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Articles 1 - 2 of 2
Full-Text Articles in Operations Research, Systems Engineering and Industrial Engineering
Fatigue-Induced Grain Coarsening In Nanocrystalline Platinum Films, Roi A. Meirom, Daan Hein Alsem, Amber L. Romasco, Trevor Clark, Ronald G. Polcawich, Jeffrey S. Pulskamp, Madan Dubey, Robert O. Ritchie, Christopher L. Muhlstein
Fatigue-Induced Grain Coarsening In Nanocrystalline Platinum Films, Roi A. Meirom, Daan Hein Alsem, Amber L. Romasco, Trevor Clark, Ronald G. Polcawich, Jeffrey S. Pulskamp, Madan Dubey, Robert O. Ritchie, Christopher L. Muhlstein
US Army Research
Mechanisms to explain the unique mechanical behavior of nanograined metals focus primarily on grain and grain boundary mobility. In most nanograined metal materials systems (both pure and alloyed) it has not been possible to decouple these time- and cycle-dependent contributions. In contrast, the 460 nm thick, (1 1 1) textured, nanograined platinum thin films evaluated in this work have robust grain morphologies that allow us to uniquely identify the fatigue damage accumulation processes. Unlike other reports of face-centered cubic metal behavior, the platinum films exhibited a particularly limited range of fatigue crack growth (<3 MPa √m) with extremely large (~10.5) power law exponents typically associated with fatigue of structural ceramics and ordered intermetallics. Transmission electron microscopy and fatigue crack growth data suggest that the crack growth mechanism appears to be intrinsic in origin and dislocation mediated.
Structure–Property Relations Of Cyclic Damage In A Wrought Magnesium Alloy, J. D. Bernard, J. B. Jordon, M. F. Horstemeyer, H. El Kadiri, J. Baird, Dabid Lamb, Alan A. Luo
Structure–Property Relations Of Cyclic Damage In A Wrought Magnesium Alloy, J. D. Bernard, J. B. Jordon, M. F. Horstemeyer, H. El Kadiri, J. Baird, Dabid Lamb, Alan A. Luo
US Army Research
The fatigue properties of an extruded Mg–3Al–0Mn magnesium alloy component were evaluated experimentally. Fully reversed, strain control fatigue tests were conducted on specimens extracted from regions with a varying grain size and texture. Scanning electron microscopy was employed to establish structure–property relations between microstructure and cyclic damage. Relations were drawn between microstructural features such as particle size, grain size, initial Taylor factor and the number of cycles to failure.