Solid state recycling of Mg-7Gd-4Y-2Zn-0.4Zr alloy chips was carried out with composite forming process of hot pressing sinte-ring and extrusion-shear forming.SiC particles with volume fraction of 5％,7％and 9％were added in the chips,and the effects of SiC particles content on microstructure and mechanical properties of the solid state recycled billets were studied.The results show that after hot pressing sintering,the interface of billet is obvious and O element is enriched at the sintered interface.In addition,large SiC particles ex-ist in the microstructure,and the plasticity of different samples is poor.Compared with other samples,the hot sintered sample with SiC volume fraction of 7％has the best comprehensive properties with tensile strength of 232 MPa and elongation of 1.76％.After extrusion-shear composite forming,the sintered interfaces in the microstructure disappear and the average grain size is refined to 10 μm.In addi-tion,the originally agglomerated SiC particles are distributed uniformly and diffusely in the alloy.The solid state recycled billet with SiC volume fraction of 5％has better comprehensive mechanical properties with the tensile strength of 269 MPa and elongation of 12.2％,which is 24.5％and 62.7％higher than that of the alloy after solution treatment,respectively.
关键词
Mg-Gd-Y-Zn-Zr合金/固相再生/挤剪复合成形/SiC颗粒
Key words
Mg-Gd-Y-Zn-Zr alloy/solid state recycling/extrusion-shear composite forming/SiC particle
维普
万方数据