Special Issue "Advances in Bulk Metallic Glasses"
Deadline for manuscript submissions: closed (31 October 2011)
Prof. Dr. Alain R. Yavari
Euronano-SIMaP, Institut Polytechnique de Grenoble (INPG), 1130 rue de la Piscine, BP 75, 38402 Saint-Martin-d'Hères, France
Dr. Konstantinos Georgarakis
WPI-AIMR, Tohoku University, Japan; Euronano-SIMaP-INP Grenoble, 1130 rue de la Piscine, BP 75, 38402 Saint-Martin-d'Hères, France
Bulk metallic glasses (BMGs) are currently on the cutting edge of Materials Science research. Easy bulk glass forming alloys are usually multicomponent eutectic or near eutectic liquid compositions with high viscosities and depressed melting temperatures that result in reduced critical cooling rates required for suppression of crystal formation.
For about two decades after the discovery of the first glassy alloy quenched from the liquid in 1960, the critical cooling rate for suppression of crystallisation was extremely high (of the order of 106 K/s), limiting the sample dimensions to less than 100 μm and restricting applications to a few areas such as magnetic devices and sensors. In the 80’s, an improvement of the maximum size of glassy specimens had been achieved for few alloys using fluxing techniques, bringing down the critical cooling rates to about 104K/s. However, the trend changed in the early 90’s and bulk metallic glasses emerged as an important and promising new class of materials. Since then, a large number of bulk alloys has been quenched to a glassy state with thickness reaching several centimeters and critical cooling rates sometimes as low as 1 K/s. This dramatic improvement in the glass formability was related to alloys having three main features, i.e. multi-component systems, significant atomic size ratios above 12% between their components and negative heats of mixing.
The disordered atomic structure of bulk metallic glasses results in various remarkable properties, such as high mechanical strength up to 5 GPa, elasticity up to 2% strain, good corrosion and wear resistance and excellent soft magnetic properties. The combination of their unique properties with their good formability through viscous flow in the supercooled liquid state, and their near-net-shape casting ability has led to several new applications including reinforcement for high-performance sports equipment, micromotors, springs, armor devices, biomedical implants and ornaments. However, the field of bulk metallic glasses is believed to possess high potential for further development.
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- supercooled liquids
- amorphous metals
- glass-forming ability
- liquid alloys
- rapid quenching
- copper mold casting
- critical cooling rate
- glass transition
- eutectic alloys
Int. J. Mol. Sci. 2011, 12(4), 2275-2293; doi:10.3390/ijms12042275
Received: 1 November 2010; in revised form: 2 December 2010 / Accepted: 6 December 2010 / Published: 4 April 2011| Download PDF Full-text (547 KB) | Download XML Full-text
Article: The Effect of Hydrogen Content on Ballistic Transport Behaviors in the Ni-Nb-Zr-H Glassy Alloys
Int. J. Mol. Sci. 2012, 13(1), 180-186; doi:10.3390/ijms13010180
Received: 9 October 2011; in revised form: 6 December 2011 / Accepted: 14 December 2011 / Published: 23 December 2011| Download PDF Full-text (435 KB) | Download XML Full-text
Last update: 20 January 2012