The effect of silicon on the glass forming ability of the Cu{sub 47}Ti{sub 34}Zr{sub 11}Ni{sub 8} bulk metallic glass forming alloy during processing of composites
- W.M. Keck Laboratory of Engineering Materials, 138-78, California Institute of Technology, Pasadena, California 91125 (United States)
Composites of the Cu{sub 47}Ti{sub 34}Zr{sub 11}Ni{sub 8} bulk metallic glass, reinforced with up to 30 volthinsp{percent} SiC particles are synthesized and characterized. Results based on x-ray diffraction, optical microscopy, scanning Auger microscopy, and differential scanning calorimetry (DSC) are presented. During processing of the composites, a TiC layer forms around the SiC particles and Si diffuses into the Cu{sub 47}Ti{sub 34}Zr{sub 11}Ni{sub 8} matrix stabilizing the supercooled liquid against crystallization. The small Si addition between 0.5 and 1 at.thinsp{percent} increases the attainable maximum thickness of glassy ingots from 4 mm for Cu{endash}Ti{endash}Zr{endash}Ni alloys to 7 mm for Cu{endash}Ti{endash}Zr{endash}Ni{endash}Si alloys. DSC analyses show that neither the thermodynamics nor the kinetics of the alloy are affected significantly by the Si addition. This suggests that Si enhances the glass forming ability by chemically passivating impurities such as oxygen and carbon that cause heterogeneous nucleation in the melt. {copyright} {ital 1998 American Institute of Physics.}
- Research Organization:
- California Institute of Technology
- DOE Contract Number:
- FG03-86ER45242
- OSTI ID:
- 634205
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 12 Vol. 83; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AUGER EFFECT
COMPOSITE MATERIALS
COPPER ALLOYS
COPPER BASE ALLOYS
IMPURITIES
MATRIX MATERIALS
MECHANICAL PROPERTIES
METALLIC GLASSES
NICKEL ALLOYS
OPTICAL MICROSCOPY
PASSIVATION
REINFORCED MATERIALS
SCANNING ELECTRON MICROSCOPY
SILICON ADDITIONS
SILICON COMPOUNDS
SYNTHESIS
THERMAL ANALYSIS
TITANIUM ALLOYS
X-RAY DIFFRACTION
ZIRCONIUM ALLOYS