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Title: Effect of alloying elements on defect evolution in Ni-20X binary alloys

The effect of alloying elements on radiation-induced microstructural evolution in Ni and Ni-20X (X = Fe, Cr, Mn and Pd) binary alloys was investigated using ion irradiation and cross-sectional transmission electron microscopy. The three-dimensional migration mode is identified to be the dominating migration mechanism for interstitial clusters in these binary alloys, contrary to the one-dimensional mode that dominates in the well-studied dilute alloys. The results reveal that: (1) the average size of defect clusters decreases as the solute atomic volume size factor increases. Smaller void size in Ni-20Cr is attributed to faster vacancy mobility in the near surface region, and weaker vacancy binding energy beyond the irradiation peak than Ni-20Fe. The smaller voids observed in Ni-20Mn and Ni-20Pd beyond the damage peak are due to the stronger Mn/Pd-vacancy binding effect of largely oversized solute atoms. (2) Oversized solutes can act as strong trapping sites for interstitials. The larger the solute atomic volume factor, the stronger the trapping force. This leads to a more significantly sluggish interstitial migration and smaller dislocation loop size. The average dislocation loop size in Ni-20Fe was four times larger than Ni-20Pd (atomic volume factor being 10.6% and 41.3%) but an order of magnitude lower in density.more » The smaller dislocation loop size in Ni-20Cr is attributed to stronger interstitial binding of Cr-Ni. In conclusion, overall, the alloying effect on defects is more significant in concentrated binary alloys than in dilute binary alloys, due to the concentration difference of alloying atoms and the interstitial dominant migration mechanisms in the main irradiated region.« less
Authors:
 [1] ;  [1] ; ORCiD logo [2] ; ORCiD logo [2] ;  [1] ;  [3] ; ORCiD logo [4] ; ORCiD logo [2] ;  [5]
  1. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Nuclear Engineering and Radiological Sciences
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
  3. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
  5. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Nuclear Engineering and Radiological Sciences; Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Materials Science Engineering
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 151; Journal Issue: C; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Irradiation-induced microstructural evolution; Atomic volume effect; Ni concentrated binary alloys; Defect migration
OSTI Identifier:
1458370

Yang, Tai-ni, Lu, Chenyang, Velisa, Gihan, Jin, Ke, Xiu, Pengyuan, Crespillo, Miguel L., Zhang, Yanwen, Bei, Hongbin, and Wang, Lumin. Effect of alloying elements on defect evolution in Ni-20X binary alloys. United States: N. p., Web. doi:10.1016/j.actamat.2018.03.054.
Yang, Tai-ni, Lu, Chenyang, Velisa, Gihan, Jin, Ke, Xiu, Pengyuan, Crespillo, Miguel L., Zhang, Yanwen, Bei, Hongbin, & Wang, Lumin. Effect of alloying elements on defect evolution in Ni-20X binary alloys. United States. doi:10.1016/j.actamat.2018.03.054.
Yang, Tai-ni, Lu, Chenyang, Velisa, Gihan, Jin, Ke, Xiu, Pengyuan, Crespillo, Miguel L., Zhang, Yanwen, Bei, Hongbin, and Wang, Lumin. 2018. "Effect of alloying elements on defect evolution in Ni-20X binary alloys". United States. doi:10.1016/j.actamat.2018.03.054. https://www.osti.gov/servlets/purl/1458370.
@article{osti_1458370,
title = {Effect of alloying elements on defect evolution in Ni-20X binary alloys},
author = {Yang, Tai-ni and Lu, Chenyang and Velisa, Gihan and Jin, Ke and Xiu, Pengyuan and Crespillo, Miguel L. and Zhang, Yanwen and Bei, Hongbin and Wang, Lumin},
abstractNote = {The effect of alloying elements on radiation-induced microstructural evolution in Ni and Ni-20X (X = Fe, Cr, Mn and Pd) binary alloys was investigated using ion irradiation and cross-sectional transmission electron microscopy. The three-dimensional migration mode is identified to be the dominating migration mechanism for interstitial clusters in these binary alloys, contrary to the one-dimensional mode that dominates in the well-studied dilute alloys. The results reveal that: (1) the average size of defect clusters decreases as the solute atomic volume size factor increases. Smaller void size in Ni-20Cr is attributed to faster vacancy mobility in the near surface region, and weaker vacancy binding energy beyond the irradiation peak than Ni-20Fe. The smaller voids observed in Ni-20Mn and Ni-20Pd beyond the damage peak are due to the stronger Mn/Pd-vacancy binding effect of largely oversized solute atoms. (2) Oversized solutes can act as strong trapping sites for interstitials. The larger the solute atomic volume factor, the stronger the trapping force. This leads to a more significantly sluggish interstitial migration and smaller dislocation loop size. The average dislocation loop size in Ni-20Fe was four times larger than Ni-20Pd (atomic volume factor being 10.6% and 41.3%) but an order of magnitude lower in density. The smaller dislocation loop size in Ni-20Cr is attributed to stronger interstitial binding of Cr-Ni. In conclusion, overall, the alloying effect on defects is more significant in concentrated binary alloys than in dilute binary alloys, due to the concentration difference of alloying atoms and the interstitial dominant migration mechanisms in the main irradiated region.},
doi = {10.1016/j.actamat.2018.03.054},
journal = {Acta Materialia},
number = C,
volume = 151,
place = {United States},
year = {2018},
month = {4}
}