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Quantitative determination of anti-structured defects applied to alloys of a wide chemical range |
Jing Zhang(张静), Zheng Chen(陈铮), Yongxin Wang(王永欣), Yanli Lu(卢艳丽) |
School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China |
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Abstract Anti-structured defects bridge atom migration among heterogeneous sublattices facilitating diffusion but could also result in the collapse of ordered structure. Component distribution Ni75 AlxV25-x alloys are investigated using a microscopic phase field model to illuminate relations between anti-structured defects and composition, precipitate order, precipitate type, and phase stability. The Ni75 AlxV25-x alloys undergo single Ni3 V (stage I), dual Ni3 Al and Ni3 V (stage Ⅱ with Ni3 V prior; and stage Ⅲ with Ni3 Al prior), and single Ni3 Al (stage IV) with enhanced aluminum level. For Ni3 V phase, anti-structured defects (VNi1, NiV, except VNi2) and substitution defects (AlNi1, AlNi2, AlV) exhibit a positive correlation to aluminum in stage I, the positive trend becomes to negative correlation or smooth during stage Ⅱ. For Ni3 Al phase, anti-structured defects (AlNi, NiAl) and substitution defects (VNi, VAl) have a positive correlation to aluminum in stage Ⅱ, but NiAl goes down since stage Ⅲ and lasts to stage IV. VNi and VAl fluctuate when Ni3 Al precipitates prior, but go down drastically in stage IV. Precipitate type conversion of single Ni3 V/dual (Ni3 V+Ni3 Al) affects Ni3 V defects, while dual (Ni3 V+Ni3 Al)/single Ni3 Al has little effect on Ni3 Al defects. Precipitate order swap occurred in the dual phase region affects on Ni3 Al defects but not on Ni3 V.
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Received: 15 June 2016
Revised: 10 July 2016
Accepted manuscript online:
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PACS:
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61.72.J-
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(Point defects and defect clusters)
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61.50.Ah
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(Theory of crystal structure, crystal symmetry; calculations and modeling)
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81.30.Mh
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(Solid-phase precipitation)
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71.15.Pd
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(Molecular dynamics calculations (Car-Parrinello) and other numerical simulations)
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Fund: Project supported by the Natural Science Basic Research Plan in Shaanxi Province of China (Grant No. 2016JQ5014), the Fundamental Research Funds for the Central Universities, China (Grant No. 3102014JCQ01024), the Research Fund of the State Key Laboratory of Solidification Processing (NWPU), China (Grant No. 114-QP-2014), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20136102120021), and the National Natural Science Foundation of China (Grant Nos. 51474716 and 51475378). |
Corresponding Authors:
Jing Zhang
E-mail: Jingzhang@nwpu.edu.cn
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Cite this article:
Jing Zhang(张静), Zheng Chen(陈铮), Yongxin Wang(王永欣), Yanli Lu(卢艳丽) Quantitative determination of anti-structured defects applied to alloys of a wide chemical range 2016 Chin. Phys. B 25 116102
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