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INVESTIGATION ON WELDING OF HIGH ENTROPY ALLOYS IN SIMILAR AND DISSIMILAR COMBINATIONS
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Resumo(s)
O conceito de ligas de alta entropia tem a capacidade de revolucionar a produção de
aplicações de engenharia ao fornecer novos métodos para o desenvolvimento de ligas metá-
licas. Tal é possível através da possibilidade de gerar novas composições capazes de garantir
às ligas propriedades específicas com foco nos requisitos de um dado produto/estrutura.
No entanto, é necessário gerar conhecimento referente ao processamento destas li-
gas, uma vez que não só estarão expostas às condições operacionais de uma determinada
finalidade, mas também às condições impostas por todas as etapas de fabrico necessárias ao
desenvolvimento de um produto.
É desta forma, que os processos de soldadura por fusão se apresentam como métodos
promissores para o desenvolvimento de ligas de alta entropia, uma vez que envolvem a expo-
sição destes materiais a altas temperaturas, capazes de alterar massivamente a sua microes-
trutura e, como tal, a suas propriedades. Pressupondo, assim, explorar a relação entre o pro-
cessamento, microestrutura e propriedades destas ligas avançadas.
Deste modo, o presente trabalho foca-se no estudo de juntas soldadas em ligas de alta
entropia bem conhecidas na literatura, nomeadamente nos sistemas CoCrFeMnNi, AlCoCr-
FeNi, FeMnCoCr, FeCuCoMnNi e CoCrNiAlTi. Esta investigação é posta em prática por forma a
investigar a viabilidade destes materiais avançados em aplicações de engenharia e enfrentar
quaisquer desafios que possam ocorrer durante a sua produção.
By providing new ways of discovering new alloy compositions, the high entropy alloy concept has the ability to revolutionize the way engineering applications are produced. Such is possible by developing materials based on the requirements of a determined purpose, that is, with specific properties in visage. Nevertheless, it is necessary to generate knowledge regarding the processability of such novel alloys, provided that they will not only be exposed to operational conditions, but also to the conditions imposed by all manufacturing stages necessary for the development of a product. It is in this line of thought that fusion welding processes present themselves as promis- ing methods for the development of high entropy alloys, as they involve the exposure of these materials to high temperatures, capable of massively altering their microstructure and, con- sequently, its properties. Such presupposes exploring the relationship between the pro- cessing, microstructure and properties of these advanced alloys. With this in mind, the present work focuses on the weldability of well-known HEA sys- tems, namely the CoCrFeMnNi, AlCoCrFeNi, FeMnCoCr, FeCuCoMnNi and the CoCrNiAlTi sys- tems. Such is done to pursuit the feasibility of these advanced materials in key engineering applications and to address any challenges that may occur during their production.
By providing new ways of discovering new alloy compositions, the high entropy alloy concept has the ability to revolutionize the way engineering applications are produced. Such is possible by developing materials based on the requirements of a determined purpose, that is, with specific properties in visage. Nevertheless, it is necessary to generate knowledge regarding the processability of such novel alloys, provided that they will not only be exposed to operational conditions, but also to the conditions imposed by all manufacturing stages necessary for the development of a product. It is in this line of thought that fusion welding processes present themselves as promis- ing methods for the development of high entropy alloys, as they involve the exposure of these materials to high temperatures, capable of massively altering their microstructure and, con- sequently, its properties. Such presupposes exploring the relationship between the pro- cessing, microstructure and properties of these advanced alloys. With this in mind, the present work focuses on the weldability of well-known HEA sys- tems, namely the CoCrFeMnNi, AlCoCrFeNi, FeMnCoCr, FeCuCoMnNi and the CoCrNiAlTi sys- tems. Such is done to pursuit the feasibility of these advanced materials in key engineering applications and to address any challenges that may occur during their production.
Descrição
Palavras-chave
High entropy alloys Gas tungsten arc welding Synchrotron X-ray diffraction Microstructure Mechanical testing Thermodynamic simulations