Zn、Mg、Cu对铸造Al-Zn-Mg-Cu合金强度和热裂性能的影响  

Influence of Zn,Mg and Cu Contents on Strength andHot Crack of Cast Al-Zn-Mg-Cu Alloys

作　　者：陈晓[1] 黄胜[1] 武荣召[1] 

机构地区：[1]福州大学机械工程及自动化学院

出　　处：《特种铸造及有色合金》2012年第4期306-310,共5页Special Casting & Nonferrous Alloys

基　　金：福建省自然科学基金资助项目(2009J01245)

摘　　要：采用正交试验,研究了Zn、Mg、Cu3种元素对铸造Al-Zn-Mg-Cu合金力学性能和热裂倾向的影响。结果表明,3种元素对合金的抗拉强度和热裂倾向影响不同。对抗拉强度影响次序为:Zn>Mg>Cu;对热裂的影响次序为Cu=Mg>Zn。在试验范围内,随着Zn含量增加,抗拉强度和热裂倾向增大;随着Cu含量增大,抗拉强度和热裂倾向减少;随着Mg含量增加,抗拉强度先增大后减小,热裂倾向先减小后增大。低熔点晶间共晶组织对抗拉强度和热裂有重要的影响,随着共晶组织数量的增加,强度下降,热裂倾向先减小后增大。Influence of Zn,Mg and Cu elements on mechanical properties and hot cracking tendencies of cast Al-Zn-Mg-Cu alloys were investigated by using orthogonal experiment method.The results show that the influence of three elements on the tensile strength and hot cracking tendency of alloys is distinct.The influencing sequence on the tensile strength is as follows：ZnMgCu,while the order of affecting hot cracking tendency is Cu=MgZn.In the experiment range,tensile strength and hot crack tendency are increased with increasing in Zn content,and decreased with increasing in Cu content,respectively.However,with Mg content increases,tensile strength shows firstly increased and then decreased,while hot crack tendency shows firstly decreased and then increased.The eutectic phase with low melting point and along the grain boundary has important effect on tensile strength and hot cracking,where with the eutectic number increases,tensile strength is decreased,and hot tearing tendency is firstly reduced and then increased.

关 键 词：铸造Al-Zn-Mg-Cu合金 合金元素 热裂倾向 抗拉强度 

分 类 号：TG292[金属学及工艺—铸造]