Sc对Al-Zn-Mg-Cu-Zr合金挤压铸造组织性能的影响  

Effect of Sc Addition on Microstructures and Properties of the Squeeze Cast Al-Zn-Mg-Cu-Zr Alloy

作　　者：何敏[1] 李豹[1] 高志华[1] 徐骏[1] 

机构地区：[1]北京有色金属研究总院国家有色金属复合材料工程技术研究中心

出　　处：《特种铸造及有色合金》2016年第6期597-600,共4页Special Casting & Nonferrous Alloys

基　　金：国家国际科技合作专项资助项目(2013DFA51370)

摘　　要：采用电阻炉熔炼了Al-7.2Zn-2.2Mg-1.8Cu-0.2Zr和Al-7.2Zn-2.2Mg-1.8Cu-0.2Sc-0.2Zr两种铝合金,在700~720℃挤压铸造成形,并经过465℃×24h＋475℃×8h水淬＋120℃×24h时效热处理。结果表明,Sc、Zr的复合添加能明显细化α-Al基体和晶间第二相;通过多级固溶和时效处理,显著提高了合金的力学性能,铸件的抗拉强度达到613MPa,屈服强度达到528 MPa,伸长率为6%。Al-7.2Zn-2.2Mg-1.8Cu-0.2Zr alloy and Al-7.2Zn-2.2Mg-1.8Cu-0.2Sc-0.2Zr alloy were prepared by resistance furnace.The two alloy samples were produced by squeeze casting at 700~720 ℃,which was treated at 465 ℃×24＋475 ℃×8hsolid solution,water quenching ＋120 ℃×24haging.The results show that through the addition of trace element Sc and Zr,theα-Al phase and the second phase intercrystalline in the Al-Zn-Mg-Cu alloys are refined effectively.Through the multi-stage solid solution and aging treatment,the mechanical properties of alloy are improved significantly,where the tensile strength,yield strength and elongation of the samples reach up to 613 MPa,528 MPa,6%,respectively.

关 键 词：AL-ZN-MG-CU合金 SC 挤压铸造 组织性能 

分 类 号：TG249.2[金属学及工艺—铸造]