Anisotropy and Deformation Mechanisms ofAs-Extruded Mg-3Zn-1Y Magnesium AlloyUnder High Strain Rates

doi:10.11900/0412.1961.2017.00147

Acta Metall Sin

2018, Vol. 54

Issue (4): 557-565 DOI: 10.11900/0412.1961.2017.00147

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Anisotropy and Deformation Mechanisms ofAs-Extruded Mg-3Zn-1Y Magnesium AlloyUnder High Strain Rates

Xudong LI, Pingli MAO(

), Yanyu LIU, Zheng LIU, Zhi WANG, Feng WANG

School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China

Cite this article:

Xudong LI, Pingli MAO, Yanyu LIU, Zheng LIU, Zhi WANG, Feng WANG. Anisotropy and Deformation Mechanisms ofAs-Extruded Mg-3Zn-1Y Magnesium AlloyUnder High Strain Rates. Acta Metall Sin, 2018, 54(4): 557-565.

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Abstract

As a very important design principle, the dynamic properties of materials attracted extensive attention in resent years and a bunch of works have been done concerning with the materials deformation behaviors under high strain rates. However, the dynamic behaviors of magnesium alloys are not through understood, especially the rare earth based magnesium alloys. In order to investigate the dynamic and anisotropic behavior under high strain rates deformation of as-extruded Mg-3Zn-1Y magnesium alloy, the split Hopkinson pressure bar (SHPB) apparatus was used to testing the true stress-true strain curves under the high strain rates of 1000, 1500 and 2200 s^-1 of as-extruded Mg-3Zn-1Y magnesium alloy. The OM and SEM were used to analysis the micorstructure evolution and fracture surface morphology of the alloy. The true reason behind the anisotropic phenomenon was revealed based on the deformation mechanism of highly basal-textured magnesium alloy. The results demonstrate that the as-extruded Mg-3Zn-1Y magnesium alloy exhibits pronounced anisotropy during compression according to the loading direction. The anisotropy of the as-extruded Mg-3Zn-1Y magnesium alloy are arised from the variety of the deformation mechanisms. When the loading direction is along extrusion direction, the predominant deformation mode changes from extension twinning at a lower strain to prismatic slip at a higher strain. While compressed along extrusion radial direction (ERD), the predominant deformation mode changes from contraction twinning to a coordination of basal and second order pyramidal slip with the increasing of strain.

Key words: magnesium alloy anisotropy high strain rate deformation mechanism

Received: 25 April 2017

ZTFLH:

TG146.2

Fund: Supported by Science and Technology Project of Shenyang (No.17-9-6-00)

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	Xudong LI
	Pingli MAO
	Yanyu LIU
	Zheng LIU
	Zhi WANG
	Feng WANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2017.00147 OR https://www.ams.org.cn/EN/Y2018/V54/I4/557

Fig.1 Schematic of sample cutting arrangement (ED—extrusion direction, ERD—extrusion radial direction)

Fig.2 OM images of microstructures in as-extruded Mg-3Zn-1Y magnesium alloy for samples ED (a) and ERD (b)

Fig.3 Compression true stress-true strain curves of as-extruded Mg-3Zn-1Y magnesium alloy at high strain rates under loading directions of ED (a) and ERD (b)

Fig.4 Relationships between yield strength and strain rate of as-extruded Mg-3Zn-1Y magnesium alloy under loading directions of ED and ERD

Fig.5 True stress-true strain curves of as-extruded Mg-3Zn-1Y magnesium alloy under different loading directions at low and high strain rates

Fig.6 Hardening rate-true strain curves of as-extruded Mg-3Zn-1Y magnesium alloy under loading directions of ED and ERD (σ—true stress, ε—true strain)

Fig.7 Relationships between impact absorbing work (E) and strain rates of as-extruded Mg-3Zn-1Y magnesium alloy under loading directions of ED and ERD

Fig.8 OM images of deformation microstructures in as-extruded Mg-3Zn-1Y alloy along ED loading direction at strain rates of 1000 s^-1 (a), 1500 s^-1 (b) and 2200 s^-1 (c)

Fig.9 OM images of deformation microstructures in Mg-3Zn-1Y alloy along ERD loading direction at strain rates of 1000 s^-1 (a), 1500 s^-1 (b) and 2200 s^-1 (c)

Fig.10 XRD spectra of as-extruded Mg-3Zn-1Y alloy for samples ED (a) and ERD (b)

Fig.11 Schematics of the relative relationship between the loading direction of as-extruded Mg-3Zn-1Y magnesium alloy and the c-axis of grain before (a, c) and after (b, d) compression along ED (a, b) and ERD (c, d) loading direction

Fig.12 Morphologies of compression fracture surfaces for as-extruded Mg-3Zn-1Y magnesium alloy along loading directions of ED (a) and ERD (b) at 2200 s^-1

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