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Electromagnetic vibration process for producing bulk metallic glasses.
Takuya Tamura1, Kenji Amiya, Rudi S Rachmat
1Solidification Processing Group, Materials Research Institute for Sustainable Development, National Institute of Advanced Industrial Science and Technology, Nagoya 463-8560, Japan. takuya-tamura@aist.go.jp
Nature Materials
|March 8, 2005
Summary
Electromagnetic vibrations enhance bulk metallic glass production by suppressing crystal nucleation. This novel method improves glass-forming ability in alloys like Mg65-Cu25-Y10, enabling larger metallic glass formation.
Area of Science:
- Materials Science
- Condensed Matter Physics
Background:
- Cooling rate is critical for bulk metallic glass (BMG) production.
- Influence of electric and magnetic fields on BMG formation is under-investigated.
Purpose of the Study:
- To introduce a new method for producing bulk metallic glasses using electromagnetic vibrations.
- To investigate the impact of simultaneous alternating electric current and magnetic field on glass-forming ability.
Main Methods:
- Employing electromagnetic vibrations on liquid Mg65-Cu25-Y10 (atomic percent) alloy.
- Simultaneously imposing an alternating electric current and a magnetic field during cooling.
Main Results:
- Enhanced apparent glass-forming ability was observed in Mg65-Cu25-Y10 alloys.
- Larger bulk metallic glasses were successfully produced under identical cooling conditions compared to conventional methods.
- The electromagnetic vibration process is presumed to suppress crystal nucleation by reducing or eliminating clusters in the liquid state.
Conclusions:
- The novel electromagnetic vibration method effectively enhances bulk metallic glass production.
- This technique shows promise for other bulk metallic glass systems where liquid-state clusters contribute to crystal nucleation.