采用X射线衍射分析(XRD)、电子背散射衍射分析(EBSD)、电导率测试、硬度测试、晶间腐蚀试验和剥落腐蚀试验,研究了预回复固溶时效处理前的热机械加工(Thermo-mechanical processing,TMP)对超高强铝合金Al-13.01Zn-3.16Mg-2.8Cu-0.2Zr-0.07Sr组织及性能的影响.结果表明,TMP(450℃/2 h+460℃/2 h +470℃/2 h(水淬)固溶、400℃/24 h过时效、约45％压缩量)处理后降低了合金的位错密度(0.150→0),减小了平均晶粒尺寸(6.256μm→5.012 μm)和平均晶界角度,显著提高了低角度晶界数目百分比(0.618→0.700),电导率(25.3％IACS→ 27.2％IACS)和伸长率(8.1％→8.2％)基本未发生变化,降低了硬度(229.6 HV→221.0 HV)、屈服强度(653.8 MPa→599.5 MPa)、抗拉强度(701.9 MPa→646.3 MPa),提高了抗晶间腐蚀和抗剥落腐蚀性能.定量分析显示,热机械加工轻微提高了合金位错强化、低角度晶界强化和高角度晶界强化的总强化,合金强度的降低主要归因于合金固溶强化和时效沉淀析出相强化的总强化的降低.抗腐蚀性能的提高可以归因于合金低角度晶界数目百分比的提高.
参考文献
| [1] | Tolga Dursun;Costas Soutis.Recent developments in advanced aircraft aluminium alloys[J].Materials & design,2014Apr.(Apr.):862-871. |
| [2] | 方华婵;陈康华;巢宏;陈祥;叶登峰.Al-Zn-Mg-Cu系超强铝合金的研究现状与展望[J].粉末冶金材料科学与工程,2009(6):351-358. |
| [3] | Yun-Lai Deng;Li Wan;YongZhang.Evolution of microstructures and textures of 7050 Al alloy hot-rolled plate during staged solution heat-treatments[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,20101(1):88-94. |
| [4] | 孙才;董立新;刘力菱.固溶处理对7075铝合金显微组织与力学性能的影响[J].热加工工艺,2010(24):249-251,256. |
| [5] | 张振强;许晓静;宋涛;张允康;罗勇;吴瑶;邓平安.热机械加工对2099铝锂合金挤压材组织与抗腐蚀性能的影响[J].稀有金属材料与工程,2013(12):2619-2624. |
| [6] | 李海;郑子樵;王芝秀.过时效-重固溶-再时效处理对 7055铝合金组织与性能的影响[J].材料热处理学报,2004(3):57-61. |
| [7] | K.M. Youssef;R.O. Scattergood;K.L. Murty.Nanocrystalline Al-Mg Alloy with Ultrahigh Strength and Good Ductility[J].Scripta materialia,20062(2):251-256. |
| [8] | XU Xiao-jing;GAO Jin-qi;CHENG Xiao-nong;MO Ji-ping.Tensile properties of 2024 Al alloy processed by enhanced solid-solution and equal-channel angular pressing[J].中国有色金属学会会刊（英文版）,2006(z3):1541-1544. |
| [9] | Xiaojing Xu;Honghong Shao;Jianchang Gao;Kangmin Chen;Xiaonong Cheng.Effect of SiC film on tensile properties of nanostructured Ti produced by compressive deformation at liquid-nitrogen temperature[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,20081/2(1/2):195-201. |
| [10] | Y.H. Zhao;X.Z. Liao;Z. Jin.Micro structures and mechanical properties of ultrafine grained 7075 Al alloy processed by ECAP and their evolutions during annealing[J].Acta materialia,200415(15):4589-4599. |
| [11] | Cabibbo, M..Microstructure strengthening mechanisms in different equal channel angular pressed aluminum alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2013:413-432. |
| [12] | P. Luo;D.T. McDonald;W. Xu.A modified Hall-Petch relationship in ultrafine-grained titanium recycled from chips by equal channel angular pressing[J].Scripta materialia,201210(10):785-788. |
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