Mg、Sc对铸造铝合金导热和力学性能的影响
|
摘要
为了满足散热器件对压铸铝合金材料越来越高的导热及力学性能要求,在Al-Si-Fe系铸造铝合金中引入Mg、Sc元素,通过金相及SEM/EDS检测,考察了合金在不同元素添加量及不同冷却速率下的微观组织,并分析其导热及力学性能。结果表明,Mg、Sc元素的添加均会降低合金的导热系数,提高其强度,且Sc元素的影响幅度略低于Mg。当Sc添加量为0.2%时,Al-9Si-0.7Fe-0.2Sc合金的导热系数为153.9W/(m·K),屈服强度为92.9MPa,抗拉强度为197.3MPa,综合性能较好。
Elements of Mg and Sc were introduced into the Al-Si-Fe casting aluminum alloy in order to meet the higher requirements of thermal conductivity and mechanical properties for heatsink materials.The microstructure of alloys prepared with different components and cooling rates was investigated by OM,SEM and EDS,and the corresponding thermal conductivity and mechanical properties were measured.The results show that,both the addition of Mg and Sc elements can decrease the thermal conductivity and improve the mechanical properties of the alloy.In addition,Sc element exhibits less impact on the properties compared with Mg element.The satisfied comprehensive performance can be obtained with 0.2% Sc element is,where the thermal conductivity,yield strength and tensile strength reach 153.9 W/(m·K),92.9 MPa and 197.3 MPa,respectively.
Elements of Mg and Sc were introduced into the Al-Si-Fe casting aluminum alloy in order to meet the higher requirements of thermal conductivity and mechanical properties for heatsink materials.The microstructure of alloys prepared with different components and cooling rates was investigated by OM,SEM and EDS,and the corresponding thermal conductivity and mechanical properties were measured.The results show that,both the addition of Mg and Sc elements can decrease the thermal conductivity and improve the mechanical properties of the alloy.In addition,Sc element exhibits less impact on the properties compared with Mg element.The satisfied comprehensive performance can be obtained with 0.2% Sc element is,where the thermal conductivity,yield strength and tensile strength reach 153.9 W/(m·K),92.9 MPa and 197.3 MPa,respectively.
引文
[1]吴孟武,华林,周建新,等.导热铝合金及铝基复合材料的研究进展[J].材料导报,2018,32(5):1 486-1 495.
[2]毛文龙,周海涛,王顺成,等.Sr变质对Al-Si-Mg合金的流动性、力学性能和导热系数的影响[J].铸造,2017,66(2):122-126.
[3]牛艳萍,赵禹凯,王顺成,等.Si含量对Al-Si-Mg合金铸造流动性、热导率和力学性能的影响[J].铸造,2016,65(4):366-370.
[4]张瑞忠,张保存,邹纯,等.高导热AlSi12Fe铸造铝合金的组织和性能[J].轻合金加工技术,2018,46(8):18-23.
[5]KARABAY S.Modificatioon of AA-6201alloy for manufacturing of high conductivity and extra high conductivity wires with property of high tensile stress after artificial aging heat treatment for all aluminum alloy conductors[J].Materials&Design,2006,27:821.
[6]郑洪,林顺岩.铝钪合金的研究与开发[J].铝加工,2005,164:43-47.
[7]林冲,吴树森,吕书林,等.超声对Al-14Si-xFe-yMn合金富Fe相和性能的影响[J].特种铸造及有色合金,2018,38(1):105-109.
[8]李林君.高性能热传导6063铝合金材料的研究[D].南宁:广西大学,2015.
[9]SHIN J S,KO S H,KIM K T.Development and characterization of low-silicon cast aluminum alloys for thermal dissipation[J].Journal of Alloys and Compounds,2015,644:673-686.
[10]毛文龙,赵禹凯,王顺成,等.晶粒细化对铸造Al-3.2Si-0.8Mg合金流动性、力学性能和导热系数的影响[J].材料导报,2016,30(Z1):85-88.
[11]肖代红,巢宏,陈康华,等.微量Sc对AA7085铝合金组织与性能的影响[J].中国有色金属学报,2008,18(12):2 145-2 150.
[12]周士昂.基于稀土元素Sc改性Al-Mg新型铝合金的组织控制与强化机理研究[D].合肥:合肥工业大学,2016.
[13]CHOI S W,KIM Y M,LEE K M,et al.The effects of cooling rate and heat treatment on mechanical and thermal characteristics of Al-Si-Cu-Mg foundry alloys[J].Journal of Alloys and Compounds,2014,617:654-659.
[14]李明.A356铝合金半固态流变成形中凝固行为及组织控制[D].兰州:兰州理工大学,2018.
[15]刘艳辉,毛红奎,刘佩叶,等.冷却速度对ZM5镁合金凝固组织与性能的影响[J].铸造,2017,66(3):286-289.
[2]毛文龙,周海涛,王顺成,等.Sr变质对Al-Si-Mg合金的流动性、力学性能和导热系数的影响[J].铸造,2017,66(2):122-126.
[3]牛艳萍,赵禹凯,王顺成,等.Si含量对Al-Si-Mg合金铸造流动性、热导率和力学性能的影响[J].铸造,2016,65(4):366-370.
[4]张瑞忠,张保存,邹纯,等.高导热AlSi12Fe铸造铝合金的组织和性能[J].轻合金加工技术,2018,46(8):18-23.
[5]KARABAY S.Modificatioon of AA-6201alloy for manufacturing of high conductivity and extra high conductivity wires with property of high tensile stress after artificial aging heat treatment for all aluminum alloy conductors[J].Materials&Design,2006,27:821.
[6]郑洪,林顺岩.铝钪合金的研究与开发[J].铝加工,2005,164:43-47.
[7]林冲,吴树森,吕书林,等.超声对Al-14Si-xFe-yMn合金富Fe相和性能的影响[J].特种铸造及有色合金,2018,38(1):105-109.
[8]李林君.高性能热传导6063铝合金材料的研究[D].南宁:广西大学,2015.
[9]SHIN J S,KO S H,KIM K T.Development and characterization of low-silicon cast aluminum alloys for thermal dissipation[J].Journal of Alloys and Compounds,2015,644:673-686.
[10]毛文龙,赵禹凯,王顺成,等.晶粒细化对铸造Al-3.2Si-0.8Mg合金流动性、力学性能和导热系数的影响[J].材料导报,2016,30(Z1):85-88.
[11]肖代红,巢宏,陈康华,等.微量Sc对AA7085铝合金组织与性能的影响[J].中国有色金属学报,2008,18(12):2 145-2 150.
[12]周士昂.基于稀土元素Sc改性Al-Mg新型铝合金的组织控制与强化机理研究[D].合肥:合肥工业大学,2016.
[13]CHOI S W,KIM Y M,LEE K M,et al.The effects of cooling rate and heat treatment on mechanical and thermal characteristics of Al-Si-Cu-Mg foundry alloys[J].Journal of Alloys and Compounds,2014,617:654-659.
[14]李明.A356铝合金半固态流变成形中凝固行为及组织控制[D].兰州:兰州理工大学,2018.
[15]刘艳辉,毛红奎,刘佩叶,等.冷却速度对ZM5镁合金凝固组织与性能的影响[J].铸造,2017,66(3):286-289.