Hot deformation and dynamic recrystallization behaviors of Mg-Gd-Zn alloy with LPSO phases

Release time:2021-10-21

DOI number:10.1016/j.jallcom.2019.04.036

Journal:Journal of Alloys and Compounds

Key Words:Magnesium alloys; Hot deformation; Dynamic recrystallization; LPSO phase

Abstract:The hot deformation and dynamic recrystallization (DRX) behaviors of the homogenized Mg-5.6Gd-0.8Zn (wt.%) alloy with high density lamellar long period stacking ordered (LPSO) phases were investigated. The hot compression tests were conducted at temperatures (T) ranging from 350 °C to 500 °C and strain rates (ε˙) ranging from 0.001 s to 1 to 1 s-1, by which the hot deformation behavior was characterized by true stress-strain curve and the constitutive equation was calculated. Except for the deformation conditions of T = 350 °C and ε˙ = 0.1–1 s-1, the true stress-strain curves show DRX characteristics. The LPSO phases had inserted great influences on the deformation and DRX mechanisms of the alloy: (i) when deformed at T = 350–450 °C, the LPSO phases had good thermal stability while both twinning and kinking played an important role under various strain rates. The degree of DRX was low and DRXed grains were small. (ii) When deformed at T = 500 °C, the LPSO phases were almost melted into the matrix and slip played a dominant role while the degree of DRX was high and its grains were significantly grown.

Co-author:Z.Y. Chen*, T. Chen, J.B. Shao, R.K. Wang, C.M. Liu

First Author:K. Li

Discipline:Engineering

First-Level Discipline:Materials Science and Engineering

Document Type:J

Volume:792

Page Number:894-906

ISSN No.:0925-8388

Translation or Not:no

Date of Publication:2019-04-14

Included Journals:SCI