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Bonny G, Grigorev P, Terentyev D. On the binding of nanometric hydrogen-helium clusters in tungsten. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:485001. [PMID: 25324475 DOI: 10.1088/0953-8984/26/48/485001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In this work we developed an embedded atom method potential for large scale atomistic simulations in the ternary tungsten-hydrogen-helium (W-H-He) system, focusing on applications in the fusion research domain. Following available ab initio data, the potential reproduces key interactions between H, He and point defects in W and utilizes the most recent potential for matrix W. The potential is applied to assess the thermal stability of various H-He complexes of sizes too large for ab initio techniques. The results show that the dissociation of H-He clusters stabilized by vacancies will occur primarily by emission of hydrogen atoms and then by break-up of V-He complexes, indicating that H-He interaction does influence the release of hydrogen.
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Affiliation(s)
- G Bonny
- SCK• CEN, Nuclear Materials Science Institute, Boeretang 200, B-2400 Mol, Belgium
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Bonny G, Castin N, Bullens J, Bakaev A, Klaver TCP, Terentyev D. On the mobility of vacancy clusters in reduced activation steels: an atomistic study in the Fe-Cr-W model alloy. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2013; 25:315401. [PMID: 23838265 DOI: 10.1088/0953-8984/25/31/315401] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Reduced activation steels are considered as structural materials for future fusion reactors. Besides iron and the main alloying element chromium, these steels contain other minor alloying elements, typically tungsten, vanadium and tantalum. In this work we study the impact of chromium and tungsten, being major alloying elements of ferritic Fe-Cr-W-based steels, on the stability and mobility of vacancy defects, typically formed under irradiation in collision cascades. For this purpose, we perform ab initio calculations, develop a many-body interatomic potential (EAM formalism) for large-scale calculations, validate the potential and apply it using an atomistic kinetic Monte Carlo method to characterize the lifetime and diffusivity of vacancy clusters. To distinguish the role of Cr and W we perform atomistic kinetic Monte Carlo simulations in Fe-Cr, Fe-W and Fe-Cr-W alloys. Within the limitation of transferability of the potentials it is found that both Cr and W enhance the diffusivity of vacancy clusters, while only W strongly reduces their lifetime. The cluster lifetime reduction increases with W concentration and saturates at about 1-2 at.%. The obtained results imply that W acts as an efficient 'breaker' of small migrating vacancy clusters and therefore the short-term annealing process of cascade debris is modified by the presence of W, even in small concentrations.
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Affiliation(s)
- G Bonny
- SCK·CEN, Nuclear Materials Science Institute, Mol, Belgium.
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Ochs T, Elsässer C, Mrovec M, Vitek V, Belak J, Moriarty JA. Symmetrical tilt grain boundaries in bcc transition metals: Comparison of semiempirical with ab-initio total-energy calculations. ACTA ACUST UNITED AC 2009. [DOI: 10.1080/01418610008216481] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- T. Ochs
- a Max-Planck-Institut für Metallforschung , Seestraße 92, D-70174 , Stuttgart , Germany
| | - C. Elsässer
- a Max-Planck-Institut für Metallforschung , Seestraße 92, D-70174 , Stuttgart , Germany
| | - M. Mrovec
- b Department of Materials Science and Engineering , University of Pennsylvania , Philadelphia , Pennsylvania , 19104-6272 , USA
| | - V. Vitek
- b Department of Materials Science and Engineering , University of Pennsylvania , Philadelphia , Pennsylvania , 19104-6272 , USA
| | - J. Belak
- c Lawrence Livermore National Laboratory, Physics Directorate , POB 808, Livermore , California , 94550 , USA
| | - J. A. Moriarty
- c Lawrence Livermore National Laboratory, Physics Directorate , POB 808, Livermore , California , 94550 , USA
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Belonoshko AB, Burakovsky L, Chen SP, Johansson B, Mikhaylushkin AS, Preston DL, Simak SI, Swift DC. Molybdenum at high pressure and temperature: melting from another solid phase. PHYSICAL REVIEW LETTERS 2008; 100:135701. [PMID: 18517968 DOI: 10.1103/physrevlett.100.135701] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2007] [Indexed: 05/26/2023]
Abstract
The Gibbs free energies of bcc and fcc Mo are calculated from first principles in the quasiharmonic approximation in the pressure range from 350 to 850 GPa at room temperatures up to 7500 K. It is found that Mo, stable in the bcc phase at low temperatures, has lower free energy in the fcc structure than in the bcc phase at elevated temperatures. Our density-functional-theory-based molecular dynamics simulations demonstrate that fcc melts at higher than bcc temperatures above 1.5 Mbar. Our calculated melting temperatures and bcc-fcc boundary are consistent with the Mo Hugoniot sound speed measurements. We find that melting occurs at temperatures significantly above the bcc-fcc boundary. This suggests an explanation of the recent diamond anvil cell experiments, which find a phase boundary in the vicinity of our extrapolated bcc-fcc boundary.
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Affiliation(s)
- A B Belonoshko
- Applied Materials Physics, Department of Material Science and Engineering, The Royal Institute of Technology, 10044 Stockholm, Sweden
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Brenner DW, Shenderova OA, Areshkin DA. Quantum-Based Analytic Interatomic Forces and Materials Simulation. REVIEWS IN COMPUTATIONAL CHEMISTRY 2007. [DOI: 10.1002/9780470125892.ch4] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Bacia M, Morillo J, Pénisson JM, Pontikis V. Atomic structure of the ∑ = 5, (210) and (310), [001] tilt axis grain boundaries in Mo: a joint study by computer simulation and high-resolution electron microscopy. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/01418619708200009] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- M. Bacia
- a Département de Recherche Fondamentale sur la Matière Condensée , CEA-Grenoble , 17 rue des Martyrs, F-38054 , Grenoble , Cedex 9 , France
| | - J. Morillo
- b Laboratoire des Solides Irradiés , Unité de Recherche associée au CEA-CNRS URA 1380, Ecole Polytechnique , F-91128 , Palaiseau , Cedex , France
| | - J. M. Pénisson
- a Département de Recherche Fondamentale sur la Matière Condensée , CEA-Grenoble , 17 rue des Martyrs, F-38054 , Grenoble , Cedex 9 , France
| | - V. Pontikis
- b Laboratoire des Solides Irradiés , Unité de Recherche associée au CEA-CNRS URA 1380, Ecole Polytechnique , F-91128 , Palaiseau , Cedex , France
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Dudarev SL. Angular-dependent matrix potentials for fast molecular-dynamics simulations of transition metals. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2006; 18:S447-S461. [PMID: 21690746 DOI: 10.1088/0953-8984/18/16/s06] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The significance of the part played by the angular-dependent components of forces associated with d-d bonding between atoms in a transition metal has long remained a subject of debate. While almost all the large-scale molecular dynamics simulations of collision cascades and radiation damage in transition metals and alloys are currently performed using spherically symmetric many-body potentials, density functional calculations exhibit a highly anisotropic pattern of charge density deformation in and around the core of interstitial atom defects. This paper describes a fast second-order matrix recursion-based algorithm for including effects of angular anisotropy of d-d bonds in a large-scale molecular dynamics simulation.
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Affiliation(s)
- S L Dudarev
- EURATOM/UKAEA Fusion Association, Culham Science Centre, Oxfordshire OX14 3DB, UK
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Belonoshko AB, Simak SI, Kochetov AE, Johansson B, Burakovsky L, Preston DL. High-pressure melting of molybdenum. PHYSICAL REVIEW LETTERS 2004; 92:195701. [PMID: 15169417 DOI: 10.1103/physrevlett.92.195701] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2003] [Indexed: 05/24/2023]
Abstract
The melting curve of the body-centered cubic (bcc) phase of Mo has been determined for a wide pressure range using both direct ab initio molecular dynamics simulations of melting as well as a phenomenological theory of melting. These two methods show very good agreement. The simulations are based on density functional theory within the generalized gradient approximation. Our calculated equation of state of bcc Mo is in excellent agreement with experimental data. However, our melting curve is substantially higher than the one determined in diamond anvil cell experiments up to a pressure of 100 GPa. An explanation is suggested for this discrepancy.
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Affiliation(s)
- A B Belonoshko
- Applied Materials Physics, Department of Material Science and Engineering, The Royal Institute of Technology, 10044 Stockholm, Sweden
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Yang LH, Söderlind P, Moriarty JA. Accurate atomistic simulation of (a/2) 〈111〉 screw dislocations and other defects in bcc tantalum. ACTA ACUST UNITED AC 2001. [DOI: 10.1080/01418610108214446] [Citation(s) in RCA: 85] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Ochs T, Beck O, Elsässer C, Meyer B. Symmetrical tilt grain boundaries in body-centred cubic transition metals: Anab initiolocal-density-functional study. ACTA ACUST UNITED AC 2000. [DOI: 10.1080/01418610008212057] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Girshick A, Bratkovsky AM, Pettifor DG, Vitek V. Atomistic simulation of titanium. I. A bond-order potential. ACTA ACUST UNITED AC 1998. [DOI: 10.1080/01418619808221223] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Xu W, Moriarty JA. Atomistic simulation of ideal shear strength, point defects, and screw dislocations in bcc transition metals: Mo as a prototype. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:6941-6951. [PMID: 9984313 DOI: 10.1103/physrevb.54.6941] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Xu W, Adams JB, Einstein TL. Oscillatory interaction of steps on W{110}. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:2910-2916. [PMID: 9986148 DOI: 10.1103/physrevb.54.2910] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Voter AF, Kress JD, Silver RN. Linear-scaling tight binding from a truncated-moment approach. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:12733-12741. [PMID: 9982944 DOI: 10.1103/physrevb.53.12733] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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17
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On the Role of Non—Pair Potential Terms in Semiempirical Quantum—Mechanical Simulations. ACTA ACUST UNITED AC 1996. [DOI: 10.1007/978-1-4613-0385-5_39] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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18
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Marinopoulos AG, Vitek V, Carlsson AE. Significance of non-central forces in atomistic studies of grain boundaries in bcc transition metals. ACTA ACUST UNITED AC 1995. [DOI: 10.1080/01418619508236257] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Guevara J, Llois AM, Weissmann M. Model potential based on tight-binding total-energy calculations for transition-metal systems. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:11509-11516. [PMID: 9980260 DOI: 10.1103/physrevb.52.11509] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kress JD, Voter AF. Low-order moment expansions to tight binding for interatomic potentials: Successes and failures. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:8766-8775. [PMID: 9979866 DOI: 10.1103/physrevb.52.8766] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Nastar M, Willaime F. Tight-binding calculation of the elastic constants of fcc and hcp transition metals. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:6896-6907. [PMID: 9977243 DOI: 10.1103/physrevb.51.6896] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Blandin P, Massobrio C, Ballone P. Nucleation and growth of metallic submonolayers on compact metal surfaces. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:16637-16648. [PMID: 10010823 DOI: 10.1103/physrevb.49.16637] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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23
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Moriarty JA. Angular forces and melting in bcc transition metals: A case study of molybdenum. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:12431-12445. [PMID: 10010143 DOI: 10.1103/physrevb.49.12431] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Feibelman PJ, Nelson JS, Kellogg GL. Energetics of Pt adsorption on Pt(111). PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:10548-10556. [PMID: 10009880 DOI: 10.1103/physrevb.49.10548] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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25
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Holzwarth NA, Chervenak JA, Kimmer CJ, Zeng Y, Xu W, Adams J. Multilayer-relaxation geometry and electronic structure of a W(111) surface. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:12136-12145. [PMID: 10007564 DOI: 10.1103/physrevb.48.12136] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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