Keran Zdenka, Jakovljević Suzana, Runje Biserka, Ciganović Igor, Ćorić Danko
Department of Technology, Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lučića 5, 10000 Zagreb, Croatia.
Department of Materials, Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lučića 5, 10000 Zagreb, Croatia.
Materials (Basel). 2024 Aug 16;17(16):4070. doi: 10.3390/ma17164070.
Aluminium finds wide application in mechanical engineering due to its low density and corrosion resistance. In this research, aluminium was subjected to two different metal forming technologies-cold forging (upsetting) and equal channel angular pressing (ECAP)-to obtain improvement in its exploitation properties. Parallel to changing mechanical properties by using these two processes, there was a change in the microstructure of the material. The resulting microstructures were examined using an optical microscope. A different treated aluminium was subjected to erosion wear in various time intervals. Wear testing was conducted for two different impingement angles causing abrasive wear and impact wear. The erosion mechanisms were examined by scanning electron microscopy. These results showed that there is no statistically significant difference in erosion wear for different states at the same impingement angle. However, the difference is noticeable at different wear angles. The significance of the difference in wear of the samples treated with the forging and ECAP techniques was validated by statistical analysis with tests of different sensitivities. The results of the -test showed that ECAPed samples present a statistically significant difference in the loss of mass due to variations in erosion angle during the 30, 45, and 60 min wearing. A substantial difference in the change in sample mass is also visible for the forged state worn for 60 min.
由于铝的低密度和耐腐蚀性，它在机械工程中得到了广泛应用。在本研究中，对铝进行了两种不同的金属成型技术——冷锻（镦粗）和等径角挤压（ECAP），以改善其使用性能。在通过这两种工艺改变机械性能的同时，材料的微观结构也发生了变化。使用光学显微镜对所得微观结构进行了检查。对经过不同处理的铝在不同时间间隔进行了冲蚀磨损试验。针对两种不同的冲击角度进行了磨损测试，这两种角度会导致磨料磨损和冲击磨损。通过扫描电子显微镜检查了冲蚀机制。这些结果表明，在相同冲击角度下，不同状态的冲蚀磨损在统计学上没有显著差异。然而，在不同磨损角度下差异是明显的。通过具有不同灵敏度测试的统计分析，验证了采用锻造和ECAP技术处理的样品在磨损方面差异的显著性。t检验结果表明，在30分钟、45分钟和60分钟的磨损过程中，由于冲蚀角度的变化，经过ECAP处理的样品在质量损失方面存在统计学上的显著差异。对于锻造状态且磨损60分钟的样品，样品质量变化也存在显著差异。
