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HomeMaterials Science ForumMaterials Science Forum Vols. 706-709Developing Hardness and Microstructural...

Developing Hardness and Microstructural Homogeneity in High-Pressure Torsion

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Abstract:

High-pressure torsion (HPT) is a processing technique in which samples, in the form of thin disks, are subjected to a high applied pressure and concurrent torsional straining. In principle, the strain introduced into the disk during the straining varies across the disk and there is a direct proportionality between the estimated strain and the radial position on the disk. This means that the strain is zero at the center of each HPT disk and it reaches a maximum value at the outer periphery. Contrary to these expectations, recent experiments show there is a gradual evolution with increasing numbers of revolutions such that the hardness of the disk gradually becomes reasonably homogeneous. This report examines the development of hardness and microstructural homogeneity with special emphasis on the evolution in hardness homogeneity along vertical sections of disks of high-purity aluminum processed by HPT. The results demonstrate that, at least for pure aluminum, the distributions in the hardness values are independent of the plane of sectioning.

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Periodical:

Materials Science Forum (Volumes 706-709)

Pages:

1805-1810

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.706-709.1805

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Online since:

January 2012

Authors:

Megumi Kawasaki, Terence G. Langdon

Keywords:

Aluminum (Al), Hardness, High Pressure Torsion (HPT), Homogeneity, Severe Plastic Deformation (SPD)

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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