何项项,林波,范滔,郑成坤,张卫文

• 1:贵州大学机械工程学院
• 2:华南理工大学机械与汽车工程学院

摘要(Abstract)：

采用不同压力的挤压铸造方法制备了不同Fe含量的Al-7.1Zn-2.4Mg-2.1Cu合金,研究了Fe含量和压力对挤压铸造合金组织和力学性能的影响,并重点分析了合金的断裂行为。结果表明:铸态下,合金中富铁相为汉字状Al_6(CuFe),T4热处理后,富铁相Al_6(CuFe)部分转变为富铜的Al_7Cu_2Fe相。相比重力铸造合金,挤压铸造高铁含量Al-7.1Zn-2.4Mg-2.1Cu合金力学性能得到显著的提升,降低了富铁相的危害,这主要归因于压力作用下组织细化和铸造缺陷的减少。75 MPa压力下,含铁量为0.55 mass%的合金经T4热处理后的抗拉强度为464 MPa,屈服强度为325 MPa,伸长率为8.9%。

关键词(KeyWords)： Al-Zn-Mg-Cu合金;挤压铸造;Fe含量;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(52074131,51704084);; 贵州省千层次创新型人才项目(贵大“千”层次[2018]03);; 贵州省自然科学基金一般项目(黔科合基础-ZK[2021]一般267);; 贵州省科技成果应用及产业化项目(黔科合成果[2021]一般067);; 贵州大学培育项目(2019[23])

作者(Author): 何项项,林波,范滔,郑成坤,张卫文

DOI: 10.13289/j.issn.1009-6264.2021-0257

参考文献(References)：

• [1] 丁云峰，陈康华，袁丁玲，等.新型非等温时效制度对Al-Zn-Mg-Cu合金力学性能与腐蚀性能的影响[J].材料热处理学报，2021,42(2):27-36.DING Yun-feng,CHEN Kang-hua,YUAN Ding-ling,et al.Effect of new non-isothermal aging on mechanical propertied and corrosion resistance of Al-Zn-Mg-Cu alloy[J].Transactions of Materials and Heat Treatment,2021,42(2):27-36.
• [2] Zhao K,Gao T,Yang H B,et al.Enhanced grain refinement and mechanical properties of a high-strength Al-Zn-Mg-Cu-Zr alloy induced by TiC nano-particles[J].Materials Science and Engineering A,2021,806:140852.
• [3] 侯文胜，陈刚，孙广东，等.热处理对含钇Al-Si-Fe/Al-20Si复合材料组织及性能的影响[J].材料热处理学报，2013,34(6):5-10.HOU Wen-sheng,CHEN Gang,SUN Guang-dong,et al.Effects of heat treatment on microstructure and properties of Al-Si-Fe/Al-20Si composites containing yttrium[J].Transactions of Materials and Heat Treatment,2013,34(6):5-10.
• [4] Hu K,Lin C H,Xia S C,et al.Effect of Fe content on low cycle fatigue behavior of squeeze cast Al-Zn-Mg-Cu alloys[J].Materials Characterization,2020,170:110680.
• [5] Wen K,Xiong B Q,Ren W C,et al.Fe-rich particles influenced secondary crack characteristics in an Al-Zn-Mg-Cu alloy extrusion plate with high zinc content[J].Scripta Materialia,2020,186:259-262.
• [6] 佘欢，疏达，储威，等.Fe和Si杂质元素对7xxx系高强航空铝合金组织及性能的影响[J].材料工程，2013(6):92-98.SHE Huan,SHU Da,CHU Wei,et al.Effect of Fe and Si Impurities on the microstructure and properties of 7xxx high strength aircraft aluminum alloys[J].Journal of Materials Engineering,2013(6):92-98.
• [7] 孙跃军，高艳静，崔泽文，等.固溶处理对液态模锻6061铝合金显微组织的影响[J].材料热处理学报，2018,39(2):82-87.SUN Yue-jun,GAO Yan-jing,CUI Ze-wen,et al.Effect of solid solution treatment on microstructure of liquid forging 6061 aluminum alloy[J].Transactions of Materials and Heat Treatment,2018,39(2):82-87.
• [8] Wang F F,Meng W,Zhang H W,et al.Effects of under-aging treatment on microstructure and mechanical properties of squeeze-cast Al-Zn-Mg-Cu alloy[J].Transactions of Nonferrous Metals Society of China,2018,28(10):1920-1927.
• [9] Liu T W,Wang Q D,Tang H P,et al.Microstructure and mechanical properties of squeeze-cast Al-5.0Mg-3.0Zn-1.0Cu alloys in solution-treated and aged conditions[J].Transactions of Nonferrous Metals Society of China,2020,30(9):2326-2338.
• [10] Lin B,Zhang W,Zheng X,et al.Developing high performance mechanical properties at elevated temperature in squeeze cast Al-Cu-Mn-Fe-Ni alloys[J].Materials Characterization,2019,150:128-137.
• [11] Lin B,Xu R,Li H Y,et al.Development of high Fe content squeeze cast 2A16 wrought Al alloys with enhanced mechanical properties at room and elevated temperatures[J].Materials Characterization,2018,142:389-397.
• [12] Dong J X,Kapnezis P A,Durrant G,et al.The effect of Sr and Fe additions on the microstructure and mechanical properties of a direct squeeze Al-7Si-0.3Mg alloy[J].Metallurgical and Materials Transactions A,1999,30:1341-1356.
• [13] 卢磊，张大童，张卫文，等.浇注温度和固溶温度对挤压铸造Al-6.8Zn-2.5Mg-2.0Cu合金组织和性能的影响[J].特种铸造及有色合金，2014,34(5):492-495.LU Lei,ZHANG Da-tong,ZHANG Wei-wen,et al.Effects of pouring temperature and solid solution temperature on temperature on microstructure and mechanical properties of squeeze casting Al-6.8Zn-2.5Mg-2.0Cu alloy[J].Special-cast and Non-ferrous Alloys,2014,34(5):492-495.
• [14] She H,Shu D,Chu W,et al.Microstructural aspects of second phases in as-cast and homogenized 7055 aluminum alloy with different impurity contents[J].Metallurgical and Materials Transactions A,2013,44:3504-3510.
• [15] Mukhopadhyay A K.On the nature of the Fe-bearing particles influencing hard anodizing behavior of AA 7075 extrusion products[J].Metallurgical and Materials Transactions A,1998,29(13):979-987.
• [16] 胡汉起.金属凝固原理(第2版)[M].北京：机械工业出版社，1998:80-82.
• [17] 罗守靖，陈炳光，齐丕骧.液态模锻与挤压铸造技术[M].北京：化学工业出版社，2006.
• [18] Liu T,Karkkainen M,Nastac L,et al.Iron-rich intermetallics in high pressure die cast A383 aluminum alloys[J].Intermetallics,2020,126:106814.
• [19] Liu C F,Jiao X Y,Nishat H,et al.Characteristics of Fe-rich intermetallics compounds and their influence on the cracking behavior of a newly developed high-pressure die cast Al-4Mg-2Fe alloy[J].Journal of Alloys and Compounds,2021,854:157121.
• [20] Tseng C J,Lee S L,Wu T F,et al.Effects of Fe content on microstructure and mechanical properties of A206 alloy[J].Materials Transactions,JIM,2000,41(6):708-713.
• [21] Kamga H K,Larouche D,Bournane M,et al.Mechanical properties of aluminium-copper B206 alloys with iron and silicon additions[J].International Journal of Cast Metals Research,2012,25(1):15-25.
• [22] Liu K,Cao X,Chen X G.Tensile properties of Al-Cu 206 cast alloys with various iron contents[J].Metallurgical and Materials Transactions A,2014,45(5):2498-2507.
• [23] Major J F,Sigworth G K.Chemistry/property relationships in AA 206 alloys[J].Transactions-American Foundrymens Society,2006,114:117.

文章评论(Comment)：