Accession Number : ADA189611

Title :   Processing, Structure and Properties of Heavily Deformed in Situ Composites.

Descriptive Note : Final rept. Aug 84-1 Oct 87,

Corporate Author : MICHIGAN TECHNOLOGICAL UNIV HOUGHTON DEPT OF METALLURGICAL ENGINEERING

Personal Author(s) : Courtney, T H ; Lee, J K

PDF Url : ADA189611

Report Date : 05 Dec 1987

Pagination or Media Count : 25

Abstract : This report describes the results of work conducted on the properties, structure, processing and thermal stability of heavily cold worked two phase metallic alloys. These are also known as heavily deformed in situ composites (HDISC). The primary reason for studying these kinds of materials is that two phase materials work harden more rapidly than do single phase ones (1-6). In fact, when subjected to true deformation strains greater than about three, strengths of two phase combinations usually significantly exceed those expected by volumetrically averaging the strengths developed in the single phase constituents subjected to the same strains. At true deformation strains on the order of ten, strengths approaching the theoretical ones are obtained in some two phase metal combinations. This enhanced strain hardening has been observed in a number of two phase metal alloys. Examples include silver-copper, silver-ion, copper-iron, copper-niobium, silver-nickel, copper-chromium, and nickel-tungsten. There is another reason for studying these materials. In particular, their fabrication takes place by relatively straightforward means, and thus they offer the potential for developing relatively inexpensive metal matrix composites.

Descriptors :   *THERMAL STABILITY, *BINARY ALLOYS, ALLOYS, METAL MATRIX COMPOSITES, METALS, STRAIN HARDENING, METALLOGRAPHY, DEFORMATION, MICROSTRUCTURE, COLD WORKING, STRENGTH(MECHANICS)

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE