人工时效对Al-Mg-Si铝合金导线导电性能和力学性能的影响

Effects of Artificial Aging on Conductivity and Mechanical Properties of Aluminum Alloy Wire

设计了不同Si、Mg含量的中强度Al-Mg-Si合金导线,研究了人工时效对中强度铝合金导线导电性能、力学性能和显微组织的影响。研究表明：人工时效后,Al-Mg-Si合金中析出Mg2Si强化相和β-Al_9Fe_2Si_2相,β-Al_9Fe_2Si_2相使Mg2Si形状得到钝化,降低了因应力集中导致的晶间腐蚀,从而降低电阻率,提高了抗拉强度。含Mg0.6%,Si0.4%,Cu0.6%,Fe0.13%的ф4 mm铝合金导线,经过200℃×6 h时效处理后,导电率达到60.1%IACS,抗拉强度达到230MPa,均优于当前应用的ф4 mm的中强度铝合金导线。

The medium strength A1-Mg-Si alloy wire with different Si and Mg contents was designed, the effects ofartificial aging on conductivity and mechanical properties of aluminum alloy wire were studied. Research shows that, theenhanced phase of Mg2Si and 13-AIgFe2Si2 are precipitated in A1-Mg-Si alloy samples after artificial aging. 13-A19Fe2Si2 phasemakes the Mg2Si shape passivated, and it reduces the intergranular corrosion caused by stress concentration, thus reducing theresistivity and improving the tensile strength. The composition is 0.6Mg, 0.4Si, 0.6Cu, 0.13Fe of q54 mm alloy wire, after 200℃ x6 h aging treatment, conductivity reaches 60.1%IACS, the strength reaches 230 MPa, the performance is better than thecurrent applied 44 mm aluminum alloy wire.