Crystallization of an amorphous Cu60Ti40 alloy prepared by planar magnetron sputtering

✍ Scribed by A.F. Marshall; Y.S. Lee; D.A. Stevenson

• Publisher: Elsevier Science
• Year: 1983
• Weight: 967 KB
• Volume: 31
• Category: Article
• ISSN: 0001-6160
• DOI: 10.1016/0001-6160(83)90184-0

✦ Synopsis

The crystallization path of an amorphous Cu,Ti, alloy was studied using diKerential scanning calorimetry (DSC), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The samples were Cu-Ti films s IOprn in thickness prepared by magnetron sputter deposition onto rotating glass substrates. Two exothermic peaks were observed at 418" and 433% respectively, with no evidence of a glass transition. observations from TEM and XRD at various sta8es of isochronal ~talli~tion indicate that the initial amorphous structure transforms first to a metastable microcrystalline b.c.c. structure prior to formation of the ordered equilibrium CurTi, crystalline phase. The intermediate metastable structure is initially favored since it requires only topological ordering of the atoms into a simple unit cell, without significant diffusion, whereas the final ordered structure requires atom rearrangement over longer distances. The contrast of this sequence of events to that of a similar Cu-Zr alloy is discussed. Analysis of the fully crystallixed alloy by convergent beam direction is consistent with a P4/nmm space group far the equilibrium phase.