Si含量对6060铝挤压型材组织与力学性能的影响

Effect of Si Content on Microstructure and Mechanical Properties of Aluminum Extrusion Profiles

通过对不同Si含量的6060铝合金T6态挤压型材进行力学性能测试,结合组织形貌观察及金相显微组织分析,研究了Si含量对6060铝合金挤压型材组织和力学性能的影响。研究结果表明,Mg/Si<1.73时,室温拉伸期间,合金拉伸断裂后无明显颈缩现象;随Si含量的增加,晶粒尺寸变化不明显,析出的第二相密度增大;尺寸减小且分布均匀,有助于改善合金的抗拉强度及屈服强度,断裂机制由沿晶断裂变为沿晶加穿晶的混合断裂。

In this paper, the effect of Si content on the microstructure and mechanical properties of 6060 aluminum alloy extruded by T6 state extruded profiles with different Si content is studied by means of mechanical properties test and microstructure observation and metallographic microstructure analysis. The results showed that when Mg/Si <1.73, there is no obvious necking during tensile fracture at room temperature. With the increase of Si content, the grain size did not change obviously, and the density of the second phase increased. The size decreases and the distribution is uniform, which is helpful to improve the tensile strength and yield strength of the alloy, and the fracture mechanism changes from inter-granular fracture to inter-granular and trans-granular mixed fracture.