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采用力学性能测试、X射线衍射物相分析、SEM背散射扫描和能谱分析、金相试验技术,研究了时效工艺对固溶-冷拉处理过程中,用Sn和Bi微合金化对无Pb易切削Al-Mg-Si合金棒材显微组织结构特征和力学性能的影响。结果表明,其最佳的时效热处理工艺为170℃×8h。单独添加Sn的合金的物相组成除了Al基体,还有低熔点Mg2Sn和AlMnSi相,而联合添加Sn,Bi的合金组织由Al基体,低熔点Mg3Bi2与少量Sn和Bi单质以及AlMnSi相组成。
The effect of aging process on the solution-cold-drawing process was studied by means of mechanical property test, X-ray diffraction phase analysis, SEM backscatter scanning and energy spectrum analysis and metallographic test. Effect of Microstructure and Mechanical Properties of Free-cutting Al-Mg-Si Alloy Bar. The results show that the best aging heat treatment process is 170 ℃ × 8h. In addition to the Al matrix, the phase composition of the Sn-added alloy alone has the low melting point Mg2Sn and AlMnSi phases, and the alloy structure of the Sn and the Bi added together consists of the Al matrix, the low melting point Mg3Bi2, the small amount of Sn and Bi elements, and the AlMnSi phase.