Effects of Initial Microstructure Characteristics on Hot Deformation Behaviors of 2E12 Aluminum Alloy

Abstract

Three alloys with different microstructure characteristics were prepared, which microstructures were characterized as enriched with eutectics, supersaturated solid solution and coarse precipitates. Combined isothermal hot compression test and microstructure observation, the hot deformation behaviors of three alloys were studied in the temperature range of 340-490℃ and strain rate range of 0.001-10s-1. The results show initial microstructure characteristics have significant influences on the hot deformation of alloys. Among three alloys, the alloy enriched with coarse precipitates has the largest peak stress value while the alloy enriched with eutectics has the smallest one. The flow behaviors of three alloys were described by the hyperbolic sine constitutive equations. The deformation activation energy for three alloys calculated to be 178.6, 222.1, 154.9kJ/mol, respectively. The processing maps were calculated and analyzed according to the dynamic materials model. Among three alloys, the alloy enriched with coarse precipitates has the widest processing range while the alloy enriched with eutectics has the narrowest one.

Keywords

• 2E12 aluminum alloy
• hot deformation
• microstructure
• processing map