Paper Titles
Microstructural Aspects by Electron Microscopy Observed in Al-Mg Based Alloys after Special P/M Processes
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Microsegregation Effect of Copper in Solidification of A356 Alloy
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Control of the Alloying Element Distribution in Al-Alloys by High Magnetic Fields
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The Influence of 0.1% Sc Addition on the Microstructure and Texture Development in Al-Zn-Mg-Cu-Zr Alloys
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Substructures and Fatigue Crack Growth in HIPing and Semi-Liquid Die Casting A356 Alloys
p.469
Behavior Analysis of Environmental Hydrogen in High-Magnesium Al-Mg Alloys by Hydrogen Microprint Technique
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Effect of Mn Addition on the Mechanical Properties in Al-Cu-Li-Mg-Ag-Zr Alloys
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Structure and Properties of AlMg3 Alloy with Sc and Zr
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Structure Development during ECAP and Subsequent Creep of Aluminium
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Substructures and Fatigue Crack Growth in HIPing and Semi-Liquid Die Casting A356 Alloys

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Abstract:

Permanent mold and semi-liquid die A356 cast alloys were used to examine the roles of microstructures and aging conditions on fatigue crack growth. HIP treatment to the A356 alloy generates substructure like dendritic arm boundaries as well as reduction of pores, which improves fracture elongation and fatigue fracture toughness. The similar substructure occur at primary α-Al and inter Si particles of semi-liquid die cast, too. Fracture elongation of HIPed permanent mold cast is comparable to that semi-liquid die cast, the fatigue crack growth is faster than in semi-liquid die cast. Plastic hardening occurs around fatigue crack flank, which decreases fatigue crack growth rate, and such effect appears highly in under aged alloy.

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Periodical:

Materials Science Forum (Volumes 539-543)

Pages:

469-474

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.539-543.469

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Online since:

March 2007

Authors:

Sang Won Han, Hyuck Mo Lee

Keywords:

Casting, Fatigue Crack Growth (FCG), Inter-Cell Boundaries, Trans-Cell Boundaries, Work-Hardening

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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