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20vol%体积分数纳米Al2O3颗粒增强铝基复合材料的高温压缩性能

李玄 赵科 刘金铃

李玄, 赵科, 刘金铃. 20vol%体积分数纳米Al2O3颗粒增强铝基复合材料的高温压缩性能[J]. 复合材料学报, 2023, 40(2): 1118-1128. doi: 10.13801/j.cnki.fhclxb.20220401.001
引用本文: 李玄, 赵科, 刘金铃. 20vol%体积分数纳米Al2O3颗粒增强铝基复合材料的高温压缩性能[J]. 复合材料学报, 2023, 40(2): 1118-1128. doi: 10.13801/j.cnki.fhclxb.20220401.001
LI Xuan, ZHAO Ke, LIU Jinling. High-temperature compressive properties of 20vol% volume fraction nano-Al2O3 particles reinforced aluminum matrix composite[J]. Acta Materiae Compositae Sinica, 2023, 40(2): 1118-1128. doi: 10.13801/j.cnki.fhclxb.20220401.001
Citation: LI Xuan, ZHAO Ke, LIU Jinling. High-temperature compressive properties of 20vol% volume fraction nano-Al2O3 particles reinforced aluminum matrix composite[J]. Acta Materiae Compositae Sinica, 2023, 40(2): 1118-1128. doi: 10.13801/j.cnki.fhclxb.20220401.001

20vol%体积分数纳米Al2O3颗粒增强铝基复合材料的高温压缩性能

doi: 10.13801/j.cnki.fhclxb.20220401.001
基金项目: 四川省重点研发项目(2020YFG0140)
详细信息
    通讯作者:

    赵科,博士,助理研究员,研究方向为轻质金属基复合材料的制备与力学性能 E-mail: zhaooke@163.com

  • 中图分类号: TB331

High-temperature compressive properties of 20vol% volume fraction nano-Al2O3 particles reinforced aluminum matrix composite

Funds: Key Research and Development Project in Sichuan Province (2020YFG0140)
  • 摘要: 为提高铝基材料的高温力学性能以满足其在573 K以上用于航空航天装备结构件的性能需求,采用高能球磨结合真空热压烧结工艺制备了体积分数高达20vol%的纳米Al2O3颗粒(146 nm)增强铝基复合材料,对其微观结构和高温压缩性能进行了研究。结果表明:纳米Al2O3颗粒均匀分散于超细晶铝基体中,且复合材料完全致密;该复合材料具有优异的高温压缩性能:应变速率为0.001/s时,473 K时压缩强度高达380 MPa,即使673 K时依然高达250 MPa,比其他传统铝基材料提高至少1倍;通过对其流变应力进行基于热激活的本构模型拟合可以发现,该复合材料具有高的应力指数(30)和表观激活能(204.02 kJ/mol)。这是由于高体积分数纳米颗粒能够有效钉扎晶界,并与铝基体形成热稳定的界面结合,显著提高复合材料的组织热稳定性,而且在变形过程中与晶界有效阻碍位错运动,显著提高复合材料的热变形门槛应力(在473~673 K时为190.6~328.4 MPa),其热变形过程可以由亚结构不变模型进行解释。

     

  • 图  1  20vol%纳米Al2O3/Al复合材料的烧结工艺

    Figure  1.  Sintering process of 20vol% nano-Al2O3/Al composite

    图  2  20vol%纳米Al2O3/Al复合材料的XRD图谱

    Figure  2.  XRD pattern of 20vol% nano-Al2O3/Al composite

    图  3  20vol%纳米Al2O3/Al复合材料不同倍数的SEM图像((a)、(b))和Al2O3颗粒粒径统计(c)

    Figure  3.  SEM images ((a), (b)) of 20vol% nano-Al2O3/Al composites and Al2O3 particle size statistics (c)

    图  4  20vol%纳米Al2O3/Al复合材料不同倍数的TEM图像和Al基体晶粒尺寸统计:(a)低倍TEM图像;(b) 铝基体晶粒尺寸统计;(c) 高倍TEM图像;(d) Al2O3颗粒/铝基体界面HRTEM图像

    Figure  4.  TEM images and Al grain size statistics of 20vol% nano-Al2O3/Al composites: (a) Low magnification TEM image; (b) Grain size statistics of the Al matrix; (c) High magnification TEM image; (d) High resolution TEM (HRTEM) image of Al2O3 particle/Al interface

    图  5  20vol%纳米Al2O3/Al复合材料不同温度和应变速率下高温压缩性能:(a)应变速率为0.1/s;(b)应变速率为0.01/s;(c)应变速率为0.001/s;(d)峰值应力对比

    Figure  5.  High temperature compressive properties of 20vol% nano-Al2O3/Al composites under different temperatures and strain rates conditions: (a) Strain rate of 0.1/s; (b) Strain rate of 0.01/s; (c) Strain rate of 0.001/s; (d) Comparison of peak stress

    图  6  20vol%纳米Al2O3/Al复合材料与传统铝基材料高温压缩性能对比

    NG—Nano grained; NT—Nanotwinned

    Figure  6.  Comparison of high temperature compressive properties between 20vol% nano-Al2O3/Al composites and traditional aluminum-based materials

    图  7  20vol%纳米Al2O3/Al复合材料流变应力方程拟合关系图

    Figure  7.  Fitting diagram of flow stress equations of 20vol% nano-Al2O3/Al composite

    $ \dot{\varepsilon } $—Strain rate; α—Material constant; σ—Stress; T—Temperature

    图  8  20vol%纳米Al2O3/Al复合材料lnZ-ln[sinh(ασ)]拟合图

    Figure  8.  Fitted curve between lnZ and ln[sinh(ασ)] of 20vol% nano-Al2O3/Al composite

    Z—Zener-Holloomon parameter

    图  9  20vol%纳米Al2O3/Al复合材料Lagneborg-Bergman图:(a) $ n{{'}} $=3;(b) $ n{{'}} $=5;(c) $ n{{'}} $=8

    Figure  9.  Lagneborg-Bergman diagram of 20vol% nano-Al2O3/Al composites: (a) $ n{{'}} $=3; (b) $ n{{'}} $=5; (c) $ n{{'}} $=8

    $ n{{'}} $—True stress exponent; G—Shear modulus

    图  10  20vol%纳米Al2O3/Al复合材料在673 K、0.001/s变形后的TEM图像(a)和铝基体晶粒尺寸统计图(b)

    Figure  10.  TEM images (a) and Al grain size statistics (b) of 20vol% nano-Al2O3/Al composites after deformation at 673 K and strain rate of 0.001/s

    图  11  20vol%纳米Al2O3/Al复合材料在673 K、0.001/s变形后的TEM图像和电子衍射分析结果:(a) TEM图像;(b)对应于图11(a)圆形区域的电子衍射图谱;((c)、(e)、(g))分别为对应于图11(a)圆形区域的Al2O3颗粒/铝基体界面、铝晶界和铝晶粒内部的高分辨TEM图像;((d)、(f)、(h))分别对应于图11(c)图11(e)图11(g)正方形区域的反傅里叶变换图

    Figure  11.  TEM images and analysis results based on electron diffraction of 20vol% nano-Al2O3/Al composites after deformation at 673 K and strain rate of 0.001/s: (a) TEM image; (b) Electron diffraction pattern corresponding to circular area in Fig.11(a); ((c), (e), (g)) HRTEM images of Al2O3/Al interface, Al grain boundary and Al grain interior, respectively, corresponding to square areas in Fig.11(a); ((d), (f), (h)) Inverse fourier transform images corresponding to square area in Fig.11(c), Fig.11(e) and Fig.11(g), respectively

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出版历程
  • 收稿日期:  2022-02-11
  • 修回日期:  2022-03-20
  • 录用日期:  2022-03-23
  • 网络出版日期:  2022-04-02
  • 刊出日期:  2023-02-15

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