【摘要】 阐述了对Al-Si-Cu-Mg合金的热挤压进行的研究,发现热挤压后合金常温抗拉强度最高可以达到296.9MPa,伸长率可以达到18%以上,力学性能显著提高。Al-Si-Cu-Mg合金经热挤压,共晶硅相和Al2Cu、Mg2Si等第二相由大颗粒状或短棒状被破碎成细小颗粒状,且分布均匀。T6热处理后这些颗粒状硅相棱角消失,表面圆整化,拉伸过程中避免了应力集中的产生,合金的抗拉强度达到了408.0MPa,伸长率也达到了11.39%。更多还原

【Abstract】 The tensile strength and elongation of hot extruded Al-Si-Cu-Mg alloy at room temperature can reach 296.6 MPa and 18%,respectively,showing significant improvement of mechanical properties of the alloy.Eutectic phase and secondary phase,including Al2Cu phase and Mg2Si phase,in the hot extruded Al-Si-Cu-Mg alloy can be converted from bulk particle or short rod into fine particles with more uniform distribution.After T6 treatment,the tensile strength of the alloy can reach 408 MPa with elongation more than 10%,which is attributed to the spheriodization of Si particle eliminating the stress concentration during tensile testing.更多还原