Cu含量对低频电磁铸造新型高强Al-Mg-Si-Cu合金组织性能的影响  

Effect of Cu content on microstructure and mechanical properties of a new high strength Al-Mg-Si-Cu alloy prepared by low frequency electromagnetic casting

作　　者：蒙毅[1] 孙健[1] 赵志浩[2] 崔建忠[2] 朱远志[1] 

机构地区：[1]北方工业大学机械与材料工程学院,北京100144 [2]东北大学材料电磁过程研究教育部重点实验室,辽宁沈阳110819

出　　处：《材料热处理学报》2017年第8期48-54,共7页Transactions of Materials and Heat Treatment

基　　金：北京市优秀人才培养资助青年骨干个人项目(2015000020124G023);北方工业大学"优秀青年教师培养计划"项目(XN072-017);北方工业大学科研启动基金(1100000156041-2015)

摘　　要：采用显微组织观察、扫描电镜及能谱分析、透射电镜分析、DSC热差分析、JMat Pro 5.0软件计算和室温力学性能测试,对低频电磁铸造新型高强Al-Mg-Si-Cu合金铸态、挤压态和T6态的组织与力学性能进行研究,获得该合金的最佳Cu含量。结果表明,Cu含量的变化对该合金过烧温度影响很小,不同含Cu量的该类合金进行均匀化处理和固溶处理时温度可相同。Cu在该合金铸态组织中除了形成球状AlMgSiCu相外,含Cu相还可与其他相结合形成球状共晶组织。Cu对合金再结晶行为的影响很小。随Cu含量的增加,合金T6态试样中Q'析出强化相的数量增加,同时该合金挤压棒材T6态试样的强度和伸长率也增加。在限定的元素含量范围内,提高Cu含量至1.0 mass%,合金的强韧性可达到最佳状态。The effects of Cu content on microstructure and mechanical properties of as-cast,as-extruded and T6 states of a new highstrength Al-Mg-Si-Cu alloy prepared by low frequency electromagnetic casting（LFEC） were studied by means of optical microscope,scanning electron microscopy（SEM）,energy dispersive spectroscopy（EDS）,transmission electron microscopy（TEM）,DSC analysis,JMat Pro 5.0 software and mechanical test at room temperature,and the optimum Cu content of the alloy was obtained.The results show that the change of Cu content has little influence on the over-burn temperature of the alloy,and the homogenization and solid solution temperature of the alloy with different Cu contents can be determined as the same.The addition of Cu in the as-cast alloy results in the appearance of spherical AlMgSiCu phases and the formation of eutectic phases between the Cu-containing phases and other phases.The content of Cu has little effect on the recrystallization behavior of the extruded alloys.With the increasing of the Cu content,the number of Q＇ phase in the T6 alloy increases,and the strength and the elongation of the T6 alloy increase too.In a limited range of element content of the alloy,when increasing the content of Cu to 1 mass%,the best combination of strength and toughness of the alloy can be obtained.

关 键 词：铝合金 高强 显微组织 CU 

分 类 号：TG146.21[一般工业技术—材料科学与工程]