【摘要】 试验研究了经过变质处理的AZ91D镁合金利用SIMA法制备半固态浆料,在等温热处理过程中的组织演变。结果表明:在AZ91D镁合金中加入Ce、Sb和两者的混合物后,合金铸态组织明显细化,添加0.6%(Ce+Sb)的混合物,能得到较好的细化效果,晶粒尺寸为60～70μm。变质处理可促进形变合金组织中的初生相在半固态等温热处理过程中由枝晶向粒状晶的转变,获得更加细小并且均匀的球状组织(50～55μm),可以满足后续的半固态成形的基本要求。更多还原

【Abstract】 The microstructure evolution of the processed AZ91D Mg alloy during semi-solid isothemal treatment has been studied with SIMA producing semi-solid slurry, resulting in that: after adding Ce, Sb and the mixture in the AZ91D Mg alloy,the as_cast alloy organization has been obviously fined and better refinement with grain size 60～70 μm by adding the mixture of 0.6%(Ce+Sb). The processing may promote the change of the original microstructure from dendrites to grain in the semi-solid isothemal treatment, acquire more small and globular organization(50-55μm),satisfy the basic request of the successive semi-solid forming.更多还原