Open AccessEffect of pre-extrusion on microstructure and mechanical properties of caliber-rolled AZ80 alloy
Author(s) -
Jirong Qin,
Hui Yu,
Huang Yan,
Q.Z. Li,
Wei Yu,
H. Liu,
Xiwang Dong,
Mingxu Yang
Publication year - 2021
Publication title -
materials research express
Language(s) - English
Resource type - Journals
ISSN - 2053-1591
DOI - 10.1088/2053-1591/abd89e
Subject(s) - caliber , extrusion , materials science , ultimate tensile strength , formability , alloy , microstructure , metallurgy , grain size , deformation (meteorology) , elongation , magnesium alloy , composite material
In this paper, pre-extrusion treatment was applied to AZ80 alloy prior to caliber rolling, and microstructural evolution as well as mechanical properties of groove-rolled AZ80 alloy were studied. The results shown that the pre-deformation treatment can enhance the formability of AZ80 alloy and the cracking can be avoided. In addition, the pre-extrusion also resulted in fine grain structure after rolling process. Especially, 8-pass caliber rolling following by pre-extrusion of AZ80 alloy shown uniform and fine dynamic recrystallized (DRX) structure. Besides, the introduction of pre-deformation also promotes more second phases during caliber rolling. Therefore, the mechanical properties shown that the yield strength (TYS), tensile strength (UTS) and elongation after fracture (El.) of pre-extruded AZ80 caliber-rolled bars are 250 MPa, 440 MPa and 15%, respectively, which increased by 72%, 37%, and 88% compared with their as-cast counterparts. The improvement of mechanical properties is attributed to synergy effects of grain refinement, second precipitates strengthening and texture optimization.