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Multi-component metallic alloys of extreme hardness - DIAMOY

Grant number: 20/09736-3
Support type:Research Grants - Innovative Research in Small Business - PIPE
Duration: May 01, 2021 - March 31, 2022
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
Principal researcher:Thomaz Augusto Guisard Restivo
Grantee:Thomaz Augusto Guisard Restivo
Company:Protolab Laboratório de Propriedades Termofísicas e Prototipação Ltda
CNAE: Pesquisa e desenvolvimento experimental em ciências físicas e naturais
City: Sorocaba
Assoc. researchers: Daniel Leal Bayerlein ; Denicezar Angelo Baldo ; José Martins de Oliveira Junior ; Norberto Aranha ; Rossana Cristina Rossoni Figueira
Associated scholarship(s):21/06109-0 - Multi-component metallic alloys of extreme hardness, BP.TT

Abstract

The project aims to consolidate a new crystalline metallic material developed by the main researcher: DIAMOY multi-component metallic alloys. The alloys developed in the laboratory reach the highest hardness values known to mankind: 1420 HV for as-cast and 2500 HV when treated by thermochemical techniques (HV - Vickers hardness in kgf / mm2). Despite the fact that such hardness surpasses very hard ceramic oxides, such as sapphire, approaching to covalent ceramics (carbides and nitrides), the alloys show reasonable fracture toughness, in the range of 8 to 20 MPa.m1/2.Diamoy alloys are made from various elements through an alloy design by occupying the lattice of a body centered cubic crystalline structure (BCC). From the project, 4 or more elements are selected from elements who normally crystallize into BCC structures, or other ones which favor this structure. The alloys are formulated with high content of each element, with atomic fractions from 5% to 35%. The material is made by arc fusion, plasma or induction melting from the mixed metallic powders of the components. The methodology to be used in Phase 1 will employ a plasma laboratory furnace for alloy melting and casting, thermochemical treatments homogenization followed by physical-chemical and mechanical characterization of the samples. Previous results demonstrate that a new class of metal alloys has been obtained that reveals the "Holy Grail" of metallurgy: increased strength / hardness without reducing toughness / ductility. The potential applications of Diamoy alloys are vast, with direct use in the replacement of cermets such as carbide (widia) in tools and dies, currently used in industry. The proposed project should consolidate the results and prepare selected alloys to be offer to the market, either in the form of ingots or other consolidated product, or in the form of alloy powders for application in sintering and additive manufacturing by laser printing. It is expected to revolutionize the sector of special metal alloys and generate new opportunities in terms of products and applications. (AU)

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