Acta Metallurgica Sinica (English Letters) ›› 2002, Vol. 15 ›› Issue (2): 160-166 .

• Research Articles • Previous Articles     Next Articles

AMORPHIZATION IN Nb-M (M=Fe, Co, Ni) BINARY METAL SYSTEMS INDUCED BY ION BEAM ASSISTED DEPOSITION (IBAD)

F. Pan, F. Zeng, B. Zhao   

  1. Laboratory of Advanced Materials,Department of Materials and Engineering,Tsinghua University,Beijing 100084,China
  • Received:2001-07-31 Revised:2001-09-25 Online:2002-04-25 Published:2009-10-10
  • Contact: F. Pan

Abstract: Ion beam assisted deposition technique (IBAD) was utilized to systematically studyamorphization in binary metal systems of Nb-magnetic element, i.e., Nb-M (M=Fe,Co or Ni). The glass forming range terned as Nb fraction of Nb-Fe system was about34at.% to 56at.%, that of Nb-Co system was about 32at.% to 72at.% and that of Nb-Ni about 20at.% to 80at.%. Similar percolation patterns were found in amorphousalloy films. The fractal dimensions of the percolation patterns approach to 2, whichindicates 2-D layer growth for amorphous phases. It is regarded that the assistedAr+ ion beam duringthe deposition process plays important role for the 2-D layergrowth. Some metastable crystalline phases were obtained in these three systems byIBAD, e.g., bcc supersaturated solid solutions in Nb-Fe and Nb-Co systems, fcc andhcp phases in Nb-Co and Nb-Ni systems. The formation and competing between theamorphous and the metastable crystalline phases were determined by both the phases'thermodynamic states in binary metal systems and kinetics during IBAD process.

Key words: amorphization, ion beam assisted deposition, glass formingrange, metastable phase