Effects of Different Ageing Processes on Microstructure and Mechanical Properties of 2023 Aluminum Alloy Containing Trace Additon of Sc and Zr
摘 要
采用显微硬度仪、拉伸试验机、光学显微镜和透射电镜等方法研究了不同时效工艺对含有微量元素钪和锆2023铝合金组织和力学性能的影响。结果表明: 2023铝合金在T8峰时效态下的硬度、抗拉强度以及屈服强度分别比T6峰时效态下的高25 HV、37 MPa、108 MPa, 但伸长率降低了67%; 钪和锆的添加能使合金中形成细小弥散分布的Al3Sc1-xZrx粒子, 促进S′相均匀而细小地析出, 该粒子能有效钉扎位错, 细化晶粒, 抑制再结晶和晶粒长大, 使合金获得较少的再结晶组织; 微量钪和锆能加快合金在T6状态下的时效响应速度, 提高其时效硬化能力, 并改善合金的强度和塑性; 但是在T8状态下, 随着位错的大量引入, 钪和锆的这些作用被减弱。
Abstract
The effects of different ageing processes on microstructure and mechanical properties of 2023 aluminum alloy containing trace addition of Sc and Zr were studied by microhardness testing, tensile testing, optical microscopy and transmission electron microscopy. The results show that the hardness, tensile strength and yield strength of the 2023 alloy in T8 peak ageing state were higher than those in T6 peak ageing state by 25 HV, 37 MPa and 108 MPa, respectively, but the elongation of the alloy decreased by 67%. With the addition of Sc and Zr, fine and dispersed Al3(Sc1-xZrx)particles precipitated in the alloy, and thus to promote S′ phase precipitation with homogeneous and small grains. The Al3(Sc1-xZrx)particles could pin the dislocations and refine grains, also inhibit the recrystallization and growth of the grains, so the alloy obtained the microstructure with fairy few of recrystallization. Trace addition of Sc and Zr could accelerate the ageing responce rate of the alloy in T6 state, increase its ageing harding performance and promote the strength and plasticity of the alloy. But the effects of Sc and Zr were weakened in T8 state because a lot of dislocations were introduced in that state.
中图分类号 TG146
所属栏目 新材料新工艺
基金项目 国家重点基础研究发展规划资助项目(2005CB623705)
收稿日期 2012/6/26
修改稿日期 2013/3/25
网络出版日期
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备注钟继发(1989—), 男, 湖南邵阳人, 硕士研究生。
引用该论文: ZHONG Ji-fa,ZHENG Zi-qiao,LUO Xian-fu,CHENG Bin. Effects of Different Ageing Processes on Microstructure and Mechanical Properties of 2023 Aluminum Alloy Containing Trace Additon of Sc and Zr[J]. Materials for mechancial engineering, 2013, 37(8): 72~76
钟继发,郑子樵,罗先甫,程彬. 时效工艺对含微量钪和锆2023铝合金组织和力学性能的影响[J]. 机械工程材料, 2013, 37(8): 72~76
被引情况:
【1】李赫亮,袁晓光,吴明富,黄宏军, "变形及热处理对含锆的铝镁硅铜合金显微组织的影响",机械工程材料 38, 28-31(2014)
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参考文献
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【3】郑子樵, 李劲风, 陈志国, 等.铝锂合金的合金化与微观组织演化[J].中国有色金属学报, 2011, 12(10): 2337-2351.
【4】罗先甫, 郑子樵, 葛婧萱, 等.Zn及热处理制度对 2056 铝合金力学性能及局部腐蚀行为的影响[J].粉末冶金材料科学与工程, 2012, 17(1): 55-62.
【5】FULLER C B, SEIDMAN D N. Temporal evolution of the nanostructure of Al(Sc, Zr) alloys-Part II: coarsening of Al3(Sc1-xZrx) precipitates[J].Acta Materialia, 2005, 53(20): 5415-5428.
【6】HANSSON L H, TACK W T. Aluminum alloys containing scandium with zirconium additions: US, 5620652[P].1997-04-15.
【7】KOLOBNEV N I. Aluminum-lithium alloys with scandium[J].Metal Sci and Heat Treatment, 2002, 44(7/8): 297-299.
【8】TAN C Y, ZHENG Z Q, XIA C Q. The aging feature of Al-Li-Cu-Mg-Zr alloy containing Sc[J].Journal of Central South University of Technology, 2000, 7(2): 65-67.
【9】郭加林, 尹志民, 王华, 等.微量Sc和Zr对2524SZ合金薄板疲劳裂纹扩展特性的影响[J].中国有色金属学报, 2010, 20(5): 827-832.
【10】李成功, 巫世杰, 戴圣龙, 等.先进铝合金在航空航天工业中的应用与发展[J].中国有色金属学报, 2002, 12(增1): 14-21.
【11】蒋春丽, 姜锋, 许栩达, 等.Al-Cu-Mg-Sc-Zr合金均匀化制度的研究[J].热加工工艺, 2008(4): 10-12.
【12】王芝秀, 郑子樵, 李海.少量Sc对Al-Mg-Cu-Li-Zr合金组织与性能的影响[J].材料热处理学报, 2008, 29(2): 90-94.
【13】NORMAN A F, PRANGNELL P B, MCEWEN R S. The solidification behavior of dilute aluminium-scandium alloys[J].Acta Materialia, 1998, 46(16): 5715-5732.
【14】蒋晓军, 李依依.Sc对Al-Li-Cu-Mg-Zr合金组织与性能的影响[J].金属学报, 1994, 30(8): A355-A360.
【15】HUANG B P, ZHENG Z Q.Independent and combined roles of trace Mg and Ag additions in properties precipitation process and precipitation kinetics of Al-Cu-Li-(Mg)-(Ag)-Zr-Ti alloys[J].Acta Materialia, 1998, 46(12): 4381-4393.
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