Mechanical and Tribological Properties of AA7075 Based MMC Processed through Ultrasound Assisted Casting Technique

Publication date: 2018Source: Materials Today: Proceedings, Volume 5, Issue 11, Part 3Author(s): Vinod Kumar V. Meti, Ramesh Konaraddi, I.G. SiddhalingeshwarAbstractAluminum alloy based metal matrix composites play an important role in the field of automobile, aerospace, military and structural applications due to their improved mechanical and tribological properties as compared to base aluminum alloys. To enhance the mechanical and tribological properties, suitable reinforcement particles are added in to the aluminum alloy to form a composite. In this investigation an attempt has been made to develop a composite (AA7075/5%TiB2) suitable for automobile and aerospace applications with improved mechanical and tribological properties through in-situ and ultrasound assisted in-situ processing techniques. Further, these composites have been subjected to hot forging. Hardness tests were carried out in order to study the mechanical properties of the composite. The test results showed that the addition of TiB2 particles improves the hardness. Micrographs reveal the uniform distribution of TiB2 particles surrounded along the grain boundaries and this leads to improved mechanical properties. Wear tests have been carried out using pin-on-disc tribo tester. Wear test results showed that the addition of TiB2 particles enhance the wear resistance of composite and co-efficient of friction decreases significantly by processing techniques such as in-situ and ultrasound. Superior grain refinem...
Source: Materials Today: Proceedings - Category: Materials Science Source Type: research