TITLE:
Thermo-Mechanical Treatment on Microstructure and Mechanical Properties of Mg-5.0Sn-1.0Mn-0.4Zr Alloy
AUTHORS:
Xiaoping Luo, Daqing Fang, Baosheng Liu
KEYWORDS:
Mg-Sn-Mn-Zr Alloy, Thermomechanical Treatment, Microstructure, Mechanical Properties
JOURNAL NAME:
Advances in Materials Physics and Chemistry,
Vol.8 No.1,
January
24,
2018
ABSTRACT: The mechanical properties and microstructure of an as-cast Mg-5.0Sn-1.0Mn-0.4Zr alloy were investigated during thermo mechanical treatments consisting of hot extrusion, rolling, and ageing at 200°C. The results indicate that only Mg2Sn phases formed in the Mg matrix, Mn and Zr do not cause the formation of any new phases. The average grain size, tensile strength and elongation were 22 μm, 285 MPa, and 14.5%, respectively, after extrusion + rolling + ageing treatment (ERA). The mechanical properties of ERA alloys with a peak hardness of 81 HV and 6.7% are improved compared with those of EA (extrusion + ageing treatment) samples; these changes are attributed to grain refinement and solid solution strengthening, age hardening, and precipitation strengthening.