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:
Severe plastic deformation, SPD, enables the grain refinement of bulk materials.However, at strains larger than a critical value, no further microstructural refinement can beobserved. This regime is denoted as saturation region of the microstructural size. It will be shownthat this regime can be divided into a thermal and an athermal part. The transition between thesetwo regimes was examined in an Al-3wt.%Mg alloy. The single phase alloy was deformed by highpressure torsion (HPT) at various temperatures and different rotational speeds. During the HPTdeformationthe flow stress was measured by a torque cell in a temperature range between -196°C(evaporation temperature of the liquid nitrogen) and 450°C. The temperature and the strain ratedependent behavior reveal a shift of the onset of the thermal activated regime towards highertemperatures by an increase of the strain rate
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.938.pdf
