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Topic Area: Materials Science
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Displaying records 431 to 440 of 531 records.
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431. Crack Tip Opening Angle: Measurement and Modeling of Fracture Resistance in Low and High Strength Pipeline Steels
Topic: Materials Science
Published: 9/1/2006
Authors: Philippe P. Darcis, Joseph David McColskey, Christopher N McCowan, Thomas Allen Siewert, Gabriel Kohn, Arry Bussiba, Richard Joel Fields
Abstract: Crack tip opening angle (CTOA) is becoming one of the more widely accepted properties for characterizing fully plastic fracture. In fact, it has been recognized as a measure of the resistance of a material to fracture, in cases where there is a large ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50312

432. Fatigue Crack Growth Rates in Five Pipeline Steels
Topic: Materials Science
Published: 9/1/2006
Authors: Arry Bussiba, Philippe P. Darcis, J D McCloskey, Christopher N McCowan, Thomas Allen Siewert, Gabriel Kohn, R P Smith, J. Merritt
Abstract: This study presents fatigue data for six different pipeline steels, with strengths ranging from Grade B to X100. A fatigue crack growth test for full-thickness pipeline samples was developed using a Middle Tension (MT) type specimen. The six steels s ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50360

433. Broadband coherent anti-strokes Raman spectroscopy characterization of polymer thin films
Topic: Materials Science
Published: 8/2/2006
Authors: Lee J Richter, M C. Gurau, Zachary Schultz
Abstract: Broadband coherent anti-Stokes Raman spectroscopy (CARS) is demonstrated as an effective probe of the polymer thin film materials. A simple modification to a commercially available 1 kHz SFG spectrometer permits acquisition of CARS spectra for polym ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902172

434. Second Symposium on Pendulum Impact Machines: Procedures and Specimens
Topic: Materials Science
Published: 8/1/2006
Authors: Thomas Allen Siewert, Christopher N McCowan, M. P. Manahan
Abstract: This publication consists primarily of the papers presented at the Second Symposium on Pendulum Impact Machines: Procedures and Specimens, sponsored by ASTM Committee E28 on Mechanical Testing and its Subcommittee E28.07 on Impact Testing. The Sympos ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50248

435. Phase Formation, Crystal Chemistry, and Properties in the Magnetic Dielectric System Bi^d2^O^d3-^Fe^d2^O^d3-^Nb^d2^O^d5^
Topic: Materials Science
Published: 6/22/2006
Authors: M W Lufaso, Terrell A Vanderah, I M Pazos, Igor Levin, Juan C Nino, Virgil Provenzano, Peter K. Schenck, Robert S. Roth
Abstract: Subsolidus phase relations have been determined for the Bi2O3-Fe2O3-Nb2O5 system in air (900-1075 C). Three new ternary phases were observed Bi3Fe0.5Nb1.5O9 with an Aurivillius-type structure, and two phases with approximate stoichiometries Bi17Fe2 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850944

436. An Octagonal Architecture for High Strength PIT Nb^d3^Sn Conductors
Topic: Materials Science
Published: 6/6/2006
Authors: L. R. Motowidlo, E Barzi, D. Turrioni, Najib Cheggour, Loren Frederick Goodrich
Abstract: Powder-in-Tube (PIT) Nb^d3^Sn conductors have been fabricated utilizing a low-cost intermetallic Cu^d5^Sn^d4^ powder as the tin source. A novel octagonal PIT design that incorporates dispersion strengthened copper as well as a hexagonal PIT design w ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900875

437. Kinetics Governing Phase Separation of Nanostructured Sn(x)Ge(1a 'x) Alloys.
Topic: Materials Science
Published: 6/5/2006
Authors: Regina Regan, Harry A Atwater, Jonathan E Guyer, Erik Meserole, Mark S Gorrsky
Abstract: We have studied the dynamic phenomenon of SnxGe1a 'x/Ge phase separation during deposition by molecular beam epitaxy on Ge(001) substrates.Phase-separation leads to the formation of direct bandgap semiconductor nanowire arrays embedded in Ge oriented ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853551

438. Effect of Self-Assembled Monolayer Film Order on Nanofriction
Topic: Materials Science
Published: 5/11/2006
Authors: S Sambasivan, S Hsieh, Daniel A Fischer, Stephen M. Hsu
Abstract: Self-assembled monolayers (SAMs) have increasingly being explored as potential protective films in devices friction and adhesion. However, accurate determination of the nanomechanical properties of monolayer films is difficult and fraught with uncert ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850918

439. Anisotropic elastic properties of nanocrystalline nickel thin films
Topic: Materials Science
Published: 5/1/2006
Authors: Donna C. Hurley, Roy Howard Geiss, N Jennett, Malgorzata Kopycinska-Mueller, A Maxwell, Jens Mueller, David Thomas Read, J Wright
Abstract: As length scales continue to shrink, new tools are needed to measure mechanical properties. We are developing two such tools using different nondestructive acoustical techniques. Surface acoustic wave spectroscopy (SAWS) uses laser-ultrasonic methods ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50050

440. NIST Recommended Practice Guide: DTA and Heat-Flux DSC Measurements of Alloy Melting and Freezing
Topic: Materials Science
Published: 4/30/2006
Authors: William J Boettinger, Ursula R Kattner, Kil Won Moon, John Perepezko
Abstract: This document is focused on differential thermal analysis (DTA) and heat-flux differential scanning calorimetry (HF-DSC) of metals and alloys. A thermal analysis guide focused only on metals and alloys is appropriate because they behave quite differ ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901091



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