Microstructure evolution of Mg-9Gd-4Y-2Zn-0.5Zr alloy under compression-torsion with continuous decreasing temperature
The hot compression-torsion experiments of Mg-9Gd-4Y-2Zn-0.5Zr alloy rods were conducted using Gleeble-3500 thermal-me-chanical simulator,the continuous decreasing temperatures was adopted during deformation,the temperature range was 420-480℃and the decreasing temperature rate was 10℃·s-1.The microstructure evolution laws of deformed specimen were analyzed.The results show that microstructures are gradient;the grain size,LPSO phase size and the ED//<0001>texture intensity decrease with the increase of the rod specimen radius.Intragranular LPSO phases are kinked mechanically and fragmented,and the block-shaped LPSO phase is dis-solved,stripe-shaped structure is formed,and a portion of stripe-shaped structure is kinked under external force conditions.Continuous dynamic recrystallisation and LPSO phase-stimulated recrystallisation mainly occur during deformation.Continuous decreasing tempera-tures is beneficial for the nucleation of recrystallization,leading to a large number of fine recrystallization grains,which inhibits the growth of recrystallization grains and the increase of ED//<0001>texture strength.
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