Deformation behaviors of Mg-Gd-Zn based high rare-earth magnesium matrix composites
TC4(Ti-6Al-4V)particle reinforced Mg-13Gd-5Y-2Zn-1 Mn magnesium matrix composites were prepared by semi-solid stirring casting and hot extrusion processes,and their microstructure and deformation behavior were analyzed using optical microscope,scanning electron microscopy,uniaxial compression testing and three-point bending testing.The results show that during the extrusion,the TC4 particles hinder the dynamic recrystallization process of its surrounding grains and the deformation of long-period stacking ordered(LPSO)phases,the texture direction of the grains is changed,and different regions composed of LPSO phase,TC4 particles,recrystallized grains and deformed grains are formed in the matrix.The compressive performance of the composites has been significantly improved compared to the matrix,with compressive yield strength and ultimate compressive strength reaching 450 and 637 MPa,and compressive strain of 10.1％.Under compressive stress,a large number of deformation twins,mainly<11(2)0>86° twins,appear in the composites,resulting in strong twinning strengthening.
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