Physical Metallurgy Of Tungsten And Tungsten Base Alloys

Item

Title
Physical Metallurgy Of Tungsten And Tungsten Base Alloys
Description
In continuation of previous contract AF 33(616)-5632 on tungsten and tungsten base alloys, fundamental properties of high purity tungsten produced both by powder metallurgy techniques and, in the form of single crystals, by electron beam zone melting were studied. High temperature properties of several dispersed second-phase tungsten base alloys were also investigated.Additional base line data on the metallurgical properties of pure tungsten for temperatures above 2500°F were also obtained. The mechanism of purification in tungsten during zone melting was studied in order to understand the formation of pores and the effect of pores on growth variables. The flow and fracture characteristics of tungsten single crystal tensiles were investigated as functions of annealing temperature and atmosphere. Internal friction measurements were carried out at 20 to 800°C on high purity and dosed polycrystalline tungsten wires and single crystals of tungsten. Internal friction damping peaks were tentatively identified to be due to carbon and oxygen. Methods of dosing interstitials into tungsten were further explored.The mechanical properties of dispersed second-phase tungsten base alloys such as W-ThO2, W-TaC and W-HfO2 were studied at temperatures above 2500° F. Previously obtained results on the high temperature strength of the alloys W-ThO2 and W-TaC were confirmed, and it was found that these alloys retain their margin of strength over that of pure tungsten even at 3000°F.A theoretical investigation of the elastic properties of tungsten and other b.c.c. metals in relationship to the ductile-brittle transition was initiated, and background information was compiled and analyzed
Date
1961
Index Abstract
Contrails and DTIC condensed and truncated
Photo Quality
Incomplete
Report Number
WADD TR 60-37 Part II
Creator
Sell, Heinz G.
Keith, George H.
Koo, Ronald C.
Schnitzel, Randolph H.
Corth, Richard
Corporate Author
Westinghouse Electric Corporation
Laboratory
Directorate of Materials and Processes
Extent
143
Identifier
AD0266330
Access Rights
OTS
Distribution Classification
1
Contract
AF 33(616)-6933
DoD Task
73512
DTIC Record Exists
Yes
Distribution Change Authority Correspondence
None
Report Availability
Full text available by request
DoD Project
7351 - Metallic Materials
Date Issued
1961-06
Abstract
In continuation of previous contract AF 33(616)-5632 on tungsten and tungsten base alloys, fundamental properties of high purity tungsten produced both by powder metallurgy techniques and, in the form of single crystals, by electron beam zone melting were studied. High temperature properties of several dispersed second-phase tungsten base alloys were also investigated.Additional base line data on the metallurgical properties of pure tungsten for temperatures above 2500°F were also obtained. The mechanism of purification in tungsten during zone melting was studied in order to understand the formation of pores and the effect of pores on growth variables. The flow and fracture characteristics of tungsten single crystal tensiles were investigated as functions of annealing temperature and atmosphere. Internal friction measurements were carried out at 20 to 800°C on high purity and dosed polycrystalline tungsten wires and single crystals of tungsten. Internal friction damping peaks were tentatively identified to be due to carbon and oxygen. Methods of dosing interstitials into tungsten were further explored.The mechanical properties of dispersed second-phase tungsten base alloys such as W-ThO2, W-TaC and W-HfO2 were studied at temperatures above 2500° F. Previously obtained results on the high temperature strength of the alloys W-ThO2 and W-TaC were confirmed, and it was found that these alloys retain their margin of strength over that of pure tungsten even at 3000°F.A theoretical investigation of the elastic properties of tungsten and other b.c.c. metals in relationship to the ductile-brittle transition was initiated, and background information was compiled and analyzed
Type
report
Provenance
Lockheed Martin Missiles & Fire Control
Subject
Heat Resistant Alloys
Powder Alloys
Powder Metals
Tungsten
Tungsten Alloys
Atomic Structure
Chemical Analysis
Creep
Crystal Lattices
Crystallization
Crystals
Elastic Properties
Electron Beams
Fracture (Mechanics)
Growth (Physiology)
Heat Treatment
High Temperature
Impurities
Laboratory Furnaces
Manufacturing
Mechanical Properties
Microstructure
Powder Metallurgy
Processing
Purification
Rupture
Single Crystals
Tensile Properties
Transition Temperature
Publisher
Wright-Patterson Air Force Base, OH : Aeronautical Systems Division, Air Force Systems Command, United States Air Force
Distribution Conflict
No