Particle Redistribution and Grain Refinement during Processing by Hydrostatic Extrusion

Kinga Wawer; Małgorzata Lewandowska; Krzysztof Jan Kurzydlowski

doi:10.4028/www.scientific.net/MSF.584-586.541

Paper Titles

Life Time Predictions through X-Ray Defect Analysis of MEMS Devices
p.518

Effect of the Second Phase on the Microstructure of Magnesium Alloys during Cyclic Extrusion Compression
p.523

Grain Boundary Structure and Deformation Defects in Nanostructured Al–Mg Alloys Processed by High Pressure Torsion
p.528

Microstructure and Properties of Aluminium Processed by Constrained Groove Pressing
p.535

Particle Redistribution and Grain Refinement during Processing by Hydrostatic Extrusion
p.541

Microstructure and Mechanical Properties of Al-0.5 at.% X (=Si, Ag, Mg) Alloys Highly Deformed by ARB Process
p.547

High Pressure Torsion of Intermetallic Zr₃Al
p.553

Structure and Properties of Mg-Al-Ca Alloy after Severe Plastic Deformation
p.559

Microstructure and Texture of Mg-Based AZ Alloys after Heavy Deformation under Cyclic Strain Path Change Conditions
p.565

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Particle Redistribution and Grain Refinement during Processing by Hydrostatic Extrusion

Abstract:

In this study particle redistribution and grain size refinement induced by hydrostatic extrusion (HE) have been studied in two Al-Si cast alloys (Al-9%Si and Al-11%Si). It has been found that HE results in a significant changes in particle shape, size and distribution which was revealed by SEM observations and quantified using stereological parameters. At the same time, significant grain refinement down to ~100 nm in diameter takes place in aluminium phase. Such a microstructure evolution affects substantially the mechanical properties of two-phase alloys. The yield strength and tensile strength increase over two times whereas the plasticity only slightly decreases.