Detwinning Behaviors and Dynamic Mechanical Properties of Precompressed AZ31 Magnesium Alloy Subjected to High Strain Rates Impact

doi:10.11900/0412.1961.2021.00117

Acta Metall Sin

2022, Vol. 58

Issue (5): 660-672 DOI: 10.11900/0412.1961.2021.00117

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Detwinning Behaviors and Dynamic Mechanical Properties of Precompressed AZ31 Magnesium Alloy Subjected to High Strain Rates Impact

CHEN Yang, MAO Pingli(

), LIU Zheng, WANG Zhi, CAO Gengsheng

Key Laboratory of Magnesium Alloys and the Processing Technology of Liaoning Province, School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China

Cite this article:

CHEN Yang, MAO Pingli, LIU Zheng, WANG Zhi, CAO Gengsheng. Detwinning Behaviors and Dynamic Mechanical Properties of Precompressed AZ31 Magnesium Alloy Subjected to High Strain Rates Impact. Acta Metall Sin, 2022, 58(5): 660-672.

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Abstract

To investigate the detwinning behaviors and dynamic mechanical properties of a precompressed rolled AZ31 magnesium alloy sheet impacted under high strain rates, the as-received sheet was precompressed along the rolling direction (RD) to the true strain of 4% for inducing { $10 1 ¯ 2$ } tensile twins. The as-received and precompressed rolled AZ31 magnesium alloy sheets were impacted along the normal direction (ND) using a split Hopkinson pressure bar experiment apparatus at strain rates of 700, 1000, 1300, and 1600 s^-1. Microstructural characteristics of the as-received, precompressed, and impacted specimens were analyzed and compared by an electron backscatter diffraction technology. The results show that in the precompressed specimen, the density of the basal texture was weakened and a new twin texture with the c-axis paralled to RD was formed. The average grain size of the precompressed specimen decreased visibly as a result of the parent grains being subdivided by tensile twin boundaries. The dominant deformation mechanism of the precompressed rolled AZ31 magnesium alloy impacted along ND is detwinning. With increasing the strain rate, the initial basal texture recovered, the average grain size increased, and the average twin thickness decreased. Compared with the precompressed specimen, the as-received specimen impacted along ND exhibited higher strength and lower formability. The precompressed specimen demonstrated greater strain rate sensitivity during plastic deformation.

Key words: AZ31 magnesium alloy precompression high strain rate impact detwinning

Received: 23 March 2021

ZTFLH:

TG146.2

Fund: Liaoning Revitalization Talents Program(XLYC1908006)

About author: MAO Pingli, professor, Tel: 13940396212, E-mail: maopl@sut.edu.cn

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	Yang CHEN
	Pingli MAO
	Zheng LIU
	Zhi WANG
	Gengsheng CAO

URL:

https://www.ams.org.cn/EN/10.11900/0412.1961.2021.00117 OR https://www.ams.org.cn/EN/Y2022/V58/I5/660

Fig.1 EBSD analysis results of the rolled AZ31 magnesium alloy sheet after homogenization (TD and RD represent transverse direction and rolling direction of the sheet, respectively)
(a) inverse pole figure (b) grain boundary figure
(c) grain size distribution (d) {0001} pole figure
(e) misorientation angle distribution

Fig.2 EBSD analysis results of the rolled AZ31 magnesium alloy sheet precompressed along RD with a true strain of 4%
(a) inverse pole figure (b) grain boundary figure
(c) grain size distribution (d) {0001} pole figure
(e) misorientation angle distribution

Fig.3 Local enlarged figure of the rectangular region in Fig.2a (a) and misorientation angle distribution along the direction indicated by the arrow in Fig.3a (b)

Fig.4 EBSD analysis results of the precompressed rolled AZ31 magnesium alloy impacted along normal direction (ND) under the strain rate of 700 s^-1
(a) inverse pole figure (b) grain boundary figure
(c) grain size distribution (d) {0001} pole figure
(e) misorientation angle distribution

Fig.5 EBSD analysis results of the precompressed rolled AZ31 magnesium alloy impacted along ND under the strain rate of 1000 s^-1
(a) inverse pole figure (b) grain boundary figure
(c) grain size distribution (d) {0001} pole figure
(e) misorientation angle distribution

Fig.6 EBSD analysis results of the precompressed rolled AZ31 magnesium alloy specimen impacted along ND under the strain rate of 1300 s^-1
(a) inverse pole figure (b) grain boundary figure
(c) grain size distribution (d) {0001}pole figure
(e) misorientation angle distribution

Fig.7 EBSD analysis results of the precompressed rolled AZ31 magnesium alloy specimen impacted along ND under the strain rate of 1600 s^-1
(a) inverse pole figure (b) grain boundary figure
(c) grain size distribution (d) {0001}pole figure
(e) misorientation angle distribution

Fig.8 Number of tensile twins in precompressed rolled AZ31 magnesium alloy specimen (a) and impacted along ND under 700 s^-1 (b), 1000 s^-1 (c), 1300 s^-1 (d), and 1600 s^-1 (e)

Fig.9 Remaining tensile twin area fractions and twin thicknesses of the precompressed AZ31 magnesium alloy specimen impacted along ND under different strain rates

Fig.10 True stress-strain curves of the as-received (a) and precompressed (b) AZ31 magnesium alloy impacted along ND under different strain rates

Specimen	$ε ˙$ = 700 s^-1		$ε ˙$ = 1000 s^-1		$ε ˙$ = 1300 s^-1		$ε ˙$ = 1600 s^-1
	σ_s	σ_p	σ_s	σ_p	σ_s	σ_p	σ_s	σ_p
As-received	113.2	345.6	128.9	419.7	135.4	458.6	144.5	498.1
Precompressed	98.7	228.1	102.5	348.8	107.3	415.2	112.2	488.8

Table 1 Yield stress and peak stress of the as-received and precompressed AZ31 magnesium alloy specimen impacted along ND under different strain rates

Specimen	$ε$ = 0.005	$ε$ = 0.01	$ε$ = 0.025	$ε$ = 0.05	$m ¯$
As-received	0.227	0.269	0.232	0.166	0.224
Precompressed	0.301	0.179	0.295	0.438	0.303

Table 2 Strain rate sensitivity indexs of the as-received and precompressed AZ31 magnesium alloy specimen impacted along ND under different true strains (ε) at

ε ˙ 1

= 700 s^-1,

ε ˙ 2

= 1600 s^-1

Fig.11 Schematics showing the change of orientation during detwinning
(a) initial orientation (b) after precompression along RD (c) after impaction along ND

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