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TiB2/Al-Cu-Li复合材料时效析出及组织演变对力学性能的影响

张虎 刘福源 郭恩宇 陈宗宁 康慧君 王同敏

张虎, 刘福源, 郭恩宇, 等. TiB2/Al-Cu-Li复合材料时效析出及组织演变对力学性能的影响[J]. 复合材料学报, 2023, 40(12): 6819-6829. doi: 10.13801/j.cnki.fhclxb.20230327.001
引用本文: 张虎, 刘福源, 郭恩宇, 等. TiB2/Al-Cu-Li复合材料时效析出及组织演变对力学性能的影响[J]. 复合材料学报, 2023, 40(12): 6819-6829. doi: 10.13801/j.cnki.fhclxb.20230327.001
ZHANG Hu, LIU Fuyuan, GUO Enyu, et al. Effects of aging precipitation and microstructure evolution on mechanical properties of TiB2/Al-Cu-Li composites[J]. Acta Materiae Compositae Sinica, 2023, 40(12): 6819-6829. doi: 10.13801/j.cnki.fhclxb.20230327.001
Citation: ZHANG Hu, LIU Fuyuan, GUO Enyu, et al. Effects of aging precipitation and microstructure evolution on mechanical properties of TiB2/Al-Cu-Li composites[J]. Acta Materiae Compositae Sinica, 2023, 40(12): 6819-6829. doi: 10.13801/j.cnki.fhclxb.20230327.001

TiB2/Al-Cu-Li复合材料时效析出及组织演变对力学性能的影响

doi: 10.13801/j.cnki.fhclxb.20230327.001
基金项目: 国家自然科学基金(52022017;U22A20174;51974058;51927801)
详细信息
    通讯作者:

    郭恩宇,博士,教授,博士生导师,研究方向为镁、铝合金及其复合材料、金属凝固、4D材料科学 E-mail: eyguo@dlut.edu.cn

  • 中图分类号: TB331

Effects of aging precipitation and microstructure evolution on mechanical properties of TiB2/Al-Cu-Li composites

Funds: National Natural Science Foundation of China (52022017; U22A20174; 51974058; 51927801)
  • 摘要: 研究了TiB2/Al-Cu-Li复合材料T6工艺的微观组织演变和时效析出对力学性能的影响。通过气氛保护熔炼法制备了TiB2/Al-Cu-Li复合材料。结果表明:在铸态合金的微观组织中,TiB2颗粒和共晶相主要分布在晶界周围。均匀化处理后,大部分共晶相回溶。轧制变形后,TiB2颗粒沿着轧制方向被拉长,产生了大量位错。固溶处理削弱了轧制产生的Brass织构和S织构,回溶了轧制产生的析出相。在175℃温度下进行时效,欠时效过程中,δ'(Al3Li)/β'(Al3Zr)为主要析出相。随着时效时间的增加,到22 h峰时效时,T1相为主要析出强化相。通过位错强化和析出强化的共同作用,随时效时间增加,屈服强度和抗拉强度先上升后下降,延伸率持续下降。复合材料峰时效的极限抗拉强度为562.7 MPa,屈服强度为475.9 MPa,延伸率为4.5%。

     

  • 图  1  TiB2/Al-Cu-Li复合材料微观组织及相分布:(a) 铸态组织背散射电子(BSE)图像;(b) 均匀态组织SEM图像;((c), (d)) 图1(a)和图1(b)中高倍BSE微观组织和相应的EDS元素分析

    Figure  1.  Microstructure and phase distribution of TiB2/Al-Cu-Li composites: (a) Backscattered electron (BSE) image of as-cast structure; (b) SEM image of homogeneous structure; ((c), (d)) High magnification BSE microstructure and corresponding EDS elements analysis in Fig.1(a) and Fig.1(b)

    图  2  TiB2/Al-Cu-Li复合材料微观组织及相分布:(a) 热轧态组织BSE图像;(b) 固溶态组织BSE图像;((c), (d)) 图2(a)和图2(b)中高倍BSE微观组织和EDS元素分析

    Figure  2.  Microstructure and phase distribution of TiB2/Al-Cu-Li composites: (a) BSE image of hot-rolled state; (b) BSE image of solid solution state; ((c), (d)) High magnification BSE microstructure and EDS elements analysis in Fig.2(a) and Fig.2(b)

    ND—Normal direction; RD—Rolling direction

    图  3  TiB2/Al-Cu-Li复合材料电子背向散射衍射(EBSD)晶粒取向分布反极图(IPF)和晶粒尺寸统计:((a), (c)) 热轧态;((b), (d)) 固溶态

    Figure  3.  Electron backscatter diffraction (EBSD) grain orientation distribution inverse pole figure (IPF) and grain size statistics of TiB2/Al-Cu-Li composites: ((a), (c)) Hot rolled state; ((b), (d)) Solid solution state

    d—Diameter

    图  4  TiB2/Al-Cu-Li复合材料EBSD变形组织分布图和取向分布函数(ODF)图:((a)~(c)) 热轧态;((d)~(f)) 固溶态

    Figure  4.  EBSD deformation microstructure distribution and orientation distribution function (ODF) maps of TiB2/Al-Cu-Li composites: ((a)-(c)) Hot rolled state; ((d)-(f)) Solid solution state

    φ1, φ, φ2—Euler angle

    图  5  TiB2/Al-Cu-Li复合材料不同时效时间的拉伸性能

    Figure  5.  Tensile properties of TiB2/Al-Cu-Li composites with different aging times

    UTS—Ultimate tensile strength; YS—Yield strength; EL—Elongation

    图  6  TiB2/Al-Cu-Li复合材料TEM图像:(a) 8 h欠时效;(b) 22 h峰时效;(c) 峰时效T1相的HRTEM图像(图6(c1)为图6(c)的快速傅里叶变化(FFT)图像);(d) 图6(c)中T1相附近的位错的反傅里叶变化

    Figure  6.  TEM images of TiB2/Al-Cu-Li composites: (a) Under-ageing at 8 h; (b) Peak-ageing at 22 h; (c) HRTEM image of the peak-aged T1 phase (Fig.6(c1) is fast Fourier transform (FFT) image of Fig.6(c)); (d) Inverse Fourier filtered of the dislocations near the T1 phase in Fig.6(c)

    图  7  TiB2/Al-Cu-Li复合材料不同时效析出时间段屈服强度增长分数

    Figure  7.  Yield strength increase fraction of TiB2/Al-Cu-Li composites at different aging precipitation times

    表  1  TiB2/Al-Cu-Li复合材料的化学成分

    Table  1.   Chemical composition of TiB2/Al-Cu-Li composites

    Element Content/wt%
    Li 1.32
    Cu 4.43
    Mg 0.39
    Mn 0.23
    Ag 0.39
    Zn 0.27
    Ti 1.35
    B 0.57
    Zr 0.02
    Al Bal
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  • 收稿日期:  2023-02-02
  • 修回日期:  2023-03-07
  • 录用日期:  2023-03-19
  • 网络出版日期:  2023-03-28
  • 刊出日期:  2023-12-01

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