The effect of stoichiometry in C15 HfCo[sub 2]

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In binary Laves phases (AB{sub 2}) that exhibit a homogeneity range, the ability to accommodate nonstoichiometry is related to the atomic size requirements for the topologically close-packed structure. Based upon a hard sphere model, Laves phases with a metallic atom size ratio R{sub A}/R{sub B} close to the ideal value of {approx}1.225 exhibit homogeneity ranges. The C15 phase, HfCo{sub 2}, has a radius ratio of R{sub H}/R{sub Co} = 1.26 and a reported range of solubility of 9 at.%. The solubility limits and constitutional defects have been investigated, and with this information, the elastic and mechanical properties as a function ... continued below

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4 p.

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Thoma, D. J. (Dan J.); Chen, K. C. (Katherine C.); Baskes, M. I. (Michael I.) & Peterson, E. J. (Eric J.) January 1, 2001.

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In binary Laves phases (AB{sub 2}) that exhibit a homogeneity range, the ability to accommodate nonstoichiometry is related to the atomic size requirements for the topologically close-packed structure. Based upon a hard sphere model, Laves phases with a metallic atom size ratio R{sub A}/R{sub B} close to the ideal value of {approx}1.225 exhibit homogeneity ranges. The C15 phase, HfCo{sub 2}, has a radius ratio of R{sub H}/R{sub Co} = 1.26 and a reported range of solubility of 9 at.%. The solubility limits and constitutional defects have been investigated, and with this information, the elastic and mechanical properties as a function composition were experimentally investigated. The results indicate that anti-site substitution is the governing defect mechanism on both sides of stoichiometry, The elastic and mechanical properties show a maximum at stoichiometry (unlike most intermetallics), with the brittle behavior decreasing with increasing Co content. The properties are described in terms of geometric models of space filling.

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4 p.

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  • "Submitted to: PRICM4, December 11-15, 2001, Honolulu, Hawaii"

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  • Report No.: LA-UR-01-2649
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 975326
  • Archival Resource Key: ark:/67531/metadc933329

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 2001

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 9, 2016, 11:22 p.m.

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Thoma, D. J. (Dan J.); Chen, K. C. (Katherine C.); Baskes, M. I. (Michael I.) & Peterson, E. J. (Eric J.). The effect of stoichiometry in C15 HfCo[sub 2], article, January 1, 2001; United States. (digital.library.unt.edu/ark:/67531/metadc933329/: accessed August 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.