Studying on the fatigue behavior of Al- Al2O3 metal matrix nano composites processed through powder metallurgy | ||
| Journal of Ultrafine Grained and Nanostructured Materials | ||
| مقاله 10، دوره 52، شماره 2، اسفند 2019، صفحه 210-217 اصل مقاله (1016.09 K) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22059/JUFGNSM.2019.02.10 | ||
| نویسندگان | ||
| Majid Vaghari1؛ Gholam Reza Khayati* 2؛ S.A. Jenabali Jahromi1 | ||
| 1Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz, Iran. | ||
| 2Department of Materials Science and Engineering, Shahid Bahonar University of Kerman, Kerman, Iran. | ||
| چکیده | ||
| Excellent mechanical properties and fatigue performance of Al/Al2O3 metal-based nanocomposites caused to introduce this material as a good candidate for various applications. In this regard, the preparation and characterization of this composite can be considered as a hot issue for research. The study was carried out in several steps including: (i) preparation of Al/Al2O3 metal-based nanocomposites at various Al2O3 content as reinforcement (4, 6 and 8 wt.%) using wet attrition milling; (ii) hot forward extrusion process of prepared samples; (iii) determination of mechanical properties of prepared composite by tensile test; (iv) usage of rotating-bending fatigue test for determination of the fatigue performance of prepared composite and (v) analysis of the fracture surfaces of fatigue tests specimens to determine the mechanism/s of failure based on scanning electron microscope analysis. The results showed that the presence of Al2O3 nanoparticles up to 6 wt.% enhanced the fatigue strength of Al/Al2O3 nanocompositeswhile the higher amount of reinforcement has a detrimental effect on the fatigue strength. Also, the statistical nature of fatigue data confirmed the higher coherency as well as homogeneity of prepared composites by 6 wt.% of reinforcement. The EDX spectrum confirmed the presence of Al2O3 at the origin of crack. As a consequence, the most probable mechanisms for crack initiation through the cyclic loading can be considered as the fracture and/or detachment of reinforcement particles. | ||
| کلیدواژهها | ||
| Aluminum؛ Nanocomposite؛ Powder metallurgy؛ Extrusion؛ Fatigue strength | ||
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