Solidification Analyses of Bulky Zr60Al10Ni10Cu15Pd5 Glass Produced by Casting into Wedge-Shape Copper Mold
- 1 January 1995
- journal article
- Published by Japan Institute of Metals in Materials Transactions, JIM
- Vol. 36 (10) , 1276-1281
- https://doi.org/10.2320/matertrans1989.36.1276
Abstract
The liquid-crystalline transformation behavior during continuous cooling and the transformation-induced structure were examined for a Zr60Al10Ni10Cu15Pd5 molten alloy which was ejected into a wedge-shape cavity in a copper mold. The wedge-shape cavity has a constant depth of 50 mm and different vertical angles (θ) ranging from 5 to 15 degrees. The ejection temperature of the molten alloy was also changed in the range of 1273 to 1573 K. The cast structure consists only of a glassy phase in the θ range smaller than 10 degrees and changes to a mixed structure consisting of glassy and nonequilibrium crystalline Zr2Ni and Zr2Cu phases in the higher θ range. The glass transition temperature and crystallization temperature of the cast metal glass are 683 and 778 K, respectively, which agree with those for the melt-spun glassy ribbon. The start (Cs) and termination (Ct) points for the transformation from the supercooled liquid to crystalline phases during continuous cooling were determined from the thermal analytical data obtained at different sites in the wedge-shape cavity and the continuous-cooling-transformation (C.C.T.) curves were constructed. The nose temperature (Tn) and the time (tn) up to the nose point in the C.C.T. curves were 1018 K and 0.93 s respectively. The critical cooling rate for glass formation defined by (Tm−Tn)⁄tn is evaluated to be 110 K/s. Further, the time interval between Cs and Ct is as short as 0.2 s and the fast growth reaction is attributed to the easy formation of the nonequilibrium crystalline phases and the increase in temperature caused by the precipitation-induced recalescence.Keywords
This publication has 15 references indexed in Scilit:
- Glass-forming ability of alloysPublished by Elsevier ,2003
- Preparation of Bulky Amorphous Zr–Al–Co–Ni–Cu Alloys by Copper Mold Casting and Their Thermal and Mechanical PropertiesMaterials Transactions, JIM, 1995
- Mechanical strength and thermal stability of Ti-based amorphous alloys with large glass-forming abilityMaterials Science and Engineering: A, 1994
- A highly processable metallic glass: Zr41.2Ti13.8Cu12.5Ni10.0Be22.5Applied Physics Letters, 1993
- Cu-Rich Cu–Al–Ln (Ln=Ce or Nd) Amorphous AlloysMaterials Transactions, JIM, 1993
- Zr–Al–Ni Amorphous Alloys with High Glass Transition Temperature and Significant Supercooled Liquid RegionMaterials Transactions, JIM, 1990
- Al–La–Cu Amorphous Alloys with a Wide Supercooled Liquid RegionMaterials Transactions, JIM, 1990
- Al–La–Ni Amorphous Alloys with a Wide Supercooled Liquid RegionMaterials Transactions, JIM, 1989
- Mg–Ni–La Amorphous Alloys with a Wide Supercooled Liquid RegionMaterials Transactions, JIM, 1989
- New Amorphous Mg-Ce-Ni Alloys with High Strength and Good DuctilityJapanese Journal of Applied Physics, 1988