Mechanisms of Grain Refinement in Direct-Chill Casting 2024 Aluminum Alloy With Intensive Melt Shearing

doi:10.1007/s11661-022-06687-1

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	Mechanisms of Grain Refinement in Direct-Chill Casting 2024 Aluminum Alloy With Intensive Melt Shearing
	Liu, Xudong 1,4; Zhu, Qingfeng 2,3; Zhu, Cheng 2,3; Zuo, Yubo 2,3; Jiang, Haichang 1
刊名	METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
	2022-04-21
页码	9
ISSN号	1073-5623
DOI	10.1007/s11661-022-06687-1
通讯作者	Liu, Xudong(lxdong1992@126.com)
英文摘要	The mechanisms involved in the grain refinement of a 2024 aluminum alloy prepared by the direct-chill (DC) casting process with the introduction of intensive melt shearing were investigated through experiments and theoretical analyses. It was proven for the first time by theoretical calculations that the shear stress between the stator and rotor is capable of breaking the dendrite arms. In the experiment, 2024 aluminum alloy ingots (300 mm) were prepared with high-shear unit at different shear positions and rotation speeds. Furthermore, the temperature of the melt near the tip (the working part in the melt) of the high-shear unit and the variation in the melt temperature during solidification were measured. The experimental results reveal that during the casting process with intensive melt shearing, the melt is cooled to the liquidus temperature at a higher cooling rate than that in conventional DC casting. Moreover, when shearing is processed at a lower position with a higher rotation speed, the grain refining effect is significantly improved. It is suggested that when the melt around the tip is in the solid-liquid two-phase state in the DC casting, dendritic fragmentation is the dominant mechanism of the grain refinement.
资助项目	National Natural Science Foundation of China[51674078] ; National Natural Science Foundation of China[51374067]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000786495900003
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/172578]
专题	金属研究所_中国科学院金属研究所
通讯作者	Liu, Xudong
作者单位	1.Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110055, Peoples R China 2.Key Lab Electromagnet Proc Mat, Shenyang, Peoples R China 3.Coll Mat Sci & Engn, Shenyang, Peoples R China 4.Northeastern Univ, Key Lab Electromagnet Proc Mat, Minist Educ, Shenyang, Peoples R China
推荐引用方式 GB/T 7714	Liu, Xudong,Zhu, Qingfeng,Zhu, Cheng,et al. Mechanisms of Grain Refinement in Direct-Chill Casting 2024 Aluminum Alloy With Intensive Melt Shearing[J]. METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,2022:9.
APA	Liu, Xudong,Zhu, Qingfeng,Zhu, Cheng,Zuo, Yubo,&Jiang, Haichang.(2022).Mechanisms of Grain Refinement in Direct-Chill Casting 2024 Aluminum Alloy With Intensive Melt Shearing.METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,9.
MLA	Liu, Xudong,et al."Mechanisms of Grain Refinement in Direct-Chill Casting 2024 Aluminum Alloy With Intensive Melt Shearing".METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE (2022):9.