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Mechanical Behavior of Grain Boundary Engineered Copper

Description: A grain boundary engineered copper sample previously characterized by Electron Backscatter Diffraction (EBSD) has been selected for nanoindentation tests. Given the fact that grain boundaries have thicknesses in the order of 1 micron or less, it is essential to use nanomechanics to test the properties of individual grain boundaries. The Hysitron nanoindenter was selected over the MTS nanoindenter due to its superior optical capabilities that aid the selection and identification of the areas to … more
Date: August 8, 2006
Creator: Carter, S B & Hodge, A M
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Correlation of Substructure With Mechanical Properties of Plastically Deformed Reactor Structural Materials. Progress Report, January 1, 1976--June 30, 1977

Description: Transmission electron microscopy used to evaluate the deformation (creep, fatigue and tensile) induced microstructure of 304 SS, Incoloy 800, 330 SS and three of the experimental alloys (E19, E23 and E36) obtained from the National Alloy Program clearly shows that the relationship between the subgrain size (lambda) and the applied stress (sigma) obeys the equation lambda = Ab (sigma/E)/sup -1/ where A is a constant of the order of 4, b the Burgers rector and E is Young's modulus. Hot-hardness s… more
Date: July 8, 1977
Creator: Moteff, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Adiabatic shear band formation in explosively driven AerMet-100 alloy cylinders

Description: Two differently heat-treated AerMet-100 alloy cylinders were explosively driven to fragmentation. Soft-captured fragments were studied to characterize the deformation and damage induced by high explosive loading. The characterization of the fragments reveals that the dominant failure mechanism appears to be dynamic fracture along adiabatic shear bands. These shear bands differ in size and morphology depending on the heat-treated conditions. Nanoindentation measurements of the adiabatic shear ba… more
Date: February 8, 2006
Creator: Sunwoo, A J; Becker, R; Goto, D M; Orzechowski, T J; Springer, H K; Syn, C K et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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AISI/DOE Technology Roadmap Program: Development of Appropriate Resistance Spot Welding Practice for Transformation-Hardened Steels

Description: This report describes work accomplished in the project, titled ''Development of Appropriate Resistance Spot Welding Practice for Transformation-Hardened Steels.'' The Phase 1 of the program involved development of in-situ temper diagrams for two gauges of representative dual-phase and martensitic grades of steels. The results showed that tempering is an effective way of reducing hold-time sensitivity (HTS) in hardenable high-strength sheet steels. In Phase 2, post-weld cooling rate techniques, … more
Date: July 8, 2002
Creator: Chuko, Wayne & Gould, Jerry
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Nitrogen Implantation Effects on the Chemical Bonding and Hardness of Boron and Boron Nitride Coatings

Description: Boron nitride (BN) coatings are deposited by the reactive sputtering of fully dense, boron (B) targets utilizing an argon-nitrogen (Ar-N{sub 2}) reactive gas mixture. Near-edge x-ray absorption fine structure analysis reveals features of chemical bonding in the B 1s photoabsorption spectrum. Hardness is measured at the film surface using nanoindentation. The BN coatings prepared at low, sputter gas pressure with substrate heating are found to have bonding characteristic of a defected hexagonal … more
Date: February 8, 1999
Creator: Anders, S.; Felter, T.; Hayes, J.; Jankowski, Alan Frederic; Patterson, R.; Poker, D. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Annealing to Mitigate Pitting in Electropolished Niobium Coupons and SRF Cavities

Description: Ongoing studies at Fermilab investigate whether dislocations and other factors instigate pitting during cavity electropolishing (EP), despite careful processing controls and the inherent leveling mechanism of EP itself. Here, cold-worked niobium coupons, which exhibited increased tendencies for pitting in our past study, were annealed in a high vacuum furnace and subsequently processed by EP. Laser confocal scanning microscopy and special defect counting algorithms were used to assess the popul… more
Date: June 8, 2011
Creator: Cooley, L. D.; Hahn, E.; Hicks, D.; Romanenko, A.; Schuessler, R. & Thompson, C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Nanohardness and Chemical Bonding of Boron Nitride Films

Description: Boron-nitride (BN) films are deposited by the reactive sputter deposition of fully dense, boron targets utilizing a planar magnetron source and an argon-nitrogen working gas mixture. Near-edge x-ray absorption fine structure analysis reveals distinguishing features of chemical bonding within the boron is photoabsorption cross-section. The hardness of the BN film surface is measured using nanoindentation. The sputter deposition conditions as well as the post-deposition treatments of annealing an… more
Date: July 8, 1998
Creator: Jankowski, Alan Frederic
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

GAMMA IRRADIATION TESTING OF MONTAN WAX FOR USE IN WASTE MANAGEMENT SYSTEMS

Description: A field demonstration was funded by the US Department of Energy (DOE) to quantify the potential use of montan wax as a subsurface barrier material for nuclear waste management applications. As part of that demonstration, a study was completed to address some of the characteristics of the wax. Of particular interest is its resistance to chemical and structural changes that would influence its integrity as a barrier to minimize the migration of contaminants from their storage or disposal location… more
Date: September 8, 1996
Creator: Soo, P.; Heiser, J. & Hart, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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