Mechanical properties and fatigue behavior of vacuum-assist die cast AlMgSiMn alloy

Aluminum die castings are often used as non-structural parts of automobile, in order to apply aluminum die castings as high-duty structural components, the fatigue behavior and mechanical properties of die casting (DC) and vacuum die casting (VDC) Al–Mg–Si–Mn samples are studied. Results indicate th...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2013-08, Vol.576, p.252-258
Main Authors: Wan, Li, Hu, Zuqi, Wu, Shusen, Liu, Xueqiang
Format: Article
Language:English
Subjects:
Aluminum alloy
Aluminum base alloys
Applied sciences
Automobile
Automotive components
Condensed matter: structure, mechanical and thermal properties
Crack growth rate
Cross-disciplinary physics: materials science
rheology
Die casting
Direct current
Elasticity and anelasticity
Elasticity, elastic constants
Exact sciences and technology
Fatigue
Fatigue (materials)
Fatigue failure
Fatigue life
Fractography
Fractures
Materials science
Mechanical and acoustical properties of condensed matter
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Mechanical properties of solids
Metals. Metallurgy
Physics
Treatment of materials and its effects on microstructure and properties
Vacuum die-casting
Weight reduction
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Summary:Aluminum die castings are often used as non-structural parts of automobile, in order to apply aluminum die castings as high-duty structural components, the fatigue behavior and mechanical properties of die casting (DC) and vacuum die casting (VDC) Al–Mg–Si–Mn samples are studied. Results indicate that ultimate tensile strength, yield strength and elongation of VDC samples (331MPa, 210MPa and 4.4% respectively) are superior to those of DC samples (321MPa, 205MPa and 3.9% respectively). Fatigue lives of the VDC and DC samples are similar to each other, while the fatigue life of the VDC samples is less scattered than those of DC samples. Slope of da/dN–ΔK curve of the VDC samples (2.824) is slightly smaller than that of DC samples (3.692). Vacuum assistance improves the fatigue resistance and the detrimental effect of Fe-bearing particles is eliminated. In addition, porosity, oxide inclusion and ductile deformation are responsible for the crack initiation and transgranular fracture is the dominant crack propagation mechanism.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2013.03.042