Ma Lehang, Tang Jianguo, Tu Wenbin, Ye Lingying, Jiang Haichun, Zhan Xin, Zhao Jiuhui
Light Alloy Research Institute, Central South University, Changsha 410083, China.
School of Materials Science and Engineering, Central South University, Changsha 410083, China.
Materials (Basel). 2020 Feb 19;13(4):913. doi: 10.3390/ma13040913.
In this paper, the effect of trace Sn on the precipitation behavior and mechanical properties of Al-Mg-Si alloys with different Mg/Si ratios aged at 180 °C was investigated using hardness measurements, a room-temperature tensile test, transmission electron microscopy and differential scanning calorimetry. The results shown that Sn reduces the precipitation activation energy, increases the number density of β″ precipitates, and then increased the aging hardenability and mechanical properties of the Al-Mg-Si alloy. However, the positive effect of Sn on the mechanical properties of the Al-Mg-Si alloy drops with the decrease of the Mg/Si ratio of the alloy.
本文采用硬度测量、室温拉伸试验、透射电子显微镜和差示扫描量热法，研究了微量Sn对不同Mg/Si比的Al-Mg-Si合金在180℃时效时析出行为和力学性能的影响。结果表明，Sn降低了析出激活能，增加了β″相析出物的数量密度，进而提高了Al-Mg-Si合金的时效硬化能力和力学性能。然而，随着合金Mg/Si比的降低，Sn对Al-Mg-Si合金力学性能的积极影响减弱。
