In situ heat generation and strain localization of polycrystalline and nanocrystalline nickel

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TypeArticle
Proceedings titleConference Proceedings of the Society for Experimental Mechanics Series
Conference2011 SEM Annual Conference on Experimental and Applied Mechanics, 13 June 2011 through 16 June 2011, Uncasville, CT
ISSN2191-5644
ISBN9781461402060
Volume7
Pages1723; # of pages: 7
SubjectConversion factor; Defect formation; Deformation mechanism; Digital image correlations; Grain size; High resolution; In-situ; Lattice distortions; Maximum temperature; Nano-crystalline nickel; Nanocrystallines; Polycrystalline and nanocrystalline nickels; Polycrystalline nickels; Room temperature; Strain localizations; Tensile specimens; Ultimate tensile strength; Deformation; Grain size and shape; Infrared imaging; Nickel; Strain rate
AbstractCommercially available polycrystalline nickel (NI200; grain size: 30 μm) and electrodeposited nanocrystalline nickel (grain size: 30 nm) were analyzed for the phenomena of in-situ heat generation and strain localization during plastic deformation at room temperature. Tensile specimens according to ASTM E8 standard dimensions were tested at a strain rate of 10 -2/s to record the amount of heat dissipated and the change of localized strain using a high resolution infrared detector and digital image correlation (DIC) camera, respectively. For deformation close to ultimate tensile strength, data recorded for the maximum temperature increase and localized strain for nanocrystalline were 11°C and 4.5%, whereas polycrystalline nickel showed 17°C and 60%, respectively. The amount of heat generated locally by strain is related by the heat conversion factor (i.e. Taylor Quinney coefficient). Polycrystalline nickel showed a decreasing trend of heat conversion due to lattice distortions or defect formation during deformation. In contrast, nanocrystalline nickel showed an increasing trend, likely due to differences in deformation mechanisms.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Aerospace (AERO-AERO)
Peer reviewedYes
NPARC number21271129
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Record identifier655ff6ee-519e-4c88-b483-7e30d8c2e399
Record created2014-03-24
Record modified2016-05-09
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