Comparison of Thermal Deformation Behavior and Characteristics of Mg-Gd-Y-Zn Alloys with and without Bulk LPSO Phase

Author:

Chen Dongjie1,Wang Qi1,Zhang Liang1ORCID,Li Ting23,Yuan Jiawei45,Shi Guoliang45,Wang Xinyu1,Zhang Kui45,Li Yongjun45

Affiliation:

1. School of Architecture and Civil Engineering, Huanghuai University, Zhumadian 463000, China

2. Guobiao (Beijing) Testing & Certification Co., Ltd., Beijing 100088, China

3. China United Test & Certification Co., Ltd., Beijing 100088, China

4. State Key Laboratory of Nonferrous Metals and Process, GRINM Group Co., Ltd., Beijing 100088, China

5. GRIMAT Engineering Institute Co., Ltd., Beijing 101407, China

Abstract

Alloys Mg-8Gd-4Y-0.6Zn-0.5Zr (referred to as 0.6Zn) without the bulk long-period stacking ordered (LPSO) phase and Mg-8Gd-4Y-1.1Zn-0.5Zr (referred to as 1.1Zn) containing the bulk LPSO phase were prepared and a series of hot compression tests were conducted to examine and evaluate the influence of the bulk LPSO phase on the thermal deformation behavior and characteristics of the Mg-Gd-Y-Zn-Zr alloy. The bulk LPSO phase affects the dynamic recrystallization behavior, resulting in differences in flow stress between two alloys under different conditions. Specifically, in the temperature range of 380~460 °C, compression at lower strain rates is beneficial for the LPSO phase to promote dynamic recrystallization, while compression at a high strain rate inhibits the dynamic recrystallization due to the severe deformation of the bulk LPSO phase to release the stress concentration instead. The increase in temperature helps the LPSO promote dynamic recrystallization. As a result, the LPSO phase promotes dynamic recrystallization at all experimental strain rates at 500 °C. Furthermore, the thermal processing maps of the 0.6Zn and 1.1Zn alloys are established, and their optimal processing windows are located at 500 °C/0.001~0.01 s−1 and 500 °C/0.01 s−1, respectively. In addition, the instability zones for the 1.1Zn alloy are much larger than that for the 0.6Zn alloy, which corresponds to the microcracks generated at the interfaces between α-Mg and bulk LPSO phases.

Funder

Henan Provincial Department of Science and Technology Research Project

the Cultivation Fund of Huanghuai University for National Projects

the Youth Fund Project of GRINM

Henan Province Graduate Education Reform and Quality Improvement Project

Publisher

MDPI AG

Subject

General Materials Science

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