Abstract
During machining of metals and alloys, a large amount of chips are generated. These chips are generally recycled by a re-melting technique and problems of relatively higher metal loss, toxic gas generation, greenhouse emission and relatively high-energy consumption are found during recycling. However, these problems can be minimized/eliminated if we use a solid-state recycling technique. Solid-state recycling is considered a more suitable choice, especially for scrap chips or turning and it can directly converts scraps into bulk products with superior mechanical properties, bypassing melting. This chapter discusses about the relevance, importance and advantages of solid-state recycling over liquid recycling of metals and alloy waste chips. It presents fabrication of metal matrix composites from waste metals/alloys chips by various solid-state recycling techniques like powder metallurgy, hot extrusion, equal channel angular processing (ECAP), friction stir processing and forging operations. This chapter highlights the basic principles of various solid-state recycling techniques and also reviews recent research on the preparation of metal matrix composites by using these solid-state recycling techniques. Finally, a summary is presented on the synthesis and properties of various metal matrix composites by using different solid-state recycling techniques.
Published Version
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