Effect of Short T6 Heat Treatment on the Thermal Conductivity and Mechanical Properties of Different Casting Processes Al-Si-Mg-Cu Alloys

The thermal conductivity of alloys is gradually becoming appreciated. It is often assumed that heat treatment can improve the thermal conductivity of Al-Si-Mg-Cu alloys, but there has been little relevant research. This paper studies the effects of different casting processes and short T6 heat treat...

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Bibliographic Details
Published in:Metals (Basel ) 2021-09, Vol.11 (9), p.1450
Main Authors: Dong, Zhong-Qiang, Wang, Jin-Guo, Guan, Zhi-Ping, Ma, Pin-Kui, Zhao, Po, Li, Zhu-Jin, Lu, Tian-Shi, Yan, Rui-Fang
Format: Article
Language:English
Subjects:
Al-Si-Mg-Cu alloy
Alloys
Aluminum base alloys
Aspect ratio
Casting alloys
Copper
Die casting
Electron transport
Foundry practice
Grain size
Heat conductivity
Heat transfer
Heat treatment
Magnesium base alloys
Mechanical properties
microstructure
Semisolids
Silicon
Solidification
Solids
Thermal conductivity
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Summary:The thermal conductivity of alloys is gradually becoming appreciated. It is often assumed that heat treatment can improve the thermal conductivity of Al-Si-Mg-Cu alloys, but there has been little relevant research. This paper studies the effects of different casting processes and short T6 heat treatment (ST6) on the thermal conductivity and mechanical properties of Al-Si-Mg-Cu alloys. The results show that a microstructure with fine α-Al crystal grains can be obtained by semi-solid die casting (SSDC), improving the mechanical properties of the Al-Si-Mg-Cu alloy in the as-cast state. After SSDC, the size and aspect ratio of eutectic silicon can be reduced by ST6 treatment, effectively improving the thermal conductivity and mechanical properties of the alloy. Finally, the influence of eutectic silicon on electron transport is analyzed in detail. With the SSDC + ST6 processing technology, Al-Si-Mg-Cu alloys with excellent thermal conductivity and mechanical properties can be obtained.
ISSN:2075-4701
2075-4701
DOI:10.3390/met11091450