Oxidation and crystallization of Zr-based bulk metallic glass due to machining


Bakkal M., LIU C., WATKINS T., SCATTERGOOD R., SHIH A.

INTERMETALLICS, cilt.12, sa.2, ss.195-204, 2004 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 12 Sayı: 2
  • Basım Tarihi: 2004
  • Doi Numarası: 10.1016/j.intermet.2003.09.017
  • Dergi Adı: INTERMETALLICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.195-204
  • Anahtar Kelimeler: metallic glasses, oxidation, machining, X-ray diffraction, scanning, NANOCRYSTALLINE COMPOSITES, MECHANICAL-PROPERTIES, FRACTURE
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

Bulk metallic glass was subjected to extreme deformation conditions during machining operation. The flash temperature, oxidation and crystallization within chips from a Zr-based bulk metallic glass were investigated. A near-infrared spectrometer was used to capture the light emission from the tool-chip interface allowing the calculation of the temperature. Very high temperatures in the 2400-2700 K range were observed and associated with the light emission and oxidation in the chips. X-ray diffraction analysis revealed oxidation of chips machined at high cutting speeds. Optical micrographs of polished and etched chip cross-sections showed a dendritic pattern due to crystallization. Using a field emission gun SEM, amorphous and crystalline regions were analyzed. This study demonstrates the oxidation and crystallization of bulk metallic glass during machining. (C) 2003 Elsevier Ltd. All rights reserved.