High strain rate deformation mechanism of Mg–2.5Zn–4Y magnesium alloy containing LPSO phase

ABSTRACT

Dynamic compression experiments were carried out on Mg–2.5Zn–4Y magnesium alloy containing long period stacking ordered phase (LPSO) to understand its deformation mechanism using ‘Split Hopkinson Pressure Bar’. High strain rates ranging from 700 to 2100 s⁻¹ were applied along Extrusion Direction. The results demonstrate that maximum compression stress increases with increasing strain rate. In the mean the alloy shows a positive strain rate strengthening effect. The deformation mechanism of Mg–2.5Zn–4Y magnesium alloy with LPSO phase is mainly 〈c + a〉 pyramidal slip supplemented with deformation by extension twin in association with kinking of LPSO phase. The impact fracture surface of the investigated magnesium alloy suggested quasi-cleavage fracture.

KEYWORDS:

• Magnesium alloy
• strain rate
• deformation mechanism
• LPSO phase
• kink band

Acknowledgement

The authors would like to acknowledge the financial support from High level innovation team of Liaoning Province (XLYC1908006). Innovation Talent Program in Science and Technology for Young and Middle-aged Scientists of Shenyang (No.RC.180111), Project of Liaoning Education Department (No. LQGD2019002 and LJGD2019004), Liaoning nature fund guidance plan (No. 2019-ZD-0210), and Liaoning Revitalization Talents Program (No. XLYC1807021 and 1907007).

Disclosure statement

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

Additional information

Funding

This work was supported by Liaoning Province: [Grant Number XLYC1908006]; Innovation Talent Program in Science and Technology for Young and Middle-aged Scientists of Shenyang [Grant Number No.RC.180111]; Liaoning: [Grant Number No. XLYC1807021 and 1907007]; Liaoning nature fund guidance plan [Grant Number No. 2019-ZD-0210]; Project of Liaoning Education Department [Grant Number No. LQGD2019002 and LJGD2019004].