【摘要】 采用自行研制的镁合金半固态流变压铸成形机组 ,研究了半固态制浆工艺与组织及性能之间的关系。结果表明 ,镁液浇注温度越高 ,制浆搅拌的剪切速率越高 ,或搅拌机的筒体温度越高 ,半固态非枝晶组织的固相率越低。所制备的AZ91D镁合金半固态组织细小、圆整 ,晶粒度为 3 0～ 5 0 μm ,半固态流变压铸试样的抗拉强度和伸长率比液态压铸试样有显著提高。更多还原

【Abstract】 The processes of fabrication of semi solid slurry and microstructure and properties of semi solid magnesium alloys have been studied with a semi solid rheo die casting machine made by the authors. Results show that the higher the pouring temperature of the melt, or the higher the shear rate, or the higher the barrel temperature of the machine, the lower the solid phase fraction in the semi solid microstructure. The semi solid structure of AZ91D alloy is small and round, and the cell size is from 30μm to 50μm. The tensile strength and elongation of the samples made by semi solid rheo die casting process are much higher than those of the samples made by melt die casting.更多还原