Study Of Medium Intensity And High Conductivity Of Al-Mg-Si Alloy Wire

The conductivity and tensile strength of medium intensity and high conductivity ofAl-Mg-Si alloy wire is affected by alloying and aging process factors. According to study themicro state in conditions of different Mg and Si content and different aging, it can be foundthat the sample resistivity is increased atlong times aging、high aging temperature or highMg and Si content. The tensile strength of sample is increased with increasing alloyingelements. By aging treatment, the tensile strength is firstly increased with increasing agingtime, and then decreased.After artificial aging, Mg2Si phase precipitated with independent lattice structure. Partof the Si and a small amount of Fe in Al can form AlFeSi phase which attach with Mg2Siprecipitation. The AlFeSi phase can passivate Mg2Si angle and reduce the intergranularcorrosion causing stress concentration, then improve the mechanical properties and electricalproperties. The density of Mg2Si strengthening phase is large with increasing Mg and Sicontent. The Mg2Si is easy to form a center crack in alloy conductor during forming process,reduce its tensile strength, but no influence on its conductivity.The Al-Mg-Si alloy conductor samples in theoretical analysis find that the resistivityof Al-Mg-Si alloy wire can reduce theoretical the calculation error rate from13.3%to3.6%with introducing vacancy based on MTИMИCCEH-ΦИЛEMHГ rules. It can improved theperformance of the alloy wire electrical calculation ability. After high temperature extrusionforming, a lot of empty seats disappeared in the matrix, the resistivity values is lowe, whilethe intensity is improved; After artificial aging, a large number of Mg2Si precipitate andsamples intensity is increases. The theoretical calculation found that these two methods ofreinforcement is the most effective reinforcement method. By optimizing the alloycomposition and aging process, The tensile strength and high conductivity of Al-Mg-Si alloywires were prepared which the electrical conductivity is60.6%IACS and the tensile strengthis230MPa. Its comprehensive performance is higher than the currently widely used Al alloywires.