(1. 華北電力大學 能源動力與機械工程學院，北京 102206；
2. 國家火力發(fā)電工程技術研究中心，北京 102206；
3. 國網(wǎng)智能電網(wǎng)研究院 電工新材料及微電子研究所，北京 102211)
摘 要: 采用掃描電鏡和能譜儀觀察Al-Mg-Si合金鑄態(tài)樣和拉拔變形樣中富鐵相AlFeSi的微觀形貌和微區(qū)成分，并利用萬能材料試驗機和電阻測試儀測定Al-Mg-Si合金單絲的抗拉強度和電導率。結(jié)果表明，在強度相同的條件下，Mg2Si含量≤0.6%(質(zhì)量分數(shù))的Mg過剩型Al-Mg-Si合金具有較高的電導率，且Mg過剩型合金的富鐵相為α(AlFeSi)相；Mg2Si含量為0.6%的Mg過剩型Al-Mg-Si合金在抗拉強度為230 MPa時，其電導率為59.0% (IACS)；開發(fā)強度為230~250 MPa的高電導率、中強度鋁合金導體材料時應在Mg2Si含量≤0.6%的Mg過剩型Al-Mg-Si合金的基礎上進行。
關鍵字: 導體材料；鋁合金；AlFeSi相；電導率；時效處理
（1. School of Energy, Power and Mechanical Engineering, North China Electric Power University,
Beijing 102206, China;
2. National Thermal Power Engineering & Technology Research Center, Beijing 102206, China;
3. Department of Electrical Engineering New Materials & Microelectronics,
State Grid Smart Grid Research Institute, Beijing 102211, China）
Abstract: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%.
Key words: conductor material; aluminum alloy; AlFeSi phase; electrical conductivity; ageing treatment
