More than 70% of mechanical parts in a wide range of engineering fields fail by fatigue. In addition, centrifugal casting is identified as the most effective casting technique for production of high performance cylindrical parts. In this regard, the present work aims to investigate the fatigue behavior of series 3000 Al with addition of 26 wt% Cu produced through horizontal centrifugal casting method. Microstructure characterizations are precisely studied using scanning transmission electron microscopy and field emission scanning electron microscopy in conjunction with image analyzer software. Also, compressive behavior, hardness, coefficient of thermal expansion, and wear rate (Wr) are measured applying Zwick Z100, Vickers hardness, DIL 805A/D, and pin-on-disc machines, respectively. The results indicate that the main intermetallic compound is Al2Cu-based particle, and a volume fraction of 31 vol.% is obtained. Besides, the compressive strength of 460 MPa, elastic modulus of 10.986 GPa, hardness of 152 HV, coefficient of thermal expansion of 1.7 × 10−5 1/°C, and wear resistance of 3.3 × 10−6 g/mm2 are measured. Finally, the four-point bending fatigue test is performed and the fatigue ratio of 0.109 at about 106 cycles to failure is obtained.

中文翻译：

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添加 26 wt% Cu 的 3000 Al 系列离心疲劳行为研究

在广泛的工程领域中，超过 70% 的机械零件因疲劳而失效。此外，离心铸造被认为是生产高性能圆柱形零件的最有效的铸造技术。在这方面，目前的工作旨在研究通过水平离心铸造方法生产的添加 26 wt% Cu 的 3000 Al 系列的疲劳行为。使用扫描透射电子显微镜和场发射扫描电子显微镜结合图像分析仪软件来精确研究微观结构特征。此外，压缩行为、硬度、热膨胀系数和磨损率 (Wr) 分别使用 Zwick Z100、维氏硬度、DIL 805A/D 和销盘式机器进行测量。结果表明，主要金属间化合物为Al2Cu基颗粒，体积分数为31vol.%。此外，测得的抗压强度为460 MPa，弹性模量为10.986 GPa，硬度为152 HV，热膨胀系数为1.7×10-5 1/°C，耐磨性为3.3×10-6 g/mm2。最后进行四点弯曲疲劳试验，得到0.109左右的106次循环失效的疲劳比。