(1. 常州大学 材料科学与工程学院，江苏省表面科学与技术重点实验室，常州 213164；
2. 常州大学 江苏省光伏科学与工程协同创新中心，常州 213164)
摘 要: 采用Al-3B中间合金对不同温度Al-12.6Si合金熔体进行变质处理。结果表明：当变质温度相同时，随着Al-3B加入量的增加，Al-12.6Si合金中α(Al)相的面积分数呈现先增大后减小的变化趋势，当Al-3B加入量为0.4%(质量分数)时，α(Al)相面积分数达到最大值35.6%。当Al-3B加入量为0.4%时，随着变质温度的升高，Al-12.6Si合金中α(Al)相的面积分数也呈现先增大后减小的变化趋势，当变质温度为700 ℃时，合金组织中α(Al)相的面积分数最大。与未变质Al-12.6Si合金相比，在700 ℃时经0.4%Al-3B变质处理后，Al-12.6Si合金的抗拉伸强度和伸长率分别提高12%和64%，变质处理后合金的综合力学性能得到明显提高。
关键字: Al-12.6Si合金；变质处理；显微组织；力学性能
（1. Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou 213164 , China;
2. Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou 213164, China）
Abstract:The Al-3B master alloy was used to modify the melt of Al-12.6Si alloy at different temperatures. The results show that when the modification temperature is the same, the area fraction of α(Al) phase in Al-12.6Si alloy increases first and then decreases with the increase of the addition amount of Al-3B, and it reaches the maximum value of 35.6% when the added amount of Al-3B is 0.4% (mass fraction). When the addition amount of Al-3B is 0.4%, the area fraction of α(Al) phase in Al-12.6Si alloy increases first and then decreases with the increase of modification temperature. When the modification temperature is 700 ℃, the area fraction of the α(Al) phase in the alloy reaches the maximum. Compared with the unmodified Al-12.6Si alloy, the tensile strength and elongation of the Al-12.6Si alloy modified by 0.4% Al-3B at 700 ℃ increases by 12% and 64%, respectively. The comprehensive mechanical properties of alloy are obviously improved after modification.
Key words: Al-12.6Si alloy; modification; microstructure; mechanical property
