Accession Number : ADA335381

Title :   Superplasticity of Ultra-Fine Grained Aluminium Alloys

Descriptive Note : Final rept.

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

Personal Author(s) : Valiev, R. Z. ; Islamgaliev, R. K. ; Tsenev, N. K.

PDF Url : ADA335381

Report Date : DEC 1997

Pagination or Media Count : 16

Abstract : Superplasticity requires a fine grain size, typically in the range of 1 - 10 microns. Experiments have established that much finer grain sizes, in the near-nanometer range, may be achieved in Al-based alloys by using an intense plastic straining technique such as equal-channel angular (ECA) pressing. This report presents the microstructural characteristics and mechanical properties of several ultrafine-grained Al-based alloys processed by ECA pressing. The first demonstration of enhanced superplasticity at low temperatures and high strain rates revealed in commercial Al-alloys, having ultrafine-grained structure, are described.

Descriptors :   *ALUMINUM ALLOYS, *FINE GRAINED MATERIALS, *ULTRAFINES, *SUPERPLASTICITY, LOW TEMPERATURE, MECHANICAL PROPERTIES, MICROSTRUCTURE, INTENSITY, GRAIN SIZE, STRAIN RATE, PLASTIC PROPERTIES, RUSSIA, GRAIN BOUNDARIES.

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE