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|Title:||FRACTURE STUDIES OF UFG AL-ALLOYS|
|Keywords:||MECHANICAL INDUSTRIAL ENGINEERING;FRACTURE STUDIES;UFG AL-ALLOYS;ALUMINIUM ALLOYS|
|Abstract:||Aluminium alloys have been used continuously from many years because of their good properties such as low weight, formability, ductility and well established methods to work with them. All these properties favor the demand of current structural applications. Aluminium is being used in automobile industry mainly due to its added advantage of low weight, so that the components made from it can reduce the overall weight and hence, the overall reduction of operating cost of the vehicle. Similar is the case of aerospace industry where overall weight reduction will provide flexibility in carrying more payloads. In addition to low weight, the demand of high strength should also be met. One of the potential methods to combine these two properties is the grain refinement method. There are several grain refinement methods like cryorolling, equal channel angular pressing (ECAP), accumulative roll bonding (ARB), etc. Out of these methods, cryorolling is the best suited method for producing fine grains, and is capable of producing sheets at a good production rates. There are still many applications where high strength materials may fail below their normal strength. For example, components fail below their normal strength when they are subjected to repeated loading or their load bearing capacity may decrease if a crack is present in the material. Therefore, in the present work, an attempt has been made to increase the strength of Al-alloy by cryorolling process. For this work Al-6063 alloy which is a medium strength alloy, has been used. Cryorolling has been used for grain refinement, and the thickness of alloy has been reduced by 50% by this process. The mechanical properties of this cryorolled alloy such as its strength, % elongation and hardness are investigated. The fatigue behavior of this cryorolled alloy has been determined experimentally. Also a consideration is given to determine its resistance against crack propagation. For this purpose, fracture toughness testing has been done. In order to get an idea about the improvement in properties, the results obtained for this cryorolled alloy have been compared with the results of solution treated alloy.|
|Research Supervisor/ Guide:||Singh, Indra Vir|
Pathak, P. M.
|Appears in Collections:||MASTERS' DISSERTATIONS (MIED)|
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