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Ab initio calculations of mechanical properties of bcc W-Re-Os random alloys: effects of transmutation of W
Dalian Univ Technol, Key Lab Mat Modificat Laser Electron & Ion Beams, Minist Educ, Dalian 116024, Peoples R China.;Royal Inst Technol, Appl Mat Phys, Dept Mat Sci & Engn, SE-10044 Stockholm, Sweden..
Royal Inst Technol, Appl Mat Phys, Dept Mat Sci & Engn, SE-10044 Stockholm, Sweden..
Royal Inst Technol, Appl Mat Phys, Dept Mat Sci & Engn, SE-10044 Stockholm, Sweden..
Royal Inst Technol, Appl Mat Phys, Dept Mat Sci & Engn, SE-10044 Stockholm, Sweden..
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2016 (English)In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 28, no 29, 295501Article in journal (Refereed) PublishedText
Abstract [en]

To examine the effect of neutron transmutation on tungsten as the first wall material of fusion reactors, the elastic properties of W1-x-yRexOsy (0 <= x, y <= 6%) random alloys in body centered cubic (bcc) structure are investigated systematically using the all-electron exact muffin-tin orbitals (EMTO) method in combination with the coherent-potential approximation (CPA). The calculated lattice constant and elastic properties of pure W are consistent with available experiments. Both Os and Re additions reduce the lattice constant and increase the bulk modulus of W, with Os having the stronger effect. The polycrystalline shear modulus, Young's modulus and the Debye temperature increase (decrease) with the addition of Re (Os). Except for C-11, the other elastic parameters including C-12, C-44, Cauchy pressure, Poisson ratio, B/G, increase as a function of Re and Os concentration. The variations of the latter three parameters and the trend in the ratio of cleavage energy to shear modulus for the most dominant slip system indicate that the ductility of the alloy enhances with increasing Re and Os content. The calculated elastic anisotropy of bcc W slightly increases with the concentration of both alloying elements. The estimated melting temperatures of the W-Re-Os alloy suggest that Re or Os addition will reduce the melting temperature of pure W solid. The classical Labusch-Nabarro model for solid-solution hardening predicts larger strengthening effects in W1-yOsy than in W1-xRex. A strong correlation between C' and the fcc-bcc structural energy difference for W1-x-yRexOsy is revealed demonstrating that canonical band structure dictates the alloying effect on C'. The structural energy difference is exploited to estimate the alloying effect on the ideal tensile strength in the [0 0 1] direction.

Place, publisher, year, edition, pages
2016. Vol. 28, no 29, 295501
Keyword [en]
disordered W-Re-Os alloys, elastic properties, ductility, solid-solution hardening
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-299024DOI: 10.1088/0953-8984/28/29/295501ISI: 000377504100007OAI: oai:DiVA.org:uu-299024DiVA: diva2:948870
Funder
Swedish Research CouncilSwedish Foundation for Strategic Research
Available from: 2016-07-14 Created: 2016-07-13 Last updated: 2016-07-14Bibliographically approved

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Johansson, BörjeVitos, Levente
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