Microstructures and Formability of the As-Rolled Mg- xZn-0.5Er Alloy Sheets at Room Temperature

doi:10.11900/0412.1961.2021.00550

Acta Metall Sin

2023, Vol. 59

Issue (11): 1439-1447 DOI: 10.11900/0412.1961.2021.00550

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Microstructures and Formability of the As-Rolled Mg- xZn-0.5Er Alloy Sheets at Room Temperature

LOU Feng¹, LIU Ke¹(

), LIU Jinxue², DONG Hanwu³, LI Shubo¹, DU Wenbo¹

^1.Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China
^2.Zhengzhou Light Alloy Institute Co. Ltd., Zhengzhou 450041, China
^3.Key Laboratory of Advanced Forming of Metallic Materials, Chongqing Academy of Sciece and Technology, Chongqing 401123, China

Cite this article:

LOU Feng, LIU Ke, LIU Jinxue, DONG Hanwu, LI Shubo, DU Wenbo. Microstructures and Formability of the As-Rolled Mg- xZn-0.5Er Alloy Sheets at Room Temperature. Acta Metall Sin, 2023, 59(11): 1439-1447.

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Abstract

As lightweight requirements rise in transportation, aerospace, and other industries, magnesium alloys have a great application prospect. However, the low formability capabilities of magnesium alloys lead to a severe limit in applications. At present, there are many reports on the influences of texture and second phases on the formability of magnesium alloys at room temperature. Nevertheless, the dominant factors affecting the formability performance of magnesium alloys at room temperature are not clear. In this study, the development of the microstructures and texture of Mg-xZn-0.5Er (x = 0.5, 2.0, 3.0, 4.0, mass fraction, %) alloy sheets were studied, and the impact of the texture and second phases on the formability of these sheets were also investigated. The findings showed that the increase in Zn addition led to an early and complete dynamic recrystallization (DRX) in Mg-Zn-Er alloys sheets, and these recrystallized grains would expand significantly during subsequent hot rolling processes. These recrystallized grains with a large size were typically elongated and then helped to create a strong basal texture. Thus, it was discovered that the microstructures of these sheets were typically made up of equiaxed and elongated grains. The formability performance of these sheets was strongly related to the size of the second phases and the texture. The formability of the sheets containing microscopic second phases mainly depended on the basal texture, while the formability of the sheets which contained coarse second phases was mostly influenced by the second phases and basal texture. Particularly, when the component of the coarse second was larger, the formability would get more inferior due to the predominant role of the second phase at room temperature.

Key words: Mg-Zn-Er alloy dynamic recrystallization texture second phase formability

Received: 13 December 2021

ZTFLH:

TG146.22

Fund: National Key Research and Development Program of China(2021YFB3701100);Scientific Re-search Institution Performance Incentive and Guidance Special Project of Chongqing(cstc2021jxjl50004);Scientific Re-search Institution Performance Incentive and Guidance Special Project of Chongqing(cstc2021jxjl50004)

Corresponding Authors: LIU Ke, associate professor, Tel: (010)67392423, E-mail: lk@bjut.edu.cn

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	LOU Feng
	LIU Ke
	LIU Jinxue
	DONG Hanwu
	LI Shubo
	DU Wenbo

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https://www.ams.org.cn/EN/10.11900/0412.1961.2021.00550 OR https://www.ams.org.cn/EN/Y2023/V59/I11/1439

Fig.1 OM images of as-rolled Mg-0.5Zn-0.5Er (a, d, g, j), Mg-2.0Zn-0.5Er (b, e, h, k), and Mg-4.0Zn-0.5Er (c, f, i, l) alloys on the rolling direction-transverse direction (RD-TD) plane with thickness reductions of 25% (a-c), 44% (d-f), 54% (g-i), and 64% (j-l) (DRX—dynamic recrystallization)

Fig.2 EBSD analyses of Mg-2.0Zn-0.5Er alloy on the RD-normal direction (ND) plane with thickness reduction of 25%
(a) inverse pole figure (IPF)
(b1-b4) EBSD analyses of part 1 in Fig.2a for IPF (b1), {0001} pole figure (b2), and misorientation angle distributions (b3, b4) (TDRX—twin dynamic recrystallization)
(c1-c4) EBSD analyses of part 2 in Fig.2a for IPF (c1), misorientation angle distribution (c2), and {0001} pole figures (c3, c4)
(d1-d3) EBSD analyses of part 3 in Fig.2a for IPF (d1), distribution of misorientation along line L1 in Fig.2d1 (d2), and {0001} pole figure (d3)

Fig.3 EBSD analyses of Mg-2.0Zn-0.5Er alloy on the RD-ND plane with thickness reduction of 44%
(a) IPF and {0001} pole figure (inset)
(b) local enlarged IPF of the part 4 in Fig.3a (CDRX—continuous dynamic recrystallization)

Fig.4 OM images of as-rolled Mg-0.5Zn-0.5Er (a), Mg-2.0Zn-0.5Er (b), Mg-3.0Zn-0.5Er (c), and Mg-4.0Zn-0.5Er (d) alloys on the RD-TD plane with thickness reduction of 78%

Fig.5 EBSD images of Mg-0.5Zn-0.5Er (a), Mg-2.0Zn-0.5Er (b), Mg-3.0Zn-0.5Er (c), and Mg-4.0Zn-0.5Er (d) alloys on RD-ND plane with thickness reduction of 78%

Fig.6 Cupping formabilities of as-rolled Mg-0.5Zn-0.5Er (a), Mg-2.0Zn-0.5Er (b), Mg-3.0Zn-0.5Er (c), and Mg-4.0Zn-0.5Er (d) alloys with thickness reduction of 78% at room temperature

Fig.7 Failure analyses of cup test of as-rolled Mg-2.0Zn-0.5Er alloys
(a) cross-section image
(b1-b4) SEM images of areas 1-4 in Fig.7a, respectively
(c1-c4) IPFs of box areas in Figs.7b1-b4, respectively
(d1-d4) pole figures of Figs.7c1-c4, respectively

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