高强韧Al-Si-Mg合金材料设计与制备  

Design and Preparation of High Strength and Toughness Al-Si-Mg AlloyMaterial

作　　者：姜坤 赵凯 林翰 刘桂亮 阎汐睿 刘相法[1] JIANG Kun;ZHAO Kai;LIN Han;LIU Gui-liang;YAN Xi-rui;LIU Xiang-fa(Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials,Ministry of Education,Shandong University,Jinan 250061,Shandong,China;Guizhou Aerospace Fenghua Precision Equipment Co.,Ltd.,Guiyang 550000,Guizhou,China;Shandong Al&Mg Melt Technology Limited Company,Jinan 250061,Shandong,China)

机构地区：[1]山东大学材料液固结构演变与加工教育部重点实验室,山东济南250061 [2]贵州航天风华精密设备有限公司铸造工程中心,贵州贵阳550000 [3]山东吕美熔体技术有限公司,山东济南250061

出　　处：《铸造》2021年第6期681-686,共6页Foundry

基　　金：国家自然科学基金(51731007&52071189);济南市“高校20条”资助自主创新培养团队项目(2019GXRC002)。

摘　　要：为获得高强韧Al-Si-Mg合金,以亚共晶Al-Si-Mg合金为研究对象,探究了ASN晶种合金对其组织及室温力学性能的影响。试验结果表明:未添加ASN晶种合金时,Al-Si-Mg合金中α-Al晶粒粗大,枝晶发达,共晶组织分布不均匀;而向Al-Si-Mg合金中添加1%的ASN晶种合金后,α-Al晶粒得到一定细化,枝晶生长受到抑制,共晶组织分布较弥散均匀;此外,引入ASN晶种合金后,Al-Si-Mg合金的布氏硬度由HBW107.8提升至HBW127.4,提高了18.2%;室温抗拉强度由325 MPa提升至390 MPa,屈服强度由240 MPa提升至345 MPa,分别提高了20.0%和43.8%。ASN晶种合金有效地改善了Al-Si-Mg合金的组织,提高了其室温力学性能,从而获得了高强韧Al-Si-Mg合金。In order to obtain high strength and toughness Al-Si-Mg alloy,hypoeutectic Al-Si-Mg alloy was used as the research object,and the influence of ASN master alloy on its structure and room temperature mechanical properties was explored.The results show thatα-Al dendrites are extraordinary coarse and eutectic structure is unevenly distributed in Al-Si-Mg alloy.However,when 1%ASN seed alloy is added to Al Si Mg alloy,theα-Al grains are refined,the dendrite growth is inhibited,and the eutectic structure is well distributed.In addition,the Brinell hardness of Al-Si-Mg alloy is increased from HBW107.8 to HBW127.4,with an increase of 18.2%;the room temperature tensile strength is increased from 325 MPa to 390 MPa,and the yield strength from 240 MPa to 345 MPa,by 20.0%and 43.8%,respectively.Conclusively,the addition of ASN master alloy optimize the microstructure of Al-Si-Mg alloy and improve its mechanical properties.Therefore,high strength and toughness Al-Si-Mg alloy is obtained.

关 键 词：AL-SI-MG合金 ASN晶种合金 微观组织 力学性能 高强韧 

分 类 号：TG146.2[一般工业技术—材料科学与工程]