Study of clusters structures in glass metal compositions determined by a selection criteria based on topology and thermodynamics

• Grant number: 11/13221-0
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: November 01, 2011
• End date: October 31, 2015
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
• Principal Investigator: Marcelo Falcão de Oliveira
• Grantee: Leonardo Pratavieira Deo
• Host Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
• Associated scholarship(s): 13/18950-5 - Study of clusters in metallic glasses, BE.EP.DR

Abstract

Models for efficient packing of clusters, as proposed by Miracle, describe with some efficiency the structures found in metallic glasses. Such models are able to predict compositions with glass forming ability (GFA), however some compositions are not close to those observed experimentally. Generally considerations that take into account the structural defects of the clusters help to make the better relations between the models proposed and experimentally observed results. In this context, this doctoral project has as one of its goals the GFAs comparison of the alloys calculated by the criterion that combines the topological parameter of instability (»mín) and thermodynamic parameters (”h) with GFAs alloys determined by these same models efficient packing of clusters, as proposed by Miracle.Subsequently the structures of metal clusters present in the samples studied are made in order to be compared with those of existing theoretical models. The radial distribution function and electron microscopy of high resolution transmission will be the main tools for this study. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

DEO, LEONARDO PRATAVIEIRA; DE OLIVEIRA, MARCELO FAICAO. Metastable phases found in the Ni-Nb-Zr system. MATERIALS CHARACTERIZATION, v. 127, p. 60-63, MAY 2017. (13/18950-5, 11/13221-0)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

DEO, Leonardo Pratavieira. Glass forming ability, crystalline phases rapidly quenched and minor addition effect of Y or Er in the Ni-Nb-Zr ternary system. 2015. Doctoral Thesis - Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD) São Carlos.