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Saidi P, Changizian P, Nicholson E, Zhang HK, Luo Y, Yao Z, Singh CV, Daymond MR, Béland LK. Effect of He on the Order-Disorder Transition in Ni_{3}Al under Irradiation. PHYSICAL REVIEW LETTERS 2020; 124:075901. [PMID: 32142353 DOI: 10.1103/physrevlett.124.075901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Revised: 12/09/2019] [Accepted: 01/15/2020] [Indexed: 06/10/2023]
Abstract
The order-disorder transition in Ni-Al alloys under irradiation represents an interplay between various reordering processes and disordering due to thermal spikes generated by incident high energy particles. Typically, ordering is enabled by diffusion of thermally generated vacancies, and can only take place at temperatures where they are mobile and in sufficiently high concentration. Here, in situ transmission electron micrographs reveal that the presence of He-usually considered to be a deleterious immiscible atom in this material-promotes reordering in Ni_{3}Al at temperatures where vacancies are not effective ordering agents. A rate-theory model is presented, that quantitatively explains this behavior, based on parameters extracted from atomistic simulations. These calculations show that the V_{2}He complex is an effective agent through its high stability and mobility. It is surmised that immiscible atoms may stabilize reordering agents in other materials undergoing driven processes, and preserve ordered phases at temperature where the driven processes would otherwise lead to disorder.
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Affiliation(s)
- Peyman Saidi
- Department of Mechanical and Materials Engineering, Queen's University, Kingston, Ontario K7L 2V9, Canada
| | - Pooyan Changizian
- Department of Mechanical and Materials Engineering, Queen's University, Kingston, Ontario K7L 2V9, Canada
| | - Eric Nicholson
- Department of Materials Science and Engineering, University of Toronto, Toronto, Ontario M5S 3E4, Canada
| | - He Ken Zhang
- Department of Mechanical and Materials Engineering, Queen's University, Kingston, Ontario K7L 2V9, Canada
| | - Yu Luo
- Department of Mechanical and Materials Engineering, Queen's University, Kingston, Ontario K7L 2V9, Canada
| | - Zhongwen Yao
- Department of Mechanical and Materials Engineering, Queen's University, Kingston, Ontario K7L 2V9, Canada
| | - Chandra Veer Singh
- Department of Materials Science and Engineering, University of Toronto, Toronto, Ontario M5S 3E4, Canada
| | - Mark R Daymond
- Department of Mechanical and Materials Engineering, Queen's University, Kingston, Ontario K7L 2V9, Canada
| | - Laurent Karim Béland
- Department of Mechanical and Materials Engineering, Queen's University, Kingston, Ontario K7L 2V9, Canada
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Spaczér M, Caro A, Victoria M. Evidence of amorphization in molecular-dynamics simulations on irradiated intermetallic NiAl. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:7171-7178. [PMID: 9979659 DOI: 10.1103/physrevb.52.7171] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kapinos VG, Bacon DJ. Model for vacancy-loop nucleation in displacement cascades. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:4029-4043. [PMID: 9981529 DOI: 10.1103/physrevb.52.4029] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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