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Title: Nonlinear ultrasonic response of voids and Cu precipitates in body-centered cubic Fe

Abstract

Interpreting nonlinear ultrasonic signals detected in nondestructive evaluation of radiation damage needs the knowledge of the correlation between defects and nonlinearity. In this work, molecular dynamics simulations are performed to study the effect of distributed vacancies, voids, Cu atoms, and Cu precipitates on nonlinear ultrasonic response in body-centered cubic (bcc) Fe. The nonlinearity parameter calculated from the second harmonic amplitude in the perfect lattice is 2.73. Vacancies are found to increase the nonlinearity. Surprisingly, clusters of vacancies in the form of spherical voids show an opposite effect. This finding can be used to conveniently distinguish vacancies from voids in the material. Unlike vacancies, individual Cu atoms decrease the nonlinearity. Clustering of Cu atoms into Cu precipitates further decrease the nonlinearity. Interestingly, precipitates with a diameter of 2 nm and larger exhibit a similar effect despite their different structure and coherency with the Fe matrix.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. BATTELLE (PACIFIC NW LAB)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1591884
Report Number(s):
PNNL-SA-132781
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 124; Journal Issue: 3
Country of Publication:
United States
Language:
English

Citation Formats

Setyawan, Wahyu, Henager, Charles H., and Hu, Shenyang. Nonlinear ultrasonic response of voids and Cu precipitates in body-centered cubic Fe. United States: N. p., 2018. Web. doi:10.1063/1.5029368.
Setyawan, Wahyu, Henager, Charles H., & Hu, Shenyang. Nonlinear ultrasonic response of voids and Cu precipitates in body-centered cubic Fe. United States. doi:10.1063/1.5029368.
Setyawan, Wahyu, Henager, Charles H., and Hu, Shenyang. Sat . "Nonlinear ultrasonic response of voids and Cu precipitates in body-centered cubic Fe". United States. doi:10.1063/1.5029368.
@article{osti_1591884,
title = {Nonlinear ultrasonic response of voids and Cu precipitates in body-centered cubic Fe},
author = {Setyawan, Wahyu and Henager, Charles H. and Hu, Shenyang},
abstractNote = {Interpreting nonlinear ultrasonic signals detected in nondestructive evaluation of radiation damage needs the knowledge of the correlation between defects and nonlinearity. In this work, molecular dynamics simulations are performed to study the effect of distributed vacancies, voids, Cu atoms, and Cu precipitates on nonlinear ultrasonic response in body-centered cubic (bcc) Fe. The nonlinearity parameter calculated from the second harmonic amplitude in the perfect lattice is 2.73. Vacancies are found to increase the nonlinearity. Surprisingly, clusters of vacancies in the form of spherical voids show an opposite effect. This finding can be used to conveniently distinguish vacancies from voids in the material. Unlike vacancies, individual Cu atoms decrease the nonlinearity. Clustering of Cu atoms into Cu precipitates further decrease the nonlinearity. Interestingly, precipitates with a diameter of 2 nm and larger exhibit a similar effect despite their different structure and coherency with the Fe matrix.},
doi = {10.1063/1.5029368},
journal = {Journal of Applied Physics},
number = 3,
volume = 124,
place = {United States},
year = {2018},
month = {7}
}

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