Open AccessProperties and processing of nanocrystalline materials. Quarterly report
Author(s) -
Р. З. Валиев
Publication year - 1996
Language(s) - English
Resource type - Reports
DOI - 10.2172/427010
Subject(s) - severe plastic deformation , nanocrystalline material , materials science , pressing , grain size , torsion (gastropod) , deformation (meteorology) , metallurgy , composite material , high pressure , engineering physics , nanotechnology , engineering , medicine , surgery
The present Report completes the investigations in the frame of the project for the first year. It is important to estimate our achievements in the investigation of properties of nanocrystalline materials obtained by severe plastic deformation and their production. We think that the main results obtained can be summarized as follows: (1) We performed an improvement of the die-set for equal channel (ECA) pressing and torsion under high pressure with the aim to increase dimensions of the samples produced and to conduct processing of low ductile materials. (2) It was established that in pure metals severe plastic deformation led to the formation of an ultra fine-grained structure with a mean grain size of 100-200 nm, while in alloys due to severe plastic deformation and/or special methods of treatment (a decrease in the temperature of deformation, an increase of the pressure applied etc.) the grain size could be decreased down to a few tens of manometers