Effect of Melt Overheating on Structure and Mechanical Properties of Al-Mg-Si Cast Alloy

Metals

Ernst Ri¹  Evgeny Prusov²  Olga Prihodko³  Svetlana Smetanyuk⁴  Vladislav Deev⁵  Xizhang Chen⁶  Sergey Konovalov⁶ 

[1] Department of Foundry Engineering and Metal Technology, Pacific National University, 680042 Khabarovsk, Russia;Department of Functional and Constructional Materials Technology, Vladimir State University Named after Alexander and Nikolay Stoletovs, 600000 Vladimir, Russia;Department of Quality Management, Siberian State Industrial University, 654007 Novokuznetsk, Russia;Foundry Department, Siberian State University, 660041 Krasnoyarsk, Russia;School of Mechanical Engineering and Automation, Wuhan Textile University, Wuhan 430073, China;School of Mechanical and Electrical Engineering, Wenzhou University, Wenzhou 325035, China;

关键词: Al-Mg-Si alloy;    melt overheating;    superheat treatment;    microstructure;    grain refinement;    mechanical properties;   

DOI  :  10.3390/met11091353

来源: DOAJ

【 摘 要 】

The paper discusses the complex effect of melt overheating with subsequent fast cooling down to the pouring temperature on the crystallization process, microstructure and mechanical properties of Al-Mg-Si aluminum alloy. The results obtained facilitated the establishment of rational modes of melt overheating, leading to a significant change in the dispersion and morphology of structural components. In particular, with an increase in the melt overheating temperature to 900 °C with holding and subsequent rapid cooling to the casting temperature, a decrease in the average size of dendritic cells of the aluminum solid solution from 39 μm to 13 μm was observed. We also noticed the refinement of eutectic inclusions of the Mg₂Si phase with compact morphology. An increased level of mechanical properties was noted; the maximum values of tensile strength and elongation reached 228 MPa and 5.24%, respectively, which exceeded the initial values by 22.5% and 52.3%, correspondingly. The microhardness of the aluminum solid solution sequentially increased from 38.21 to 56.5 HV with an increase in the temperature during melt overheating. According to the EDS linear scanning, an increase in the superheat temperature of the melt is accompanied by an increase in the degree of saturation of the solid solution with magnesium.

【 授权许可】

Unknown