Microstructural evolution of Mg–6Zn–0.6Zr alloy during high strain rate compression deformation

Abstract

In this study, the microstructural evolution and single magnesium cell deformation behaviour of extruded Mg–6Zn–0.6Zr alloy were investigated along the extrusion direction with strain rate at 1800 s⁻¹ using a split Hopkinson pressure bar apparatus. The microstructural evolution and deformation mechanism were studied by X-ray diffraction, electron back scatter diffraction, and transmission electron microscopy. Analysis of the microstructural evolution shows that $\{10\overline{1}2\}$<10$\overline{1}$0> tension twinning and (0001)<11$\overline{2}$0> basal plane slip were dominant when the strain was less than 6%, and $\{11\overline{2}2\}$<11$\overline{2}$3> pyramidal plane<c+a> slip was the major deformation mechanism when the strain exceeded 6%. In particular, the transformation process of single magnesium crystal cell during deformation was studied in detail.

KEYWORDS:

• Mg–6Zn–0.6Zr alloy
• high strain rate deformation
• microstructure evolution
• tension twinning
• non-basal slip

Acknowledgement

Thanks to the financial supports from Department of Science and Technology of Liaoning Province (No. 2019-ZD-0210), Youth Project of Liaoning Education Department (No. LQGD2019004 and LQGD 2019002), National Key Research and Development Programs: [No. SQ2020YFC200162-1], Liaoning Revitalization Talents Program (No. XLYC1907007 and XLYC1807021), High level innovation team of Liaoning Province (No. XLYC1908006) and Innovation Talent Program in Science and Technology for Young and Middle-aged Scientists of Shenyang (No. RC180111).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by Department of Science and Technology of Liaoning Province: [Grant Number 2019-ZD-0210]; Youth Project of Liaoning Education Department: [No. LJGD2019004 and LQGD 2019002]; National Key Research and Development Programs: [No. SQ2020YFC200162-1]; Liaoning Revitalization Talents Program: [No. XLYC1907007 and XLYC1807021]; High level innovation team of Liaoning Province: [No. XLYC1908006]; Innovation Talent Program in Science and Technology for Young and Middle-aged Scientists of Shenyang: [No. RC180111].