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原位自生TiB2/7050铝基复合材料高周疲劳特性

段敏鸽 李晨 李彪 李亚智

段敏鸽, 李晨, 李彪, 等. 原位自生TiB2/7050铝基复合材料高周疲劳特性[J]. 复合材料学报, 2023, 40(11): 6430-6438. doi: 10.13801/j.cnki.fhclxb.20230112.001
引用本文: 段敏鸽, 李晨, 李彪, 等. 原位自生TiB2/7050铝基复合材料高周疲劳特性[J]. 复合材料学报, 2023, 40(11): 6430-6438. doi: 10.13801/j.cnki.fhclxb.20230112.001
DUAN Minge, LI Chen, LI Biao, et al. Study on the high cycle fatigue properties of in-situ TiB2/7050 composite[J]. Acta Materiae Compositae Sinica, 2023, 40(11): 6430-6438. doi: 10.13801/j.cnki.fhclxb.20230112.001
Citation: DUAN Minge, LI Chen, LI Biao, et al. Study on the high cycle fatigue properties of in-situ TiB2/7050 composite[J]. Acta Materiae Compositae Sinica, 2023, 40(11): 6430-6438. doi: 10.13801/j.cnki.fhclxb.20230112.001

原位自生TiB2/7050铝基复合材料高周疲劳特性

doi: 10.13801/j.cnki.fhclxb.20230112.001
基金项目: 国家科技重大专项(J2019-I-0016-0015);中国航空发动机集团产学研合作项目(HFZL2019 CXY015)
详细信息
    通讯作者:

    李亚智,博士,教授,博士生导师,研究方向为复合材料及其结构力学性能、结构疲劳与断裂、飞机结构耐久性/损伤容限E-mail: yazhi.li@nwpu.edu.cn

  • 中图分类号: TB331

Study on the high cycle fatigue properties of in-situ TiB2/7050 composite

Funds: National Science and Technology Major Project (J2019-I-0016-0015); Aero Engine Corporation of China Industry-University-Research Cooperation Project (HFZL2019 CXY015)
  • 摘要: 原位自生TiB2/Al复合材料是一类新型铝基复合材料,结合了陶瓷材料高硬度、耐高温、耐腐蚀等和铝合金材料良好的韧性和塑性加工特性等的性能特点,具有高比强度、高比刚度、广泛的合金基体选择范围、原材料成本低、制造和热处理工艺多样化等优势。然而,目前原位自生TiB2/Al复合材料的疲劳研究多侧重于微观机制研究,疲劳特性鲜有涉及应力比和缺口敏感性的讨论。以体积分数为3.67vol%的原位自生TiB2颗粒增强7050铝基复合材料(in-situ TiB2/7050-Al)为研究对象,开展了其高周疲劳特性试验研究,并与不含颗粒的7050铝合金进行对比。试验结果表明:在相同的疲劳载荷下,in-situ TiB2/7050-Al的疲劳强度明显大于7050铝合金;应力比为0.1和0.5时,该复合材料的疲劳极限较7050铝合金分别提高了24.59%和13.56%。进行了不同应力集中系数下的疲劳寿命对比,结果表明颗粒引入后一定程度上限制了复合材料基体的塑性变形,提高了其缺口敏感性。尽管如此,in-situ TiB2/7050-Al在存在缺口情况下的疲劳寿命仍高于7050铝合金。in-situ TiB2/7050-Al作为一种新型轻量化结构材料,有望代替传统铝合金,实现结构静强度和疲劳性能的共同提升。

     

  • 图  1  高周疲劳试样形状及尺寸

    $\phi $—Diameter; R—Radius

    Figure  1.  Geometry of high cycle fatigue specimen

    图  2  环槽缺口试件形式和尺寸:(a) V型缺口;(b) 圆弧缺口

    Figure  2.  Geometry of notched specimens: (a) V-type notch; (b) Arc notch

    图  3  环槽缺口试样最小截面沿径向由中心至缺口应力分布变化

    Figure  3.  Tensile stress distributions of notched bar specimens from center to notch edge of the minimum section

    图  4  高周疲劳典型断口形貌,疲劳裂纹萌生位置: (a) in-situ TiB2/7050-Al近表面夹杂处;(b) in-situ TiB2/7050-Al 表面处;(c) 7050-Al 表面处

    Figure  4.  Typical high cycle fatigue fractography of cracks initiation sites: (a) From near surface for in-situ TiB2/7050-Al; (b) Surface for in-situ TiB2/7050-Al; (c) Surface for 7050-Al

    图  5  in-situ TiB2/7050-Al近表面夹杂疲劳裂纹源扫描电镜图像: (a) 二次电子模式;(b) 背散模式;(c) 图5(b)中箭头所示部位EDS元素分析

    Figure  5.  SEM images of a fatigue crack initiated from a near-surface inclusion in the in-situ TiB2/7050-Al: (a) Secondary electron mode; (b) Backscattered electron mode; (c) EDS element analysis of the site in Fig.5(b) pointed by arrow

    图  6  in-situ TiB2/7050-Al高周疲劳(HCF)断口疲劳辉纹

    Figure  6.  Typical fatigue striation of in-situ TiB2/7050-Al in high-cycle fatigue (HCF) fracture surface

    图  7  in-situ TiB2/7050-Al和7050-Al的S-N曲线对比

    Figure  7.  Comparison of S-N curves for in-situ TiB2/7050-Al and 7050-Al

    图  8  不同应力比下S-N曲线对比

    Figure  8.  S-N curves comparison of different stress ratio

    图  9  缺口试样NRB-R3的典型疲劳断口(裂纹从表面起始):(a) in-situ TiB2/7050-Al;(b) 7050-Al

    Figure  9.  Typical fatigue fractography of NRB-R3 specimens (Initiated from surfaces): (a) in-situ TiB2/7050-Al; (b) 7050-Al

    图  10  不同应力集中系数下S-N曲线对比

    Figure  10.  S-N curves comparison at different stress concentration

    表  1  原位自生TiB2颗粒增强7050铝基复合材料(in-situ TiB2/7050-Al)和7050-Al拉伸性能

    Table  1.   Tensile properties of in-situ TiB2 particle reinforced 7050 aluminum alloy composite (in-situ TiB2/7050-Al) and 7050-Al

    MaterialE/GPaσy/MPaσb/MPaδ/%
    in-situ TiB2/7050-Al73.21657.53719.75 6.35
    7050-Al70.27500.43593.4810.93
    Notes: E—Elastic modulus; σy—Yield strength; σb—Ultimate strength; δ—Elongation.
    下载: 导出CSV

    表  2  环槽缺口圆棒试样分组信息

    Table  2.   Sets of the notched round bar specimens

    SpecimenR/mmD/mmKt
    NRB-R0.20.262.53
    NRB-R11.061.77
    NRB-R33.061.37
    Notes: NRB—Notched round bar; D—Diameter of minimum section; Kt—Stress concentration factor.
    下载: 导出CSV

    表  3  两种材料成组法疲劳试验结果分析(Rs=0.1)

    Table  3.   Statistics results of fatigue life for two materials by grouping method (Rs=0.1)

    Material${\sigma _{{\text{max}}}}$/MPaNet$\overline N $/cycleSCov/%
    in-situ TiB2/
    7050-Al
    530 4 19376 0.134 3.12
    500 4 34545 0.081 1.79
    470 5 40440 0.107 2.32
    440 4 95806 0.154 3.09
    7050-Al 400 3 23543 0.058 1.33
    370 6 98418 0.195 3.92
    340 4 175461 0.099 1.89
    320 3 1742584 0.133 2.14
    Notes: Rs—Stress ratio; Net—Number of effective specimens; $\overline N $—Logrithimic mean life; S—Standard deviation; Cov—Dispersion coefficients; σmax—Maximum level of a stress cycle.
    下载: 导出CSV

    表  4  两种材料成组法疲劳试验结果分析(Rs=0.5)

    Table  4.   Statistics results of fatigue life for two materials by grouping method (Rs=0.5)

    Material${\sigma _{{\text{max}}}}$/MPaNet$\overline N $/cycleSCov/%
    in-situ TiB2/
    7050-Al
    530 3 43931 0.040 0.86
    500 3 88728 0.058 1.18
    470 5 100643 0.159 3.17
    450 3 4075838 0.111 1.68
    7050-Al 500 4 34343 0.054 1.18
    450 3 62569 0.088 1.84
    430 3 94361 0.096 1.93
    410 3 795591 0.060 1.02
    下载: 导出CSV

    表  5  升降法疲劳极限结果分析

    Table  5.   Fatigue limit obtained by up-down method

    MaterialRsNepσf/MPaS/MPaCov/%
    in-situ TiB2/7050-Al0.16380.0010.952.88
    0.56446.6716.333.66
    7050-Al0.14305.0010.003.28
    0.56393.33 7.531.91
    Notes: Nep—Number of effective matched pairs; σf—Fatigue limit.
    下载: 导出CSV

    表  6  in-situ TiB2/7050-Al和7050-Al的疲劳强度-寿命(S-N)曲线参数

    Table  6.   Equation parameters of the fitted fatigue strength-life (S-N) curves of in-situ TiB2/7050-Al and 7050-Al

    MaterialRsabc
    in-situ TiB2/7050-Al0.1380.284.6306×10−6−0.13448
    0.5446.431.0202×10−5−0.17071
    7050-Al0.1309.131.0565×10−6−0.06955
    0.5401.791.5637×10−5−0.24802
    Notes: a, b, c—Parameters in Equation (1).
    下载: 导出CSV

    表  7  成组法环槽缺口圆棒疲劳试验结果分析(Rs=0.1)

    Table  7.   Statistics analysis of fatigue life from notched round bar specimens by grouping method (Rs=0.1)

    MaterialKt$\mathop {\sigma }\nolimits_{{\text{net}}}^{{\text{max}}} $/MPaNet$\overline N $/cycleSCov
    /%
    in-situ
    TiB2/
    7050-Al
    1.37 340 4 73292 0.124 2.87
    360 3 43990 0.087 1.88
    380 4 22079 0.152 3.13
    1.77 220 4 29680 0.088 2.33
    260 4 17564 0.105 2.47
    320 3 5820 0.030 0.68
    2.53 120 4 128424 0.132 2.90
    160 4 34241 0.138 2.70
    7050-Al 1.37 320 8 31409 0.242 5.38
    360 3 25044 0.087 1.98
    400 4 9902 0.116 2.90
    1.77 220 3 32184 0.043 1.07
    280 3 9793 0.039 0.87
    2.53 120 3 74996 0.026 0.58
    170 3 34097 0.090 1.84
    Note: $\mathop {\sigma }\nolimits_{{\text{net}}}^{{\text{max}}} $—Maximum net section stress of a stress cycle.
    下载: 导出CSV
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  • 收稿日期:  2022-11-17
  • 修回日期:  2022-12-16
  • 录用日期:  2022-12-17
  • 网络出版日期:  2023-01-12
  • 刊出日期:  2023-11-01

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