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Topic Area: Metals

Displaying records 31 to 40 of 64 records.
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31. An electrical pulse-heated Kosky bar technique for high strain rate flow stress measurements of rapidly heated metals
Topic: Metals
Published: 9/13/2009
Authors: Steven P Mates, Stephen W Banovic, Richard L. Rhorer, Timothy J Burns, Eric Paul Whitenton, D Basak
Abstract: We have developed a unique electrical pulse-heated Kolsky Bar technique for measuring the flow stress of metals at heating rates of up to 6000 °C per second and strain rates up to 10^4 per second. Under these conditions, which are approaching those f ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901787

32. The Fundamental Relationships Between Deformation-Induced Surface Roughness, Critical Strain Localization, and Failure in AA5754-O
Topic: Metals
Published: 9/1/2009
Authors: Mark R Stoudt, Joseph Bunton Hubbard
Abstract: The apparent clustering observed in localized strain maps constructed from deformation-induced surface topographies generated in AA5754-O by three in-plane deformation modes were analyzed by two different methods. One used a conventional two-point a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854468

33. Frustrated magnetization reversal in Co/Pt multilayer films
Topic: Metals
Published: 7/13/2009
Authors: Joseph E. Davies, O Hellwig, Eric E. Fullerton, M. Winklhofer, Robert D Shull, Kai Liu
Abstract: The magnetization reversal behavior in Co/Pt multilayers with perpendicular anisotropy are studied by the first order reversal curve (FORC) method. In addition to the previously observed three stage reversal process where domains first nucleate, the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854449

34. A Study of the Fundamental Relationships Between Deformation-Induced Surface Roughness and Strain Localization in AA5754
Topic: Metals
Published: 7/1/2009
Authors: Mark R Stoudt, Joseph Bunton Hubbard, Mark A Iadicola, Stephen W Banovic
Abstract: This research characterizes deformation-induced surface roughness produced by 3, in plane, proportional strain modes to determine the microstructural conditions that promote strain localization in AA5754-O aluminum alloy sheet. Integrating high-reso ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854103

35. Crack tip opening angle: applications and developments in the pipeline industry
Topic: Metals
Published: 7/1/2009
Authors: Elizabeth S Drexler, Philippe Darcis, Richard Joel Fields, Joseph David McColskey, Christopher N McCowan, Roni Reuven, Thomas Allen Siewert
Abstract: One of the most difficult safety problems associated with gas pipeline to be solved is the control of ductile fracture propagation. To address this issue, the crack tip opening angle (CTOA) criterion is becoming one of the more widely accepted proper ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900921

36. High Strain Rate Tissue Simulant Measurements Using digital Image Correlation
Topic: Metals
Published: 6/1/2009
Authors: Steven P Mates, Richard L. Rhorer, Richard Everett, Kirth Simmonds, Amit Bagchi
Abstract: Measuring the response of soft materials to high strain rate deformation is extremely challenging because of the difficulty of achieving dynamic equilibrium during high strain rate mechanical testing such as Kolsky bar testing. Digital image correlat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902304

37. A reassessment of the Al-Fe system using a four sublattice model for the DO 3 ordering
Topic: Metals
Published: 4/9/2009
Authors: Ursula R Kattner, Bo Sundman, Ikuo Ohnuma, N Dupin, S Fries
Abstract: The Al-Fe system is important in many alloys and the new interest in iron aluminides makes it necessary to improve the modelling of the different ordered forms of the A2 lattice in this system. This has now been done using a 4 sublattice model based ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854460

38. Thermopower of Co-doped FeSe0.82
Topic: Metals
Published: 4/1/2009
Authors: Evan L. Thomas, Winnie K Wong-Ng, Daniel P. Phelan
Abstract: The effect of cobalt doping (0.05 ≤ x ≤ 0.50) on the thermopower of the newly discovered superconductor FeSe0.82 is investigated through electrical and thermal transport measurements. Our results point to the destruction of superconducti ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854463

39. Finite-element analysis and experimental investigation of probe shape effect on initial plastic yield
Topic: Metals
Published: 3/3/2009
Authors: Li Ma, Dylan Morris, Stefhanni Jennerjohn, David Bahr, Lyle E Levine
Abstract: Sudden displacement excursions during load-controlled nanoindentation of relatively dislocation-free surfaces of metals are frequently associated with dislocation nucleation, multiplication, and propagation. Insight into the nanomechanical origins of ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854131

40. 400-Fold Reduction in Saturation Field by Interlayering
Topic: Metals
Published: 1/13/2009
Authors: William F. Egelhoff Jr., John E Bonevich, Philip Pong, John Unguris, Robert D McMichael, Gery R Stafford, Carlos R Beauchamp
Abstract: The buildup of stress with increasing thickness of magnetic thin films is a common phenomenon that often induces undesirable saturation fields that can convert an otherwise magnetically soft film into a magnetically hard one. We have found that by i ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854046



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