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Title: Mechanical properties of zirconium alloys and zirconium hydrides predicted from density functional perturbation theory

Journal Article · · Dalton Transactions
DOI: https://doi.org/10.1039/c5dt03403e · OSTI ID:1259850
 [1];  [2];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Univ. of Nevada, Las Vegas, NV (United States)

Here, the elastic properties and mechanical stability of zirconium alloys and zirconium hydrides have been investigated within the framework of density functional perturbation theory. Results show that the lowest-energy cubic Pn-3m with combining macron]m polymorph of δ-ZrH1.5 does not satisfy all the Born requirements for mechanical stability, unlike its nearly degenerate tetragonal P42/mcm polymorph. Elastic moduli predicted with the Voigt–Reuss–Hill approximations suggest that mechanical stability of α-Zr, Zr-alloy and Zr-hydride polycrystalline aggregates is limited by the shear modulus. According to both Pugh's and Poisson's ratios, α-Zr, Zr-alloy and Zr-hydride polycrystalline aggregates can be considered ductile. The Debye temperatures predicted for γ-ZrH, δ-ZrH1.5 and ε-ZrH2 are θD = 299.7, 415.6 and 356.9 K, respectively, while θD = 273.6, 284.2, 264.1 and 257.1 K for the α-Zr, Zry-4, ZIRLO and M5 matrices, i.e. suggesting that Zry-4 possesses the highest micro-hardness among Zr matrices.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Nuclear Energy (NE), Fuel Cycle Technologies (NE-5)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1259850
Report Number(s):
SAND--2015-6776J; 598887
Journal Information:
Dalton Transactions, Journal Name: Dalton Transactions Journal Issue: 43 Vol. 44; ISSN 1477-9226; ISSN ICHBD9
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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First-Principles Structural, Mechanical, and Thermodynamic Calculations of the Negative Thermal Expansion Compound Zr 2 (WO 4 )(PO 4 ) 2 journal November 2018
Model representations of kerogen structures: An insight from density functional theory calculations and spectroscopic measurements journal August 2017
Elastic stiffness tensors of Zr-$x$Nb alloy in presence of defects: A molecular dynamics study text January 2019
Infrared and Raman spectroscopy of α-ZrW 2 O 8 : A comprehensive density functional perturbation theory and experimental study journal May 2018
Ultrasonic study of Laves phase compounds ScOs2 and YOs2 journal February 2019
Zirconium chloride molecular species: combining electron impact mass spectrometry and first principles calculations journal April 2019
Phase diagram and superconductivity of compressed zirconium hydrides journal January 2017
Zirconium chloride molecular species: combining electron impact mass spectrometry and first principles calculations text January 2019

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