Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 3

Nanocrystallization of NiNb(ZrTi)Al metallic glasses

Tomasz Czeppe

nr katalogowy: 52767

Bulk metallic glasses (BMG) are new class of engineering oriented materials [1]. Different compositions of Ni based Nb containing amorphous alloys like: NiNbTi, NiNbZr, NiNbTiZr, NiNbZrTiAl, NiNbTiZrCoCu, NiZrNbHfAl, NiZrTaNb, reveals high glass forming ability (GFA), high fracture strength and good corrosion resistance [2÷7]. Due to the small difference between heat of mixing of Nb and Zr and Ti, Ni based Nb containing glassy alloys may reveal good ductility [6]. A very uncommon, composition dependent property is high thermal stability of the amorphous phase in alloys containing Hf and Ta or Al [7, 8]. In the following paper the melt spun ribbons of composition Ni58Nbx(ZrTi)1-xAly, (x = 5, 10, 20, 25 at. %, y = 3, 7 at. %), were investigated. The alloys were studied from the point of view of the microstructure, crystallization mechanism, phase composition after crystallization and crystallization kinetics during continuous heating. The most often applied are methods of the determination of the kinetics parameters basing on the assumption of the constant transformation rate at the peak temperature in the DSC experiments, when at least three different heating rates must be used. These methods base on the Kissinger [9] and Ozawa [10] equations and let to determine activation energy of crystallization. Last time however also the Matusita [11, 12] method, basing on the transformation rate for one heating rate is quite often presented in papers. The method was originally invented and verified for the oxide glasses, while the crystallization process is much slower than in the case of metallic glasses. The method lets to verify if the activation energy is constant during the transformation as well as determine m parameter connected to the crystals growth dimensions. In the following paper the Matusita method was applied to determine the activation energy in case of the lower crystallization rate observed in amorphous alloys containin[...]

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