中國有色金屬學報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 28 No. 11 November 2018 |
（1. School of Materials Engineering, Jiangsu University of Technology, Changzhou 213001, China;
2. School of Mechanical Engineering, Jiangsu University of Technology, Changzhou 213001, China）
Abstract:The effect of extrusion ratio on microstructure and mechanical properties of as-extruded Mg-6Sn-2Zn-1Ca (TZX621) (mass fraction, %) alloy was investigated. It is found that incomplete dynamic recrystallization (DRX) took place in as-extruded TZX621 alloy. As the extrusion ratio was increased from 6 to 16, both fraction of un-DRXed grains and average size of DRXed grains in as-extruded TZX621 alloy decreased and the basal texture was weakened. Coarse CaMgSn phase was broken into particles and fine Mg2Sn phase precipitated from α-Mg matrix during hot extrusion. Yield strength, ultimate tensile strength and elongation of as-extruded TZX621 alloy with extrusion ratio of 16 reached 226.9 MPa, 295.6 MPa and 18.1%, which were improved by 36.0%, 17.7% and 13.5%, respectively, compared to those of as-extruded TZX621 alloy with extrusion ratio of 6.
Key words: Mg-Sn alloy; extrusion ratio; microstructure; texture; mechanical properties
