (T) phases within the Al grains. In contrast, the Si-added alloy featured the eutectic a-Al-Mg2Si phases, eutectic a-Al-S-Mg2Si, and Ti-Si-based intermetallic compounds in addition to the aforementioned phases. The study found that the Si-added alloy had a greater quantity of T phase in comparison to the base alloy, which was attributed to the promotion of T phase precipitation facilitated by the inclusion of Si. Additionally, Si facilitated the formation of S phase during aging treatment, thereby accelerating the precipitation-hardening response of the Si-added alloy. The as-cast temper of the base alloy displayed a yield strength of roughly 153 MPa, which increased to 170 MPa in the Si-added alloy. As a result of the aging treatment, both alloys exhibited a notable increase in tensile strength, which was ascribed to the precipitation of S phases. In the T6 temper, the base alloy exhibited a yield strength of 270 MPa, while the Si-added alloy exhibited a significantly higher yield strength of 324 MPa. This novel Si-added alloy demonstrated superior tensile properties compared to many commercially available high-Mg-added Al-Cu-Mg alloys, making it a potential replacement for such alloys in various applications within the aerospace and automotive industries.

引用

页数：13

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