Factors Influencing the Development of Homogeneity in Disks Processed by High-Pressure Torsion
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.
Yuri Estrin and Hans Jürgen Maier
C. Xu et al., "Factors Influencing the Development of Homogeneity in Disks Processed by High-Pressure Torsion ", Materials Science Forum, Vols. 584-586, pp. 3-8, 2008