【摘要】 研究了Sb变质Mg-6Al-1Zn-0.7Si镁合金的凝固行为、铸态组织及力学性能。研究结果表明:Mg-6Al-1Zn-0.7Si合金的铸态组织主要由初生!-Mg、M17Al12和Mg2Si相组成,其中Mg2Si相的汉字状形态非常明显,且比较粗大。而添加0.4%Sb变质后,合金组织中的Mg2Si相变得相对细小,从而使合金的拉伸性能以及抗蠕变性能得到提高。此外,添加0.4%Sb对Mg-6Al-1Zn-0.7Si合金凝固过程中的相变类型没有影响,并且对合金的相变峰值温度、开始转变温度和凝固温度范围的影响也不大。更多还原

【Abstract】 The solidification behavior,as-cast microstructure and mechanical properties of Mg-6Al-1Zn-0.7Si magnesium alloy modified by antimony,were investigated. The results indicated that the as-cast microstructure of Mg-6Al-1Zn-0.7Si alloy is composed ofα-Mg,M17Al12 and Mg2Si phases,and the Mg2Si phases appear obvious Chinese script morphology and very coarse. However,after adding 0.4%Sb,the Chinese script shaped Mg2Si phases change to be relatively fine,which result in the improvement of the tensile and creep properties. In addition,according to the DSC results obtained,adding 0.4%Sb does not affect the phase transformation type of Mg-6Al-1Zn-0.7Si alloy,and has no obvious effect on the phase transformation peak temperature,onset temperature and solidification temperature range.更多还原