8 Matching Results

Search Results

Advanced search parameters have been applied.

in creator/contributor: "MICHAEL,JOSEPH R."

open access

Phase Identification of Individual Crystalline Particles by Electron Backscatter Diffraction (EBSD)

Recently, an EBSD system was developed that uses a 1024 x 1024 CCD camera coupled to a thin phosphor. This camera has been shown to produce excellent EBSD patterns. In this system, crystallographic information is determined from the EBSD pattern and coupled with the elemental information from energy or wavelength dispersive x-ray spectrometry. Identification of the crystalline phase of a sample is then made through a link to a commercial diffraction database. To date, this system has been appli… more

Date: June 12, 2000

Creator: Small, J. A. & Michael, Joseph R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Small area analysis using micro-diffraction techniques

An overall trend toward smaller electronic packages and devices makes it increasingly important and difficult to obtain meaningful diffraction information from small areas. X-ray micro-diffraction, electron back-scattered diffraction (EBSD) and Kossel are micro-diffraction techniques used for crystallographic analysis including texture, phase identification and strain measurements. X-ray micro-diffraction primarily is used for phase analysis and residual strain measurements. X-ray micro-diffrac… more

Date: February 11, 2000

Creator: GOEHNER,RAYMOND P.; TISSOT JR.,RALPH G. & MICHAEL,JOSEPH R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Nanotechnology: Promises and challenges for tomorrow

Nanotechnology is based on the ability to create and utilize materials, devices and systems through control of the matter at the nanometer scale. If successful, nanotechnology is expected to lead to broad new technological developments. The efficiency of energy conversion can be increased through the use of nanostructured materials with enhanced magnetic, light emission or wear resistant properties. Energy generation using nanostructured photovoltaics or nanocluster driven photocatalysis could … more

Date: February 29, 2000

Creator: ROMIG JR.,ALTON D.; MICHAEL,JOSEPH R. & MICHALSKE,TERRY A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Fusion Welding of AerMet 100 Alloy

A database of mechanical properties for weldment fusion and heat-affected zones was established for AerMet{reg_sign}100 alloy, and a study of the welding metallurgy of the alloy was conducted. The properties database was developed for a matrix of weld processes (electron beam and gas-tungsten arc) welding parameters (heat inputs) and post-weld heat treatment (PWHT) conditions. In order to insure commercial utility and acceptance, the matrix was commensurate with commercial welding technology an… more

Date: August 1, 1999

Creator: ENGLEHART, DAVID A.; MICHAEL, JOSEPH R.; Novotny, Paul M. & Robino, Charles V.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Welding Behavior of Free Machining Stainless Steel

The weld solidification and cracking behavior of sulfur bearing free machining austenitic stainless steel was investigated for both gas-tungsten arc (GTA) and pulsed laser beam weld processes. The GTA weld solidification was consistent with those predicted with existing solidification diagrams and the cracking response was controlled primarily by solidification mode. The solidification behavior of the pulsed laser welds was complex, and often contained regions of primary ferrite and primary aus… more

Date: July 24, 2000

Creator: Brooks, John A.; Robino, Charles V.; Headley, Thomas J. & Michael, Joseph R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

On the influence of applied fields on spinel formation

Interfaces play an important role in determining the effect of electric fields on the mechanism of the formation spinel by solid-state reaction. The reaction occurs by the movement of phase boundaries but the rate of this movement can be affected by grain boundaries in the reactants or in the reaction product. Only by understanding these relationships will it be possible to engineer their behavior. As a particular example of such a study, MgIn{sub 2}O{sub 4} can be formed by the reaction betwee… more

Date: April 4, 2000

Creator: Korte, C.; Farer, J. K.; Ravishankar, N.; Michael, Joseph R.; Schmalzried, J. & Carter, C. B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Characterization of the Effect of Au/Al Bondpad Corrosion on Microelectronic Device Reliability

A methodology has been established to predict the effect of atmospheric corrosion on the reliability of plastic encapsulated microelectronic (PEM) devices. New experimental techniques were developed to directly characterize the Al/Au wirebond interface where corrosion primarily occurs. A deterministic empirical model describing wirebond degradation as a function of environmental conditions was generated. To demonstrate how this model can be used to determine corrosion effects on device reliabil… more

Date: October 7, 1999

Creator: Braithwaite, Jeffrey W.; Michael, Joseph R.; Peterson, David W.; Robinson, David G.; Sorensen, Neil R. & Strizich, M. P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Characterization of microstructure and crack propagation in alumina using orientation imaging microscopy (OIM)

TEM, while capable of determining misorientation of adjacent grains, can practicably provide information only for a small number of grain boundaries. A more complete description of the structure of a polycrystal can be obtained using a new technique OIM, which uses crystallographic orientation data obtained from Backscattered Electron Kikuchi patterns (BEKP), collected using SEM. This paper describes general OIM results for 99.7 and 99.99% Al{sub 2}O{sub 3} samples with grain sizes 4-27 {mu}m. … more

Date: December 1, 1996

Creator: Glass, S. Jill; Michael, Joseph R.; Readey, Michael J.; Wright, Stuart I. & Field, David P.

Item Type: Article

Partner: UNT Libraries Government Documents Department