Effect of iron and combined iron and beryllium additions on the fracture toughness and microstructures of squeeze-cast Al-7Si-0.3Mg alloy |
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Authors: | S Murali A Trivedi K S Shamanna K S S Murthy |
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Affiliation: | (1) Mechanical Engineering Department, Indian Institute of Science, 560 012 Bangalore, India |
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Abstract: | Squeeze casting is a near-net-shape process of casting under pressure that yields a fine-grain structure with higher density
and mechanical properties compared to conventional casting processes. Iron is the most commonly present impurity element in
Al-7Si-0.3Mg, the alloy investigated. An increase in iron content significantly decreases fracture toughness. However, trace
additions of beryllium completely neutralize the detrimental effect of iron. The variables of the squeeze casting process
greatly govern the microstructures and macrostructures and thus the defects in the casting. This case study deals with Al7Si-0.3Mg
squeeze-cast cranks with four major defects—blistering, debonding, porosity, and patches of silicon segregation on the casting
surface—and the appropriate remedial measures to eliminate these defects. |
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Keywords: | aluminum alloys beryllium iron squeeze casting |
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