中國有色金屬學報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 35 No. 10 October 2025 |
（1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China;
3. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China）
Abstract:The effect of extrusion temperature on the dynamic recrystallization behavior and mechanical properties of the flame-retardant Mg-6Al-3Ca-1Zn-1Sn-Mn (wt.%) alloy was investigated. The observed dynamic recrystallization mechanisms in the alloy include continuous dynamic recrystallization (CDRX) and particle simulated nucleation (PSN) during hot extrusion. A significant increase in yield strength, from 218 to 358 MPa, representing a 140 MPa increase, is achieved by decreasing the extrusion temperature. The strengthening mechanisms were analyzed quantitatively, with the enhanced strength primarily attributed to grain boundary and dislocation strengthening. The plasticity mechanism was analyzed qualitatively, and the increase in the volume fraction of unDRXed grains caused by the decrease in extrusion temperature leads to an increase in the number of {10 2} tensile twins during the tensile deformation, resulting in a reduction in plasticity.
Key words: flame-retardant magnesium alloys; PSN mechanism; high strength; hot extrusion
