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Obtaining and characterization of Ni-Zr type amorphous tapes

L. BÜKKÖSI1,* , GY. THALMAIER1, C. CODREAN2, P. PĂȘCUȚĂ3, I. VIDA-SIMITI1

Affiliation

  1. Department of Materials Science and Technology, Technical University of Cluj-Napoca, 103-105 Muncii Ave., 400641 Cluj-Napoca, Romania
  2. Mechanical Faculty, Politehnica University of Timisoara, 1 Mihai Viteazu Ave., 300222 Timisoara, Romania
  3. Department of Physics and Chemistry, Technical University of Cluj-Napoca, 103-105 Muncii Ave., 400641 Cluj – Napoca, Romania

Abstract

The NiZr master alloys were prepared by arc melting using high purity metals in a Ti-gettered argon atmosphere. The alloys were melted several times in order to improve homogeneity. The ingots were induction-melted under a high-purity argon atmosphere in a quartz tube and a graphite crucible, injected through a nozzle onto a Cu wheel to produce rapidly solidified amorphous ribbons. The characterization of the amorphous ribbons was done by X-ray diffraction, DSC analysis and tensile tests. The crystallization of amorphous Ni64Zr36 alloy has been studied with the help of non-isothermal scanning experiments in a differential scanning calorimeter. The thermograms at different scanning rates show a two-step crystallization. To determine the activation energy, the methods of Kissinger, Ozawa and Boswell are used starting from the shift of the peaks (Tp) according to the heating rate..

Keywords

Nickel–Zirconium alloys, Rapid solidification, X-ray diffraction, Differential scanning calorimetry.

Citation

L. BÜKKÖSI, GY. THALMAIER, C. CODREAN, P. PĂȘCUȚĂ, I. VIDA-SIMITI, Obtaining and characterization of Ni-Zr type amorphous tapes, Optoelectronics and Advanced Materials - Rapid Communications, 6, 9-10, September-October 2012, pp.814-817 (2012).

Submitted at: June 27, 2012

Accepted at: Sept. 20, 2012