Al-Cu-Mg合金粉末在半固态的组织演变及晶粒粗化机制

doi:10.11896/cldb.22030231

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Abstract The Al-Cu-Mg alloy powder and its sintered body were heated to 833 K, 843 K, 853 K, 863 K, 873 K, 883 K and 893 K, respectively, and then were water-cooled to obtain their semi-solid microstructures after being held for 60 min, 50 min, 40 min, 30 min, 20 min, 10 min and 0 min, respectively. By calculating the grain size, shape factor and grain coarsening rate of the semi-solid powder and its sintered body, the grain coarsening mechanism of the powder and the dense material (with the same composition) at semi-solid state was compared and analyzed. The results show that with the increase of the semi-solid temperature and the holding time, the grain size of the powder increases. The temperature of Al-Cu-Mg alloy during semi-solid powder forming is recommended less than 883 K, and the holding time is supposed to be within 40 min. As the temperature increases, the coarsening rate of powder at a semisolid state increases, and the coarsening rate reaches 19 μm³/s at 883 K, which is much less than that of the dense material with the same composition, however. This is an important reason why the semi-solid powder forming technology can obtain fine microstructure.

Key words： Al-Cu-Mg alloy semi-solid powder microstructure evolution grain growth coarsening rate

Published: Online: 2023-01-03

CLC number:

TG306

Fund:Guangzhou City Science and Technology Plan Project(202102080110), Open Fund of National Engineering Research Center of Near-net-shape Forming Technology for Metallic Materials (2018006), Sichuan Provincial Science and Technology Plan(2020YFH0151) and National Natural Science Foundation of China (51704255).

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	Articles by authors
	WU Min
	LIU Jian
	LUO Xia
	LIU Yunzhong
	CAI Renye
	XU Wei
	CHEN Xiao

Cite this article:

WU Min,LIU Jian,LUO Xia, et al. Microstructure Evolution and Grain Coarsening Mechanism of Al-Cu-Mg Alloy Powder in Semi-solid State[J]. Materials Reports, 2022, 36(24): 22030231-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22030231 OR http://www.mater-rep.com/EN/Y2022/V36/I24/22030231

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