Effect of iron and combined iron and beryllium additions on the fracture toughness and microstructures of squeeze-cast Al-7Si-0.3Mg alloy

Journal Article · Thu Aug 01 04:00:00 EDT 1996 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/BF02648843· OSTI ID:367278

Murali, S; Trivedi, A; Shamanna, K S; Murthy, K S.S. ^[1]

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1. Indian Inst. of Science, Bangalore (India). Mechanical Engineering Dept.

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 Al-7Si-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.

• Sponsoring Organization: USDOE
• OSTI ID: 367278
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 4 Vol. 5; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AEROSPACE INDUSTRY
ALUMINIUM BASE ALLOYS
AUTOMOBILES
BERYLLIUM
BLISTERS
CASTING
DEFECTS
FRACTURE PROPERTIES
IRON
LIQUID METALS
MAGNESIUM ADDITIONS
METALLURGICAL EFFECTS
MICROSTRUCTURE
NATIONAL DEFENSE
POROSITY
PRESSURE DEPENDENCE
SEGREGATION
SILICON ALLOYS
TEMPERATURE DEPENDENCE
TIME DEPENDENCE