ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
This study introduces a process of high-pressure torsion (HPT) using ring samples andcompares with the results of conventional disk HPT. Both types of HPT were conducted at roomtemperature on pure Al and pure Cu. The microhardness was measured along the diameters of thedisks and rings. Microstructures were examined using transmission electron microscopy. Whenhardness values were plotted against equivalent strain, all data points fell on a single line for eachmaterial. There was a hardness maximum for pure Al but no such a maximum was present in pure Cu.In pure Al, many dislocations were visible within grains up to the equivalent strain corresponding tothe hardness maximum but beyond this strain, grains with low dislocation density appear. Allmaterials exhibited steady state where the hardness remains constant with respect to imposedequivalent strain. This study concludes that use of ring samples is effective as an alternative to thedisk samples
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.191.pdf
Permalink