Ce对Al-Zn-Mg-Cu-Sc合金组织和力学性能的影响
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摘要
为了研究Ce元素对T6态Al-7.5Zn-2Mg-2.3Cu-0.1Sc合金显微组织和力学性能的影响,通过改变合金中Ce元素的添加量,采用光学显微镜、扫描电子显微镜和电子万能实验机对合金的显微组织、拉伸断口形貌和力学性能进行了研究.结果表明,加入质量分数为0.2%的Ce元素可以显著细化Al-7.5Zn-2Mg-2.3Cu-0.1Sc合金的铸态和T6态显微组织.在合金的T6处理过程中随着时效时间的增加,合金硬度和抗拉强度均先增加后降低,合金的硬度和抗拉强度峰值分别为216 HB和681.7 MPa,合金最高屈服强度为638.2 MPa.合金拉伸断口呈韧脆混合断裂特征.
In order to study the effect of Ce element on both microstructure and mechanical properties of T6 treated Al-7. 5 Zn-2 Mg-2. 3 Cu-0. 1 Sc alloy,the addition amount of Ce element in the alloy was changed,and the microstructure,morphologies of tensile fracture surfaces and mechanical properties of the alloy were investigated with the optical microscope,scanning electron microscope( SEM) and electronic universal testing machine. The results showthat after adding the Ce element with the mass fraction of 0. 2%,the microstructures of the alloy with as-cast and T6 treated states can be obviously refined. In the T6 treatment process of the alloy,the hardness and ultimate tensile strength of the alloy firstly increase and then decrease with increasing the aging time. In addition,the peak hardness and ultimate tensile strength of the alloy are216 HB and 681. 7 MPa,and the maximum yield strength is 638. 2 MPa. The tensile fracture surfaces of the alloy showthe mixed ductile-brittle fracture feature.
In order to study the effect of Ce element on both microstructure and mechanical properties of T6 treated Al-7. 5 Zn-2 Mg-2. 3 Cu-0. 1 Sc alloy,the addition amount of Ce element in the alloy was changed,and the microstructure,morphologies of tensile fracture surfaces and mechanical properties of the alloy were investigated with the optical microscope,scanning electron microscope( SEM) and electronic universal testing machine. The results showthat after adding the Ce element with the mass fraction of 0. 2%,the microstructures of the alloy with as-cast and T6 treated states can be obviously refined. In the T6 treatment process of the alloy,the hardness and ultimate tensile strength of the alloy firstly increase and then decrease with increasing the aging time. In addition,the peak hardness and ultimate tensile strength of the alloy are216 HB and 681. 7 MPa,and the maximum yield strength is 638. 2 MPa. The tensile fracture surfaces of the alloy showthe mixed ductile-brittle fracture feature.
引文
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[4]吴颖,温彤,朱曾涛.7×××系铝合金时效处理的研究现状及应用进展[J].材料导报,2012,26(15):114-118.(WU Ying,WEN Tong,ZHU Zeng-tao.Development of research and application of aging treatment technology on 7×××series aluminum alloys[J].Materials Review,2012,26(15):114-118.)
[5]王孟云.稀土元素在铝合金中作用的研究[J].铸造技术,2013,34(3):290-292.(WANG Meng-yun.Study on effect of rare earth in aluminum alloys[J].Foundry Technology,2013,34(3):290-292.)
[6]刘黄,罗兵辉,柏振海.Sc、Zr对Al-Zn-Mg-Cu合金组织与性能的影响[J].轻合金加工技术,2006,34(2):43-47.(LIU Huang,LUO Bing-hui,BO Zhen-hai.Effect of Sc and Zr addition on microstractures and properties of Al-Zn-Mg-Cu alloys[J].Light Alloy Fabrication Technology,2006,34(2):43-47.)
[7]Fang H C,Chao H,Chen K H.Effect of Zr,Er and Cr additions on microstructures and properties of Al-ZnMg-Cu alloys[J].Materials Science and Engineering A,2014,610:10-16.
[8]王少华,马志锋,张显峰,等.Al-Zn-Mg-Cu-Zr-0.5Er合金型材组织性能研究[J].材料工程,2014(3):27-33.(WANG Shao-hua,MA Zhi-feng,ZHANG Xianfeng,et al.Investigation on microstructure and properties of A1-Zn-Mg-Cu-Zr-0.5Er alloy profile[J].Journal of Materials Engineering,2014(3):27-33.)
[9]刘华娜,杨光昱,齐元昊.Sc对Al-Zn-Mg-Cu系铸造铝合金组织与性能的影响[J].铸造,2013,62(1):4-8.(LIU Hua-na,YANG Guang-yu,QI Yuan-hao.Effects of Sc on the microstructures and mechanical properties of Al-Zn-Mg-Cu casting aluminum alloy[J].Foundry,2013,62(1):4-8.)
[10]赖建平.微合金化(Ce,Sn)对Al-Zn-Mg-Cu合金组织与性能的影响[D].长沙:中南大学,2011.(LAI Jian-ping.Effect of micro alloying(Ce,Sn)on microstructure and properties of Al-Zn-Mg-Cu alloy[D].Changsha:Central South University,2011.)
[11]夏朝峰,王良龙,陈思悦,等.Al-Zn-Mg-Cu合金时效析出相的研究[J].材料热处理学报,2011,32(增刊1):79-82.(XIA Chao-feng,WANG Liang-long,CHEN Si-yue,et al.Research of precipitates in a Al-Zn-Mg-Cu alloy after aging[J].Transactions of Materials and Heat Treatment,2011,32(Sup1):79-82.)