(1. 重慶工學院 材料科學與工程學院，重慶400050；2. 重慶大學 材料科學與工程學院，重慶400030)
摘 要: 通過金相、掃描電鏡(SEM)、X射線衍射分析(XRD)和差熱分析(DSC)等手段，研究Sb變質對Mg-6Al-1Zn-0.7Si鎂合金熱處理組織和力學性能的影響，尤其是對合金固溶處理組織的影響。結果表明：固溶處理可以變質Mg-6Al-1Zn-0.7Si鎂合金鑄態(tài)組織中的漢字狀Mg2Si相，使Mg2Si相從漢字狀變?yōu)?SPAN style="mso-font-kerning: 1.0pt">短桿狀和條塊狀，并且添加0.4%Sb到實驗合金中可使固溶處理變質漢字狀Mg2Si相的效果提高。也正是由于固溶處理可以使實驗合金組織中的漢字狀Mg2Si相變質，使得Mg-6A1-1Zn-0.7Si合金時效處理后獲得了較鑄態(tài)更高的的抗拉性能和抗蠕變性能，并且添加0.4%Sb可以進一步增強熱處理對性能的改善作用。
關鍵字: Mg-A1-Si系合金；Mg-6A1-1Zn-0.7Si合金；Sb；固溶處理；Mg2Si相
（1. Materials Science and Engineering College, Chongqing Institute of Technology,Chongqing 400050, China;2. Materials Science and Engineering College, Chongqing University,Chongqing 400030, China）
Abstract:The effects of Sb modification on the heat-treated microstructure and mechanical properties of Mg-6A1-1Zn-0.7Si alloy, especially on the solutionized microstructure, were investigated by means of metallurgical phase analysis, scanning electron microscopy (SEM) analysis, X-ray diffraction (XRD) analysis, and differential scanning calorimetry (DSC) analysis. The research results indicate that after being solutionized, the Chinese script shaped Mg2Si phases in the microstructure of the alloy are modified, namely, their morphologies change from Chinese script shape to short pole and block shapes, and the higher modification efficiency could be obtained for the alloy added 0.4%Sb. The effect of solid solution treatment on the morphology of Chinese script shaped Mg2Si phases, results in higher tensile and creep properties for the experimental alloy followed by aging treatment, and the properties improvement resulted from heat treatment, is more obvious for the alloy added 0.4%Sb.
Key words: Mg-A1-Si based alloy; Mg-6A1-1Zn-0.7Si alloy; Sb; solid solution-treatment; Mg2Si phase
