Accession Number:

ADA399187

Title:

Nanostructures and Enhanced Properties in Tungsten and its Alloys Processed by Equal Channel Angular Pressing

Descriptive Note:

Interim rept. no. 3, 11 Oct 2001-10 Jan 2002

Corporate Author:

UFA STATE AVIATION TECHNICAL UNIV (RUSSIA) INST OF PHYSICS OF ADVANCED MATERIALS

Personal Author(s):

• Valiev, R. Z.
• Alexandrov, I. V.

Report Date:

2002-01-10

Pagination or Media Count:

5.0

Abstract:

In this connection, in the frame of the third period of the present project there have been conducted experimental investigations, aimed at equal channel angular pressing ECAP optimization of the investigated W and the 90W-8Ni-2Fe alloy. The problem of this task consists in enhancing workability of these hard-to-deform materials and achieving large strains, The influence of the accumulated strain degree the thickness of protection casing, the rate and strain temperatures on grain size and homogeneity of the obtained structure have been investigated as parameters, determining ECAP results. ECAP has been realized on route C, which turns out to be the most effective route for the given case, as it has been found out at first stages of the project.

Descriptors:

• *STRESS STRAIN RELATIONS
• *FINITE ELEMENT ANALYSIS
• *ALLOYS
• *TUNGSTEN
• *GRAIN STRUCTURES(METALLURGY)
• *NANOSTRUCTURES
• PLASTIC DEFORMATION
• MATHEMATICAL MODELS
• ANGLES
• TEMPERATURE
• THICKNESS
• EXPERIMENTAL DATA
• OPTIMIZATION
• DEFORMATION
• THEORY
• NUMERICAL ANALYSIS
• HIGH PRESSURE
• GRAIN SIZE
• REFINING
• FRICTION
• BACK PRESSURE
• TORSION
• PLASTIC FLOW
• PRESSING(FORMING)
• MICROHARDNESS

Subject Categories:

• Properties of Metals and Alloys
• Numerical Mathematics
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE