Microstructures and Mechanical Properties of Mg Alloy after Severe Torsion Straining Process

Abstract:

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Grain refinement is attempted using severe plastic deformation (SPD) through the severe torsion straining process (STSP) which we have developed recently. The STSP is a continuous process for grain refinement without requirement of any die. In this study, an AZ61 Mg alloy was subjected to STSP at a temperature of 573 K with a rotation speed of 10 rpm and a moving speed of 200 mm/min. With this process, an initial grain size of ~20 μm was reduced to ~2~3 μm. Room temperature compression tests revealed that there were no cracks after 15% of compression for the STSP sample whereas fracture occurred for a conventionally extruded sample. For compression tests at 473 K, no cracks occurred in the STSP samples after 80% compression but compression was feasible without cracking only up to 20% for an extruded sample. It is shown that the STSP can be useful for grain refinement and ductility improvement of the AZ61 Mg alloy.

Info:

Periodical:

Materials Science Forum (Volumes 503-504)

Edited by:

Zenji Horita

Pages:

949-954

DOI:

10.4028/www.scientific.net/MSF.503-504.949

Citation:

Y. Miyahara et al., "Microstructures and Mechanical Properties of Mg Alloy after Severe Torsion Straining Process", Materials Science Forum, Vols. 503-504, pp. 949-954, 2006

Online since:

January 2006

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Price:

$35.00

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