Crystallization of Ti₃₃Cu₆₇metallic glass under high-current density electrical pulses

• Main Authors: Mali Vyacheslav, Anisimov Alexander, Georgarakis Konstantinos, Yavari Alain, Neklyudova Maria, Dudina Dina, Lomovsky Oleg, Korchagin Michail, Bulina Natalia
• Format: Article
• Language: English
• Published: SpringerOpen 2011-01-01
• Series: Nanoscale Research Letters
• Online Access: http://www.nanoscalereslett.com/content/6/1/512
• ISSN: 1931-7573; 1556-276X

<p>Abstract</p> <p>We have studied the phase and structure evolution of the Ti₃₃Cu₆₇amorphous alloy subjected to electrical pulses of high current density. By varying the pulse parameters, different stages of crystallization could be observed in the samples. Partial polymorphic nanocrystallization resulting in the formation of 5- to 8-nm crystallites of the TiCu₂intermetallic in the residual amorphous matrix occurred when the maximum current density reached 9.7&#183;10⁸A m^-2and the pulse duration was 140 &#956;s, though the calculated temperature increase due to Joule heating was not enough to reach the crystallization temperature of the alloy. Samples subjected to higher current densities and higher values of the evolved Joule heat per unit mass fully crystallized and contained the Ti₂Cu₃and TiCu₃phases. A common feature of the crystallized ribbons was their non-uniform microstructure with regions that experienced local melting and rapid solidification.</p> <p> <b>PACS: </b>81; 81.05.Bx; 81.05.Kf.</p>