Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 18    No. 4    August 2008

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Microstructure evolution of semi-solid 2024 alloy during two-step reheating process
WANG Shun-cheng(王顺成), LI Yuan-yuan(李元元), CHEN Wei-ping(陈维平), ZHENG Xiao-ping(郑小平)

School of Mechanical Engineering and Automotive, South China University of Technology, Guangzhou 510640, China

Abstract: A two-step reheating process was proposed and applied to perform reheating experiments on the semi-solid 2024 alloy billet. In this process, the semi-solid billet was firstly heated over liquidus temperature and then isothermally held at solid-liquid zone temperature. Microstructure evolution of the semi-solid billet during two-step reheating was studied by optical microscope and compared with that during isothermal reheating. The results show that the remelting rate of the semi-solid billet during two-step reheating is faster than that during isothermal reheating. Under the same reheating time, the grains of the semi-solid billet reheated by two-step reheating process are finer and rounder than those by isothermal reheating process. The present experimental results indicate that accelerating the formation of liquid phase during the two-step reheating process can restrain the coalescence of grains to a certain extent, and thus refine the grain size and promote the grain spheroidization.


Key words: semi-solid metal; thixoforming; reheating; microstructure evolution; 2024 alloy

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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