Mechanical behavior of zirconium and hafnium in tension and compression |
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Authors: | Laura B Addessio Ellen K Cerreta III" target="_blank">George T GrayIII |
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Affiliation: | (1) the Metallurgy and Materials Engineering Department, Colorado School of Mines, 80401 Golden, CO;(2) the Materials Science and Technology Division, Los Alamos National Laboratory, 87545 Los Alamos, NM |
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Abstract: | The mechanical behavior and substructural evolution of highly textured hafnium (Hf) has been examined in tension and compression
and compared to the mechanical response of zirconium (Zr). The quasi-static work-hardening rate as a function of strain for
both metals exhibits a compression-tension asymmetry. Both Zr and Hf exhibit a downward work-hardening response in tension,
while each displays a parabolic and then concave upward work-hardening behavior in compression. Additionally, Hf displays
higher flow stresses than Zr both in tension and compression. The stress-strain and strain-hardening curves for Zr and Hf
have been characterized in terms of their propensity for deformation twinning and evolution of substructure with strain. Differences
in the work-hardening rates and flow stresses as a function of the sense of the applied load and material are discussed in
terms of slip-twin interactions during deformation. |
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Keywords: | |
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