论文部分内容阅读
利用微量元素Sr对A380铝合金进行变质处理,并对变质后的合金进行热处理,研究Sr变质和热处理对铝合金组织性能的影响。结果表明:Sr元素能改善A380铝合金的延展性能,0.04%Sr变质可将粗大的片状共晶硅转变为细小纤维化状态。对变质后的铝合金进行490℃/15 min固溶处理、水淬+175℃/8 h的热处理后,纤维状共晶硅发生球化现象,组织结构致密化,力学性能提高,抗拉强度由铸造状态的179 MPa提升至258 MPa,伸长率由原来的3.3%提升至4.2%。断裂面为韧脆混合断裂机制,且变质热处理后,合金的摩擦系数减小。
The modification of A380 aluminum alloy with trace element Sr and the heat treatment of the deteriorated alloy were carried out to study the effect of Sr modification and heat treatment on the microstructure and properties of aluminum alloy. The results show that Sr can improve the ductility of A380 aluminum alloy, and 0.04% Sr can change coarse flaky eutectic silicon to fine fibrosis. After 490 ℃ / 15 min solution heat treatment and water quenching + 175 ℃ / 8 h heat treatment, the eutectic microstructure of the deteriorated aluminum alloy was spheroidized, the microstructure was densified, the mechanical properties were improved, the tensile strength From 179 MPa casting state to 258 MPa, the elongation increased from 3.3% to 4.2%. The fracture surface is a ductile-brittle mixed fracture mechanism, and the friction coefficient of the alloy decreases after the metamorphic heat treatment.