|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIII
||Role of Niobium Concentration on Glass Forming Ability and Crystallization Behavior of Zr-Ni-Al-Cu-Nb Bulk Metallic Glasses with Low Cu Concentration
||Kevin Cole, Donald W. Kirk, Chandra Veer Singh, Steven J. Thorpe
|On-Site Speaker (Planned)
An in-depth investigation of the crystallization behavior and glass forming ability as a function of Nb concentration in Zr-Ni-Al-Cu-Nb bulk metallic glasses of low Cu concentration was achieved through a combination of x-ray diffraction, differential scanning calorimetry, scanning electron microscopy and energy dispersive x-ray spectroscopy. The investigation quantified the supercooled liquid region, and the enthalpy of crystallization for these alloys. The activation energy for crystallization was computed from Kissinger, Ozawa and Cheng’s methods based on non-isothermal differential scanning calorimetry data. A comparison of the activation energy models revealed similarities in the results obtained through Kissinger and Ozawa methods while Cheng’s method produced varied results for samples partially crystallized upon casting. The results of these tests defined different crystallization pathways as a function of composition and a high glass forming range between 2 and 4 at. % Nb, with the ideal composition being at 2.7 at.% Nb.
||Planned: A print-only volume