Nanostructures and Enhanced Propertiesin Tungsten and its Alloys Processed by Equal Channel Angular Pressing
Abstract
The present report presents the results of an experimental investigation and numerical simulation of the process of equal-channel angular pressing with a backpressure equal to 2.4 sigma(sub s) which have allowed to increase the accumulated strain rate up to e=7, what allows to obtain ultrafine-grained structure with a grain size less than 0.5 micrometers. Note should be made that in that case the punch loading was close to its calculated value, which is in conformity with the strength characteristics of the material and the die-set design. With the purpose of studying the influence of initial state on the ultrafine-grained structure formation there were carried out comparative investigations of the behavior of single- and polycrystalline tungsten during severe plastic deformation process. A possibility of reducing the severe plastic deformation temperature when using special sheathing for tungsten billets is being investigated. There were started investigations of the microstructure refinement of the W-2%Re alloy with enhanced strength and ductility at severe plastic deformation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 10, 2001
- Accession Number
- ADA395865
Entities
People
- I. V. Alexandrov
- R. Z. Valiev
Organizations
- Ufa State Aviation Technical University