【摘 要】
：
The homogenized Mg-8.2Gd-3.8Y-1.0Zn-0.4 Zr (wt.％) alloy full of plate-shaped long period stacking ordered (LPSO) phases was hot extruded in the atmosphere and co
【机 构】
：
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;Re
论文部分内容阅读
The homogenized Mg-8.2Gd-3.8Y-1.0Zn-0.4 Zr (wt.％) alloy full of plate-shaped long period stacking ordered (LPSO) phases was hot extruded in the atmosphere and cooled by the forced-air,then the effect of forced-air cooling on the microstructure and age-hardening response of the alloy was investigated in this work.The results show that in comparison with the extruded sample cooling in the atmosphere,the forced-air cooling restricts dynamic recrystallization (DRX) and brings about finer dynamic recrystallized (DRXed) grain size,stronger basal texture and higher dislocation density.Furthermore,the forced-air cooling promotes the dynamic precipitation in the DRXed regions and facilitates formation of plate-shaped LPSO phases and γ'phases with smaller interspacing in the unrecrystallized (unDRXed) regions,then slightly restricts the precipitation of β'phases during aging.After peak-ageing treatment,the extruded sample with forced-air cooling shows superior tensile properties with a tensile yield strength of 439 MPa,an ultimate tensile strength of 493 MPa,and elongation to failure of 18.6 ％.
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