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Fatigue life, distortion behavior of AA 8011- nano B4C composite using simulated acoustic emission technique – An experimental and statistical appraisal
International Journal of Fatigue ( IF 6 ) Pub Date : 2022-07-26 , DOI: 10.1016/j.ijfatigue.2022.107168
J. Arun , T.G. Ansalam Raj , K.E. Reby Roy , S. Suresh

The high quality AA8011 aluminium alloy dispersed with different percentages of nano-sized B4C (0, 0.5,1 and 1.5 wt%) was fabricated by electromagnetic frequency high energy stir casting technique. The characterization study on metal matrix nanocomposites (MMNC) using Field Emission Scanning Electron Microscope (FESEM), Energy Dispersive Spectrum (EDS), and X-ray Diffraction (XRD) confirmed the morphology and distribution of AA8011 with nano B4C. The microhardness analysis and strength using Vickers hardness testing and Electromechanical Universal Testing Machine, respectively, show significant mechanical properties improvement. The ductility study on Scanning Electron Microscope (SEM) images of the fractured samples reveal the transition from ductile to brittle nature in MMNCs. The online monitoring using Acoustic Emission (AE) during a tensile test indicates the mitigation in crack generation and its propagation. The substantial enhancement in fatigue life by the addition of nano B4C was evidenced by testing at a stress ratio (R = 0.1) and statistically significant (at p < 0.05) by one way Analysis of Variance (ANOVA). The SEM Fractography of fractured fatigue samples discloses the influence of dispersal of nano-sized reinforcements which resist fatigue crack growth. The result demonstrates that AA8011-1.5 % nano B4C composite has improved hardness, higher tensile strength and fatigue strength than the pure matrix due to the addition of the B4C.



中文翻译:

使用模拟声发射技术的 AA 8011-纳米 B4C 复合材料的疲劳寿命、变形行为——实验和统计评估

采用电磁频率高能搅拌铸造技术制备了分散不同比例纳米B 4 C(0、0.5、1和1.5 wt%)的高品质AA8011铝合金。使用场发射扫描电子显微镜 (FESEM)、能谱 (EDS) 和 X 射线衍射 (XRD) 对金属基质纳米复合材料 (MMNC) 进行的表征研究证实了具有纳米 B 4的 AA8011 的形态和分布C. 分别使用维氏硬度试验和机电万能试验机的显微硬度分析和强度,显示出显着的机械性能改善。断裂样品的扫描电子显微镜 (SEM) 图像的延展性研究揭示了 MMNCs 从延展性到脆性的转变。在拉伸试验期间使用声发射 (AE) 的在线监测表明裂纹产生及其扩展的缓解。通过添加纳米 B 4显着提高疲劳寿命通过单向方差分析 (ANOVA) 在应力比 (R = 0.1) 和统计显着性 (p < 0.05) 下测试证明了 C。断裂疲劳样品的 SEM 断口图揭示了抗疲劳裂纹扩展的纳米级增强材料分散的影响。结果表明,由于添加了B 4 C,AA8011-1.5 %纳米B 4 C复合材料的硬度、抗拉强度和疲劳强度均高于纯基体。

更新日期:2022-07-29
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