7085-T651铝合金特厚板组织性能的不均匀性

李承波 何克准 宋丰轩 刘胜胆 曹盛强 张新明

李承波, 何克准, 宋丰轩, 刘胜胆, 曹盛强, 张新明. 7085-T651铝合金特厚板组织性能的不均匀性[J]. 航空材料学报, 2016, 36(6): 15-22. doi: 10.11868/j.issn.1005-5053.2016.6.003
引用本文: 李承波, 何克准, 宋丰轩, 刘胜胆, 曹盛强, 张新明. 7085-T651铝合金特厚板组织性能的不均匀性[J]. 航空材料学报, 2016, 36(6): 15-22. doi: 10.11868/j.issn.1005-5053.2016.6.003
Chengbo LI, Kezhun HE, Fengxuan SONG, Shengdan LIU, Shengqiang CAO, Xinming ZHANG. Inhomogeneity of Microstructure and Properties of 7085-T651 Aluminum Alloy Extra-thick Plate[J]. Journal of Aeronautical Materials, 2016, 36(6): 15-22. doi: 10.11868/j.issn.1005-5053.2016.6.003
Citation: Chengbo LI, Kezhun HE, Fengxuan SONG, Shengdan LIU, Shengqiang CAO, Xinming ZHANG. Inhomogeneity of Microstructure and Properties of 7085-T651 Aluminum Alloy Extra-thick Plate[J]. Journal of Aeronautical Materials, 2016, 36(6): 15-22. doi: 10.11868/j.issn.1005-5053.2016.6.003

7085-T651铝合金特厚板组织性能的不均匀性

doi: 10.11868/j.issn.1005-5053.2016.6.003
基金项目: 

国家国际科技合作专项项目 2014DFA50210

国家重点基础研究计划项目 2012CB619501

详细信息
    通讯作者:

    李承波(1987-),男,博士,主要从事高性能轻合金材料研究,(E-mail)csulicb@qq.com

  • 中图分类号: TG146.21

Inhomogeneity of Microstructure and Properties of 7085-T651 Aluminum Alloy Extra-thick Plate

  • 摘要: 采用拉伸实验、剥落腐蚀实验、显微组织、化学成分、扫描电镜以及透射电镜和差示扫描量热法分析等手段,研究7085-T651铝合金特厚板组织性能的不均匀性。结果表明:110 mm厚7085-T651特厚板不同厚度层显微组织、力学性能和剥落腐蚀性能存在明显的不均匀性;1/4厚度层抗拉强度最低,为540 MPa,抗剥落腐蚀性能最差,腐蚀等级为EB级;心层抗拉强度最高,为580 MPa;表层抗剥落腐蚀性能最好,腐蚀等级为EA级;1/4层再结晶分数最多,约为47.7%,尺寸较大,约为105 μm,晶界及晶内均有平衡相析出,时效析出相尺寸较小,因而力学性能及抗剥落腐蚀性能均最差;中心层再结晶分数最少,约为14.8%,存在大量亚晶,残余的Al7Cu2Fe相最多,约为1.43%,晶界平衡相尺寸、时效析出相尺寸及PFZ宽度均较大,因而力学性能较好而抗剥落腐蚀性能较差。

     

  • 图  1  7085-T651特厚板不同层拉伸性能

    Figure  1.  Tensile properties at different layers of 7085-T651 aluminum alloy extra-thick plate

    图  2  7085-T651特厚板不同层断口SEM照片

    Figure  2.  SEM images at different layers of 7085-T651 aluminum alloy extra-thick plate (a),(b) surface;(c),(d)1/4 layer ;(e),(f) center

    图  3  7085-T651特厚板表层(1) ,1/4层(2) 和中心层(3) 剥落腐蚀形貌 (a) 12h;(b) 48 h

    Figure  3.  Corrosion morphologies of 7085-T651 aluminum alloy extra-thick plate at surface(1) ,1/4 layer(2) and center(3) (a) 12h;(b) 48 h

    图  4  7085-T651特厚板不同层的金相照片 (a)表面;(b)1/4层;(c),(d)中心

    Figure  4.  Metallographs at different layers of 7085-T651 aluminum alloy extra-thick plate (a) surface;(b) 1/4 layer;(c),(d) center

    图  5  7085-T651特厚板不同层SEM照片 (a)表面;(b)1/4层;(c),(d)中心

    Figure  5.  SEM images at different layers of 7085-T651 aluminum alloy extra-thick plate (a)surface;(b)1/4 layer;(c),(d)center

    图  6  7085-T651特厚板不同层TEM照片 (a),(b)表层;(c),(d)1/4层;(e),(f)中心层

    Figure  6.  TEM images at different layers of 7085-T651 aluminum alloy extra-thick plate (a),(b) surface;(c),(d) 1/4 layer;(e),(f) center

    图  7  7085-T651特厚板不同层的 DSC曲线及处理结果

    Figure  7.  DSC curves(a) and results(b) at different layers of 7085-T651 aluminum alloy extra-thick plate

    表  1  不同厚度层的化学成分(质量分数/%)

    Table  1.   Chemical composition of different thickness layers (mass fraction/%)

    LayerZnMgCuFeSiZrTiAl
    Surface7.061.521.710.03260.00760.1110.0346Bal.
    1/4 layer7.081.531.740.03350.00800.1090.0336Bal.
    Center7.121.561.770.03190.00770.1110.0370Bal.
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  • 收稿日期:  2016-03-14
  • 修回日期:  2016-04-15
  • 刊出日期:  2016-12-01

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