论文部分内容阅读
采用显微组织分析、硬度测试、拉伸测试、SEM断口分析等手段,系统研究了均匀化处理工艺对Al-Mg-Si-Cu合金铸态显微组织及力学性能的影响。结果表明:Al-Mg-Si-Cu合金铸态组织中存在大量粗大枝晶。合金经560℃×24 h均匀化处理,组织中非平衡相基本溶解,晶粒得到明显细化,硬度值达到最高,抗拉强度为204 MPa,屈服强度为187 MPa,伸长率达8.5%,断口试样显示为韧窝和准解理型的混合型断裂特征,合金表现出较好的力学性能。与保温时间相比,均匀化处理温度对硬度的影响更加关键。
The effects of homogenization treatment on the microstructure and mechanical properties of Al-Mg-Si-Cu alloy were systematically investigated by means of microstructure analysis, hardness test, tensile test and SEM fracture analysis. The results show that there are a lot of coarse dendrites in the as-cast Al-Mg-Si-Cu alloy. The alloy was homogenized at 560 ℃ for 24 h, and the unbalanced phase in the microstructure was basically dissolved. The crystal grains were obviously refined and the hardness reached the highest value. The tensile strength was 204 MPa, the yield strength was 187 MPa and the elongation was 8.5% , The fractured specimens show mixed fracture characteristics of dimples and quasi-cleavage, and the alloys show better mechanical properties. Compared with the holding time, the homogenization temperature on the hardness of the more critical.