Metals | |
Synergic Role of Self-Interstitials and Vacancies in Indium Melting | |
Roberto Montanari1  Alessandra Varone2  | |
[1] Department of Industrial Engineering, University of Rome-Tor Vergata, Via del Politecnico 1 00133, Rome, Italy; E-Mail | |
关键词: indium; precursor phenomena of melting; dynamic modulus; high temperature X-Ray diffraction; self-interstitials; vacancy; | |
DOI : 10.3390/met5021061 | |
来源: mdpi | |
【 摘 要 】
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).
【 授权许可】
CC BY
© 2015 by the authors; licensee MDPI, Basel, Switzerland.
【 预 览 】
Files | Size | Format | View |
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RO202003190010694ZK.pdf | 846KB | download |