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The free energy change associated with dissolving a solute in a liter of solvent is called the free energy of a solution, ΔGsolution. The overall ΔGsolution is expressed as the balance of ΔGinteraction against the always-favorable free-energy of mixing, ΔGmixing. Solution formation is favorable if  ΔGsolution is less than zero, whereas it is unfavorable if ΔGsolution is greater than zero. In short, for a solution to form and complete dissolution to take place,...
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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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An Available Technique for Preparation of New Cast MnCuNiFeZnAl Alloy with Superior Damping Capacity and High Service Temperature
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Las soluciones sólidas de entalpía de mezcla negativa proporcionan una alta resistencia y ductilidad

Zibing An1, Ang Li1, Shengcheng Mao2

  • 1Beijing Key Laboratory of Microstructure and Property of Advanced Materials, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, China.

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Resumen

Este estudio introduce una aleación HfNbTiVAl con una resistencia al rendimiento y una ductilidad de tracción excepcionales, superando las limitaciones de las aleaciones refractarias de elementos múltiples (MPEA) para aplicaciones exigentes.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Trabajos de metalurgia
  • Física del estado sólido

Sus antecedentes:

  • Las aleaciones refractarias de varios elementos principales (MPEAs) ofrecen una alta resistencia de rendimiento para aplicaciones estructurales.
  • La ductilidad de tracción limitada a temperatura ambiente dificulta la procesabilidad y la escalabilidad del MPEA.

Objetivo del estudio:

  • Desarrollar un MPEA con una combinación sinérgica de resistencia al rendimiento ultraalto y gran ductilidad en la tracción.
  • Investigar los mecanismos microstruturales responsables de las propiedades mecánicas mejoradas.

Principales métodos:

  • Diseño de composición de una aleación HfNbTiVAl.
  • Pruebas mecánicas, incluidas las pruebas de tracción a temperatura ambiente.
  • Análisis microestructural para investigar las fluctuaciones químicas jerárquicas (HCF) y el comportamiento de la dislocación.

Principales resultados:

  • La aleación HfNbTiVAl exhibe una resistencia de rendimiento de aproximadamente 1.390 MPa y una ductilidad de tracción de aproximadamente 20%.
  • La adición de aluminio promueve una mezcla de solución sólida de entalpía negativa y fluctuaciones químicas jerárquicas (HCF).
  • Los HCF crean límites difusos que impiden el movimiento de dislocación, lo que lleva a una inestabilidad plástica retrasada y una ductilidad mejorada.

Conclusiones:

  • La aleación HfNbTiVAl desarrollada logra una sinergia sin precedentes de alta resistencia y ductilidad.
  • Las fluctuaciones químicas jerárquicas son clave para acomodar la deformación plástica en los MPEA.
  • Esta investigación proporciona información para el diseño de MPEAs avanzados con propiedades mecánicas superiores.