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Production of amorphous alloys and bulk metallic glasses for special Apllications

Grant number: 11/21135-6
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): December 01, 2011
Effective date (End): August 31, 2013
Field of knowledge:Engineering - Materials and Metallurgical Engineering
Principal Investigator:Conrado Ramos Moreira Afonso
Grantee:Felipe Dantas Barbosa
Home 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

Abstract

Since it discovery, in 1960, of the possibility of amorphous structure formation in metallic alloys through rapid cooling (about 106 K/s) from the liquid metal, this new material "AMORPHOUS METAL" has been received a special attention from the researchers around the world. After 1972 various Fe-based and Co-based alloys with amorphous structure, which magnetic properties are superior to that of convencional materials, has been applied to power transformer cores, recording heads, sensors, etc. The great barrier to amplify the use and application of these alloys, for example the exploration of its excelent mechanical properties and corrosion resistance is in the develoment of processes and compositions that would allow the production of bulk pieces (milimiter scale), and maintainning the amorphous structure that provide inovative properties. The group of Amorphous and Nanostructured Metals of DEMa-UFSCar have been developing semi-empiric criteria that, when combined (for example, a criteria based in the topology and other based in the thermodinamics), show as a very efficient tool in the discovery of new alloy compositions with good glass forming ability (GFA). Specifically, this study propose the development of new Ti-based alloys and Cu-Zr alloys with good GFA with the strategy of apply a combination of criteria developed by our own research group of DEMa-UFSCar for the Ti-Cu-Si and Cu-Zr systems and the processing of new compositions for special applications. The objective of this project is produce new amorphous metallic alloys of Ti-based and Cu-Zr systems with good GFA for evaporation with the aim of produce thin films of nanometric thickness for specific applications, such as phase plates for the Ti-Cu-Si alloy and to provide the realization of an in-situ tensile test in a metallic glass nanowire through high resolution transmission electron microscopy (HRTEM) with the Cu-Zr alloy.