Chinese National Science FoundationNational Natural Science Foundation of China (NSFC) [11504110]

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Chinese National Science FoundationNational Natural Science Foundation of China (NSFC) [11504110]

Authors

Publications

Step-controlled Brownian motion of nanosized liquid Pb inclusions in a solid Al matrix

Radetić, Tamara; Johnson, E.; Olmsted, D. L.; Yang, Yang; Laird, B. B.; Asta, M.; Dahmen, U.

(Pergamon-Elsevier Science Ltd, Oxford, 2017)

TY  - JOUR
AU  - Radetić, Tamara
AU  - Johnson, E.
AU  - Olmsted, D. L.
AU  - Yang, Yang
AU  - Laird, B. B.
AU  - Asta, M.
AU  - Dahmen, U.
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3618
AB  - We have made direct observations of the Brownian motion of individual nanosized liquid lead inclusions in solid aluminum by in-situ transmission electron microscopy. The process was found to depend strongly on the size of the inclusion and the anisotropy of the interfacial energy. The rate controlling mechanism was the nucleation of steps on facets of the equilibrium shape and the diffusion of Al along the liquid-solid interface. Because the Al-Pb interface undergoes a roughening transition at T-r approximate to 820 K, the step nucleation barrier decreases with increasing temperature and vanishes completely at Tr. By including the temperature dependence explicitly, we demonstrate that the contribution of the step energy to an Arrhenius plot of the data has a slope greater than the actual activation energy at temperature T by a factor T-r/(T-r-T). In addition, we show that the diffusion barrier for interfacial transport makes a substantial contribution. Our analysis reconciles a large discrepancy between activation energies obtained from the temperature and size dependences of the process and solves the apparent paradox posed by the observation that some particles are frozen in non-equilibrium shapes while nearby smaller particles are sufficiently mobile to undergo rapid Brownian motion.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Acta Materialia
T1  - Step-controlled Brownian motion of nanosized liquid Pb inclusions in a solid Al matrix
EP  - 433
SP  - 427
VL  - 141
DO  - 10.1016/j.actamat.2017.09.040
ER  - 
@article{
author = "Radetić, Tamara and Johnson, E. and Olmsted, D. L. and Yang, Yang and Laird, B. B. and Asta, M. and Dahmen, U.",
year = "2017",
abstract = "We have made direct observations of the Brownian motion of individual nanosized liquid lead inclusions in solid aluminum by in-situ transmission electron microscopy. The process was found to depend strongly on the size of the inclusion and the anisotropy of the interfacial energy. The rate controlling mechanism was the nucleation of steps on facets of the equilibrium shape and the diffusion of Al along the liquid-solid interface. Because the Al-Pb interface undergoes a roughening transition at T-r approximate to 820 K, the step nucleation barrier decreases with increasing temperature and vanishes completely at Tr. By including the temperature dependence explicitly, we demonstrate that the contribution of the step energy to an Arrhenius plot of the data has a slope greater than the actual activation energy at temperature T by a factor T-r/(T-r-T). In addition, we show that the diffusion barrier for interfacial transport makes a substantial contribution. Our analysis reconciles a large discrepancy between activation energies obtained from the temperature and size dependences of the process and solves the apparent paradox posed by the observation that some particles are frozen in non-equilibrium shapes while nearby smaller particles are sufficiently mobile to undergo rapid Brownian motion.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Acta Materialia",
title = "Step-controlled Brownian motion of nanosized liquid Pb inclusions in a solid Al matrix",
pages = "433-427",
volume = "141",
doi = "10.1016/j.actamat.2017.09.040"
}
Radetić, T., Johnson, E., Olmsted, D. L., Yang, Y., Laird, B. B., Asta, M.,& Dahmen, U.. (2017). Step-controlled Brownian motion of nanosized liquid Pb inclusions in a solid Al matrix. in Acta Materialia
Pergamon-Elsevier Science Ltd, Oxford., 141, 427-433.
https://doi.org/10.1016/j.actamat.2017.09.040
Radetić T, Johnson E, Olmsted DL, Yang Y, Laird BB, Asta M, Dahmen U. Step-controlled Brownian motion of nanosized liquid Pb inclusions in a solid Al matrix. in Acta Materialia. 2017;141:427-433.
doi:10.1016/j.actamat.2017.09.040 .
Radetić, Tamara, Johnson, E., Olmsted, D. L., Yang, Yang, Laird, B. B., Asta, M., Dahmen, U., "Step-controlled Brownian motion of nanosized liquid Pb inclusions in a solid Al matrix" in Acta Materialia, 141 (2017):427-433,
https://doi.org/10.1016/j.actamat.2017.09.040 . .
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