热处理型中强度铝合金导体材料的组织与性能

Microstructure and properties of heat treatable medium strength aluminium alloy conductor material

采用扫描电镜和能谱仪观察Al-Mg-Si合金铸态样和拉拔变形样中富铁相AlFeSi的微观形貌和微区成分,并利用万能材料试验机和电阻测试仪测定Al-Mg-Si合金单丝的抗拉强度和电导率。结果表明,在强度相同的条件下,Mg2Si含量≤0.6%(质量分数)的Mg过剩型Al-Mg-Si合金具有较高的电导率,且Mg过剩型合金的富铁相为α(AlFeSi)相;Mg2Si含量为0.6%的Mg过剩型Al-Mg-Si合金在抗拉强度为230 MPa时,其电导率为59.0%(IACS);开发强度为230~250 MPa的高电导率、中强度铝合金导体材料时应在Mg2Si含量≤0.6%的Mg过剩型Al-Mg-Si合金的基础上进行。

The microstructure and composition of Fe-rich AlFeSi phase in the cast and drawn Al-Mg-Si alloy specimens were studied by scanning electron microscopy assisted with energy dispersive spectroscopy of X-ray. The tensile strength and electrical conductivity of the experimental alloy wire were tested by material testing machine and electrical resistance testing instrument. The results show that the Al-Mg-Si alloy with excess Mg has a higher electrical conductivity than the balanced and with excess Si alloy in the same tensile strength as the amount of Mg2Si≤0.6% (mass fraction). The Al-Mg-Si alloy with excess Mg possesses α(AlFeSi) phase. The Al-Mg-Si alloy with excess Mg and 0.6% Mg2Si has 59.0%(IACS) in electrical conductivity and 230 MPa in tensile strength. The development of medium strength conductor material with 230-250 MPa tensile strength and higher conductivity should be based on Al-Mg-Si alloy with excess Mg and content Mg2Si≤0.6%.