Accession Number : ADA302046

Title :   Microstructure, Fracture Characteristics, and Tensile Properties of Two Tungsten Heavy Alloys.

Descriptive Note : Final rept. Jan 92-Mar 93,

Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Kennedy, Edward W.

PDF Url : ADA302046

Report Date : NOV 1995

Pagination or Media Count : 39

Abstract : The influence of microstructure on fracture behavior and tensile properties was investigated for two tungsten heavy alloys (93W-4.9Ni-2.1Fe and 91W-6Ni-3Co by weight-percentage) that are suitable materiai candidates for use as kinetic energy penetrators. Both alloys were evaluated in swaged and aged conditions. For comparable levels of swaging and aging, the W-Ni-Co alloy exhibited increased tensile strength and ductility compared to the W-Ni-Fe material. The W-Ni-Co alloy had a smaller average W grain size and a larger percentage of W in the matrix. Fracture surfaces of failed uniaxial tensile specimens tested at quasi-static and low-to-medium strain rates were characterized using scanning electron microscopy. The results indicate a strong relationship between microstructure, fracture behavior, and tensile properties as a function of alloy composition and strain rate. (MM)

Descriptors :   *FRACTURE(MECHANICS), *KINETIC ENERGY PROJECTILES, *TUNGSTEN ALLOYS, *HEAVY METALS, TENSILE STRENGTH, SCANNING ELECTRON MICROSCOPES, MICROSTRUCTURE, AGING(MATERIALS), TENSILE PROPERTIES, GRAIN SIZE, ALLOYS, STRAIN RATE, ELECTRON MICROSCOPY, IRON, PENETRATION, NICKEL, DUCTILITY, COBALT, SINTERING, SABOTS, SWAGING.

Subject Categories : Properties of Metals and Alloys
      Fabrication Metallurgy
      Ammunition and Explosives

Distribution Statement : APPROVED FOR PUBLIC RELEASE