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Ab initio study of the modification of elastic properties of alpha-iron by hydrostatic strain and by hydrogen interstitials

D. Psiachos, T. Hammerschmidt, R. Drautz

Acta Materialia, 59, 4255-4263, (2011)

DOI: 10.1016/j.actamat.2011.03.041

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The effect of hydrostatic strain and of interstitial hydrogen on the elastic properties of alpha iron is investigated using ab initio density-functional theory calculations. We find that the cubic elastic constants and the polycrystalline elastic moduli to a good approximation decrease linearly with increasing hydrogen concentration. This net strength reduction can be partitioned into a strengthening electronic effect which is overcome by a softening volumetric effect. The calculated hydrogen-dependent elastic constants are used to determine the polycrystalline elastic moduli and anisotropic shear moduli. For the key slip planes in alpha-iron, $left[1overline{1}0right]$ and $left[11overline{2}right]$, we find a shear modulus reduction of approximately 1.6% per at.% H.

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{"type":"article", "name":"d.psiachos20116", "author":"D. Psiachos and T. Hammerschmidt and R. Drautz", "title":"Ab initio study of the modification of elastic properties of alphairon by hydrostatic strain and by hydrogen interstitials", "journal":"Acta Materialia", "volume":"59", "OPTnumber":"", "OPTmonth":"6", "year":"2011", "OPTpages":"4255-4263", "OPTnote":"", "OPTkey":"steels; density functional theory", "DOI":"10.1016/j.actamat.2011.03.041"}
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