Unveiling the formation of basal texture variations based on twinning and dynamic recrystallization in AZ31 magnesium alloy during extrusion

doi:10.1016/j.actamat.2018.07.014

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	Unveiling the formation of basal texture variations based on twinning and dynamic recrystallization in AZ31 magnesium alloy during extrusion
	Jiang, MG ; Xu, C ; Yan, H ; Fan, GH ; Nakata, T ; Lao, CS ; Chen, RS ; Kamado, S ; Han, EH ; Lu, BH
刊名	ACTA MATERIALIA
	2018-09-15
卷号	157 页码:53-71
关键词	Magnesium alloy Extrusion Basal texture Twinning Recrystallization
ISSN号	1359-6454
DOI	10.1016/j.actamat.2018.07.014
英文摘要	Commercial Mg extrusions usually develop various types of basal textures, affecting the formability and mechanical properties. The mechanisms for the formation of basal texture variations were systematically investigated for the first time based on the twinning and dynamic recrystallization (DRX) during extrusion using electron back-scatter diffraction (EBSD) characterization. The results indicate that {10 (1) over bar2} extension twins with various variants played a key role in the formation of [10 (1) over bar0] fiber texture, while twin-induced DRX mechanism associated with {10 (1) over bar1} twins made a limited contribution to overall texture evolution. The microstructure developed consecutively as a result of continuous DRX (CDRX) and discontinuous DRX (DDRX) after twinning with different nucleation of new orientations. In the unDRXed region, new DRXed grains with 30 degrees [0001] GBs preferentially nucleated via CDRX, forming preferred selection of [2 (11) over bar0] fiber orientation. Consequently, [10 (1) over bar0] fiber texture became weakened with [2 (11) over bar0] fiber component strengthening, progressively leading to the development of [10 (1) over bar0]-[2 (11) over bar0] double fiber texture. In the DRXed region, DDRX further occurred along the serrated grain boundaries and at the triple junctions of the parent grains by bulging, forming fresh DRXed grains without preferred orientation selection. Thus, the [10 (1) over bar0]-[2 (11) over bar0] double fiber texture became randomized and gradually transformed into non-fiber texture at the late stage of extrusion. Besides, typical nucleation sites for DRX and subsequent grain growth were also discussed in this study. These findings unveil that basal texture variations are attributed to the twinning and DRX mechanisms during extrusion, which leads to new insight to design new wrought Mg alloys with high performance by grain refinement and texture modification. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
学科主题	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种	英语
WOS记录号	WOS:000445318800006
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79961]
专题	金属研究所_中国科学院金属研究所
作者单位	1.[Jiang, M. G. 2.Lao, C. S.] Shenzhen Univ, Coll Mechatron & Control Engn, 3688 Nanhai Ave, Shenzhen 518060, Peoples R China 3.[Jiang, M. G. 4.Yan, H. 5.Chen, R. S. 6.Han, E. H.] Chinese Acad Sci, Inst Met Res, Grp Magnesium Alloys & Their Applicat, 62 Wencui Rd, Shenyang 110016, Liaoning, Peoples R China 7.[Xu, C. 8.Fan, G. H.] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Heilongjiang, Peoples R China 9.[Nakata, T. 10.Kamado, S.] Nagaoka Univ Technol, Dept Mech Engn, Nagaoka, Niigata 9402188, Japan
推荐引用方式 GB/T 7714	Jiang, MG,Xu, C,Yan, H,et al. Unveiling the formation of basal texture variations based on twinning and dynamic recrystallization in AZ31 magnesium alloy during extrusion[J]. ACTA MATERIALIA,2018,157:53-71.
APA	Jiang, MG.,Xu, C.,Yan, H.,Fan, GH.,Nakata, T.,...&Lu, BH.(2018).Unveiling the formation of basal texture variations based on twinning and dynamic recrystallization in AZ31 magnesium alloy during extrusion.ACTA MATERIALIA,157,53-71.
MLA	Jiang, MG,et al."Unveiling the formation of basal texture variations based on twinning and dynamic recrystallization in AZ31 magnesium alloy during extrusion".ACTA MATERIALIA 157(2018):53-71.