中文摘要：

AZ31B 镁合金芯片被包括的三固态的再循环进程再循环冷压， hot-pressing 由热挤出和两倍挤出列在后面。微观结构和再循环的标本和参考标本的机械性质被比较。为再循环的标本由冷压，谷物由于双胞胎和高密度脱臼的存在在热挤出期间被精制到大程度。由 hot-pressing 和两倍挤出的再循环的标本不比的展出更好的谷物再循环的标本由冷压。因而，由 hot-pressing 和两倍挤出的再循环的标本的更高最终的张力的力量没被完成。为热紧迫的过程，更多的紧缩的营舍在再循环的材料降低孔，因此到再循环的标本的失败的延伸增加。两倍挤出过程制作的再循环的标本比参考标本显示出稍微更高的延伸。第二挤出让氧化物推进压碎并且分散地散布更多，并且最小化孔，它为改进韧性负责。

英文摘要：

AZ31B magnesium alloy chips were recycled by three solid-state recycling processes including cold-pressing,hot-pressing followed by hot extrusion and double extrusion.Microstructure and mechanical properties of the recycled specimens and reference specimens were compared.For the recycled specimen by cold-pressing,the grains are refined to a large extent during hot extrusion due to the presence of twins and high density dislocation.The recycled specimens by hot-pressing and double extrusion do not exhibit finer grain than that the recycled specimen by cold-pressing.Consequently,higher ultimate tensile strength of the recycled specimen by hot-pressing and double extrusion is not achieved.For hot pressing process,more compact billet lowers the porosity in recycled material,so elongation to failure of the recycled specimen increases.The recycled specimen fabricated by double extrusion process shows slightly higher elongation than the reference specimen.The second extrusion makes the oxides further crush and distribute more dispersedly,and minimizes porosity,which is responsible for the improved ductility.