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:
Long-range ordered intermetallic alloys with L12 (Ni3Al, Cu3Au) and B2 (FeAl)structures were deformed by high-pressure torsion at room temperature up to high grades ofdeformation. Transmission electron microscopy shows that disordering caused by the deformationoccurs on a very local scale within coarse grains along glide planes (Cu3Au, Ni3Al) and in the formof well defined local regions (Ni3Al, FeAl). The latter leads to a duplex structure consisting of anordered coarse-grained structure and a disordered nanocrystalline structure. The differentmechanisms that can lead to disordering during severe plastic deformation are discussed on thebasis of the different ordering energies and on the basis of antiphase boundaries associated withgliding dislocations. The results indicate that in intermetallic alloys the formation of ananocrystalline structure by severe plastic deformation is facilitated by the loss of order
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.422.pdf
