Factors influencing the development of homogeneity in disks processed by high-pressure torsion

Xu, Cheng, Zhilyaev, Alexander P., Horita, Zenji and Langdon, Terence G. (2008) Factors influencing the development of homogeneity in disks processed by high-pressure torsion. Materials Science Forum, 584-586, 3-8. (doi:10.4028/0-87849-375-1.3).

Record type: Article

Abstract

High-pressure torsion (HPT) is an important processing technique in which a disk is subjected to a high pressure with concurrent torsional straining. In principle at least, the imposed strain is zero at the center of the disk and a maximum at the outer edge. This difference suggests, therefore, that materials processed by HPT will exhibit considerable inhomogeneity. This paper describes the results obtained in a series of experiments which were designed to evaluate the evolution of homogeneity during the processing of two materials by HPT. It is demonstrated that it is possible to achieve a reasonable level of homogeneity in both materials but there are important differences which reflect the dependence of the microstructure on the occurrence of dynamic recovery.

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