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Glass forming ability of Fe(Co)TiZr alloys

Grant number: 09/00568-1
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Effective date (Start): April 01, 2009
Effective date (End): October 31, 2009
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Transformation Metallurgy
Principal Investigator:Claudemiro Bolfarini
Grantee:João Paulo Ferreira Santos
Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
Associated research grant:05/59594-0 - Properties of amorphous, metastable and nano-structured metallic alloys, AP.TEM


Several Fe-, Ti-, Cu- and Zr-based Alloys present good glass forming ability_GFA, BMGs,and can show values of yield stress above 1800MPa. Notwithstanding the interest caused by such values, there is still a lack of a criterion for choosing the best compositions leading to good glass forming ability and the progress in such area will depend on the in-depth understanding of the formation mechanism of amorphous phase and improvement of the preparation techniques. Many efforts have been done in recent years toward the development of a tool to predict compositions with high GFA in multicomponent metallic systems. In this work we proposed a Fe-based composition based in the topological instability, » criterion, and in the electronegativity criterion, recently developed by our research group at UFSCar. The main goal is to verify the glass forming ability of this alloy. The alloy will be fabricated in an arc melt furnace and then rapid solidified in a melt-spinning apparatus to produce ribbons or cast into cylindrical copper mold. Characterization of the alloys will be carried out by X-ray diffraction (XRD), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). The results will be discussed considering the thermal properties of the alloys, especially the Tg: Glass transition temperature, Tm: eutectic temperature, Trg: reduced transition glass temperature, and related Glass forming ability when compared with good glass former alloys reported in the literature.

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