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Metals 2015, 5(2), 1061-1072; doi:10.3390/met5021061

Synergic Role of Self-Interstitials and Vacancies in Indium Melting

Department of Industrial Engineering, University of Rome-Tor Vergata, Via del Politecnico 1 00133, Rome, Italy
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Academic Editor: Nikolaos Michailidis
Received: 21 April 2015 / Accepted: 11 June 2015 / Published: 16 June 2015
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Abstract

Precursor effects of indium melting have been investigated by means of Mechanical Spectroscopy (MS) and High Temperature X-ray Diffraction (HT-XRD). MS tests evidenced a sharp drop of dynamic modulus in the temperature range between 418 K and 429 K (melting point). At 429 K, HT-XRD showed partial grain re-orientation, peak profile broadening, in particular in the lower part, and peak shift towards lower angles. Experimental results are consistent with density increase of self-interstitials and vacancies in the crystal lattice before melting. Self-interstitials and vacancies play a synergic role in the solid–liquid (S-L) transformation. The increase of self-interstitials over a temperature range of about 10 K before melting has the effect of weakening interatomic bonds (modulus drop) that favors the successive vacancy formation. Finally, the huge increase of vacancy concentration above 428 K leads to the collapse of crystal lattice (melting). View Full-Text
Keywords: indium; precursor phenomena of melting; dynamic modulus; high temperature X-Ray diffraction; self-interstitials; vacancy indium; precursor phenomena of melting; dynamic modulus; high temperature X-Ray diffraction; self-interstitials; vacancy
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Montanari, R.; Varone, A. Synergic Role of Self-Interstitials and Vacancies in Indium Melting. Metals 2015, 5, 1061-1072.

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