形变热处理对喷射成形Al-Cu-Li合金组织与力学性能的影响

唐启东 肖锎 官瑞春 江茫 徐进军

唐启东, 肖锎, 官瑞春, 江茫, 徐进军. 形变热处理对喷射成形Al-Cu-Li合金组织与力学性能的影响[J]. 航空材料学报, 2021, 41(6): 33-43. doi: 10.11868/j.issn.1005-5053.2021.000077
引用本文: 唐启东, 肖锎, 官瑞春, 江茫, 徐进军. 形变热处理对喷射成形Al-Cu-Li合金组织与力学性能的影响[J]. 航空材料学报, 2021, 41(6): 33-43. doi: 10.11868/j.issn.1005-5053.2021.000077
TANG Qidong, XIAO Kai, GUAN Ruichun, JIANG Mang, XU Jinjun. Microstructures and mechanical properties of spray deposited Al-Cu-Li alloy through thermo-mechanical processing[J]. Journal of Aeronautical Materials, 2021, 41(6): 33-43. doi: 10.11868/j.issn.1005-5053.2021.000077
Citation: TANG Qidong, XIAO Kai, GUAN Ruichun, JIANG Mang, XU Jinjun. Microstructures and mechanical properties of spray deposited Al-Cu-Li alloy through thermo-mechanical processing[J]. Journal of Aeronautical Materials, 2021, 41(6): 33-43. doi: 10.11868/j.issn.1005-5053.2021.000077

形变热处理对喷射成形Al-Cu-Li合金组织与力学性能的影响

doi: 10.11868/j.issn.1005-5053.2021.000077
基金项目: 湖南省自然科学基金科教联合项目(2020JJ7077)
详细信息
    作者简介:

    唐启东,男,硕士,讲师;研究方向为铝合金材料设计与检测,邮箱:450497079@qq.com

    通讯作者:

    徐进军(1986—),男,讲师;研究方向为铝合金材料设计与检测。E-mail:xujinjun1986@sohu.com

  • 中图分类号: TG146

Microstructures and mechanical properties of spray deposited Al-Cu-Li alloy through thermo-mechanical processing

  • 摘要: 采用一系列的微观组织观察与力学性能测试相结合的实验方法,研究喷射成形Al-Cu-Li合金在形变热处理过程中的微观组织演变以及力学性能。结果表明:喷射成形态铝锂合金中晶粒为典型的等轴晶;合金晶界处的粗大结晶相为Al7Cu2Fe相,晶粒内部细长的结晶相为AlCu相;经均匀化处理后,合金中晶界宽度减小且晶内元素分布趋于均匀;合金中只有少量呈块状的Al7Cu2Fe相和点状的AlCu相和AlZr相未溶解;固溶处理后合金晶粒组织仍然为等轴晶,且合金中有呈弥散分布的纳米级的第二相(β′相和δ′相)析出;与直接人工时效处理合金相比,时效前预变形处理能够加速时效进程,提高峰值时效态合金的力学性能;时效前预变形处理能够促进T1相在晶内致密析出,并抑制晶界粗大相和晶内δ′相的形成,有效地弱化了应力集中效应,并促进晶界、晶内变形更加均匀,能够在提升合金强度的同时提升合金韧性。

     

  • 图  1  喷射成形态铝锂合金金相照片 (a)低倍;(b)高倍

    Figure  1.  Optical microstructure photos of spray deposited alloy  (a) low magnification ; (b) high magnification

    图  2  喷射成形态合金 (a),(b)SEM照片;(c),(d)EDS测试结果

    Figure  2.  Spray deposited alloy (a), (b)SEM microstructure photos; (c), (d)EDS testing results

    图  3  喷射成形态合金的DSC测试结果

    Figure  3.  DSC testing results of spray deposited alloy

    图  4  经均匀化处理后合金的金相组织照片

    Figure  4.  Optical microstructure photos of spray deposited alloy after homogenization treatment

    图  5  经均匀化处理后合金 (a),(b)SEM ;(c),(d)EDS测试结果

    Figure  5.  Spray deposited alloy after homogenization treatment   (a), (b)SEM ; (c), (d)EDS testing results

    图  6  经固溶处理后合金的金相照片 (a)低倍;(b)高倍

    Figure  6.  Optical microstructure photos of alloy after solution treatment  (a) low magnification ;(b) high magnification

    图  7  经固溶处理后合金的TEM照片 

    Figure  7.  TEM images of alloy after solution treatment  (a) bright field;(b) dark field

    图  8  不同时效制度下合金的时效硬化曲线

    Figure  8.  Age hardening curves of alloys under different aging systems

    图  9  不同时效制度下合金的室温拉伸测试结果

    Figure  9.  Mechanical properties of alloys under different aging systems

    图  10  不同时效制度下合金的室温拉伸断口形貌图 (a),(b)AA试样;(c),(d)PA试样

    Figure  10.  Tensile fracture images of alloy under different aging systems  (a), (b) AA sample;(c), (d) PA sample

    图  11  经不同时效处理后AA合金在透射电镜下[110]Al方向下的TEM选区衍射谱以及STEM照片 (a),(b)AA试样;(c),(d)PA试样

    Figure  11.  STEM images in [110]Al direction and corresponding SAED patterns under different aging conditions of alloy (a), (b) AA sample; (c), (d) PA sample

    图  12  图11(b)中方形块状相的成分测试结果

    Figure  12.  Composition testing results of square massive phase in point 1 of Fig.11(b)

    图  13  合金中T1相的直径分布、平均直径以及数密度统计结果 (a)AA试样;(b)PA试样

    Figure  13.  Statistics results of diameter distribution, average diameter and number density of T1 precipitates of alloys  (a) AA sample; (b) PA sample

    图  14  经不同时效处理后合金在透射电镜下[110]Al方向下晶界的明场TEM照片 (a)AA试样;(b)PA试样

    Figure  14.  Bright field TEM images of grain boundaries in [110]Al direction under transmission electron microscopy after different aging treatment of alloy  (a) AA sample;(b) PA sample

    表  1  实验用Al-Cu-Li合金的化学成分(质量分数/%)

    Table  1.   Chemical composition of Al-Cu-Li alloy(mass fraction/%)

    CuLiMgAgZrFeSiAl
    3.901.180.470.310.130.0450.042Bal
    下载: 导出CSV
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  • 收稿日期:  2021-05-07
  • 修回日期:  2021-10-23
  • 刊出日期:  2021-12-01

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