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Mechanical properties of Al–Si–SiC composites
| Content Provider | Scilit |
|---|---|
| Author | Tiwari, Saurabh Das, Sourav Ch, Venkat A. N. |
| Copyright Year | 2019 |
| Description | Journal: Materials Research Express This paper deals with cyclic stress properties of Al-Si (LM13) alloy and its 10wt.% SiC particle composite in the cast and T6 temper situations at room temperature. Fully inverse loading is applied to materials with stress amplitude maximum up to 50,000 cycles. Stress vs. No of cycle (S-N) curve is generated. Fatigue strength of artificially aged LM13 alloy increases as compared to cast alloy; however, dispersion of SiC particles deteriorates the fatigue life under the present domain of experiments. The mechanical properties such as ultimate tensile strength (UTS), offset yield strength (OYS) and elongation (% El) is found inferior for composites compared to the base alloy. Remarkable improvement in mechanical properties is observed in heat-treated alloy and composite. Scanning Electron Microscopic (SEM) examination of fatigue fractured surfaces of LM13 alloy depicts that interface decohesion is the predominant mechanism for failure in T6 tempered condition, whereas fracturing of eutectic silicon is major in cast condition. In (Al-Si)-SiC composites, cracks were initiated due to decohesion of the particle-matrix interface and in some instances breaking of the particles is also noticed. It is observed that heat treated eutectic silicon, which is nearly spherical in shape, resists fatigue crack growth because of better cohesive force with the Al matrix as compared to SiC particle and fewer sites for stress riser. Better bonding between eutectic silicon and Al matrix causes the crack to pass through the interface whereas Si particle endures fatigue load and ultimately, crack surpasses particle by fracturing it. |
| Related Links | https://iopscience.iop.org/article/10.1088/2053-1591/ab1521/pdf |
| ISSN | 20531591 |
| e-ISSN | 20531591 |
| DOI | 10.1088/2053-1591/ab1521 |
| Journal | Materials Research Express |
| Issue Number | 7 |
| Volume Number | 6 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2019-04-01 |
| Access Restriction | Open |
| Subject Keyword | Journal: Materials Research Express Mechanical Engineering Sic Particle Sic Composites T6 Temper Al Si |
| Content Type | Text |
| Resource Type | Article |
| Subject | Surfaces, Coatings and Films Metals and Alloys Biomaterials Electronic, Optical and Magnetic Materials Polymers and Plastics |
