The effect of Zr addition on glass forming ability (GFA) of Ni-Nb alloys has been investigated. Ni60Nb40-xZrx (x = 0-40) alloys were prepared by melt-spinning and injection-casting. Crystallization behavior of the alloys was studied by differential scanning calorimetry (DSC), differential thermal analyzer (DTA) and X-ray diffractometry (XRD). The GFA increased with the addition of Zr, thus, a rod with the diameter of 2 mm was obtained in Ni60Nb30Zr10 which has the highest reduced glass transition Trg value of 0.619 among the alloys investigated. When Zr content is more than 10 at.%, the GFA deteriorated significantly. The atomic structure of Ni-Nb-Zr alloys investigated by means of extended X-ray absorption fine structure (EXAFS), indicated presence of chemical inhomogeneity in the amorphous structure due to the positive mixing enthalpy between Zr and Nb.
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry