Effect of ball-milling time on microstructures and mechanical properties of heterogeneity-improved heterostructured 2024Al alloys fabricated through powder thixoforming

doi:10.1016/j.matchemphys.2022.126684

	Effect of ball-milling time on microstructures and mechanical properties of heterogeneity-improved heterostructured 2024Al alloys fabricated through powder thixoforming
	Liu, G.F.; Chen, T.J.
刊名	Materials Chemistry and Physics
	2022-11-15
卷号	291
关键词	Aluminum alloys Ball milling Binary alloys Ductility Fabrication Grain refinement Milling (machining) Strain hardening Tensile strength Al-alloy Ball milling time Matrix alloy Milling time Powder thixoforming Solidified structures Strengthening mechanisms Structure domains Thixo-forming Toughening mechanisms
ISSN号	0254-0584
DOI	10.1016/j.matchemphys.2022.126684
英文摘要	In this study, several heterogeneity-improved heterostructured 2024Al alloys were fabricated by forming in situ Al3Ti particles through powder thixoforming. The results indicated that the inter-soft-domain distance (the size of primary grains) decreased and reached its minimum at the ball-milling time of 8 h, and then, slightly increased. The boundary density of primary-grain/secondarily solidified structure (SSSs) domains reached the maximum at this time. The resulting alloy exhibited the ultimate tensile strength, yield strength, and elongation to failure of 430 MPa, 275 MPa, and 8.03%, showing an enhancement of 41.9%, 36.1%, and 10%, respectively, compared with those of the 2024Al matrix alloy without Al3Ti particles. This alloy exhibited an excellent synergy of strength and ductility. Heterogeneity between the primary-grain and SSS domains of the alloy was considerably higher than that of the matrix alloy but slightly lower than that of the alloys prepared with the milling times of 2 and 10 h. This finding indicated that the alloy prepared at the milling time of 8 h exhibited a reasonably increased heterogeneity. Strength enhancement was attributed to the hetero-deformation-induced (HDI) strengthening, solution strengthening, grain refinement strengthening, and load transfer strengthening. The excellent ductility was mainly ascribed to the large strain partitioning due to the high boundary density of primary-grain/SSS domains, which led to an increase in the uniform elongation plateau with a high work hardening rate. © 2022 Elsevier B.V.
语种	英语
出版者	Elsevier Ltd
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/159718]
专题	材料科学与工程学院
作者单位	State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Liu, G.F.,Chen, T.J.. Effect of ball-milling time on microstructures and mechanical properties of heterogeneity-improved heterostructured 2024Al alloys fabricated through powder thixoforming[J]. Materials Chemistry and Physics,2022,291.
APA	Liu, G.F.,&Chen, T.J..(2022).Effect of ball-milling time on microstructures and mechanical properties of heterogeneity-improved heterostructured 2024Al alloys fabricated through powder thixoforming.Materials Chemistry and Physics,291.
MLA	Liu, G.F.,et al."Effect of ball-milling time on microstructures and mechanical properties of heterogeneity-improved heterostructured 2024Al alloys fabricated through powder thixoforming".Materials Chemistry and Physics 291(2022).