Work

Effects of Cu and Mg alloying and low-temperature aging on microstructure characteristics and mechanical properties of heat treatment-free cast Al–Si–Cu–Mg alloys

Year: 2025

Type: article

Abstract: The effects of low-temperature aging and the Cu/Mg ratio at varying Cu and Mg concentrations on the microstructure and tensile characteristics of Al–Si–Cu–Mg alloys processed through different casting techniques were examined using Pandat thermodynamic calculation software. The results indicate that the as-cast Al–Si–Cu–Mg alloys exhibit multiple intermetallic phases, with their formation kinetics strongly dependent on both Cu/Mg ratios and elemental concentrations. Meanwhile, microstructural observations of T5-age alloys showed that different casting processes affect the morphology and distribution of the nano-precipitates, consequently governing the strength and plasticity of the alloys.Specifically, the Al–10Si–1Cu-0.6 Mg alloy (Cu/Mg = 1.7) demonstrated an optimal combination of strength and ductility, attributed to the refined size and content of its precipitates.

Source: Journal of Materials Research and Technology

DOI: 10.1016/j.jmrt.2025.04.268

Authors: Xinxin Ma, Yanpeng Pan, Liwen Chen, Hua Hou, Jibo Hou, Yuhong Zhao

Institutions: North University of China, Taiyuan University of Science and Technology, Liaoning Academy of Materials, University of Science and Technology Beijing

Language: English

Topic: Aluminum Alloy Microstructure Properties

Subfield: Aerospace Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,640

Funders: National Natural Science Foundation of China, National Defense Basic Scientific Research Program of China, Shanxi Provincial Key Research and Development Project