Thermomechanical behavior of Al-Cu-Si commercial alloy modified with rare earths

• J. Camarillo-Cisneros ^[1] ; R. Pérez-Bustamante ^[2] ; R. Martínez-Sánchez ^[3]
  1. [1] Universidad Autónoma de Chihuahua

     Universidad Autónoma de Chihuahua

     México

     
  2. [2] CONACYT-Corporación Mexicana de Investigación en Materiales S.A. de C.V., S.L.P., México
  3. [3] Centro de Investigación en Materiales Avanzados, Laboratorio Nacional de Nanotecnología, Chihuahua, México

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• Localización: Revista Mexicana de Física, ISSN-e 0035-001X, Vol. 66, Nº. 6, 2020, págs. 782-789
• Idioma: inglés
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• Resumen

  • Microstructural and mechanical effects were studied on automotive-grade 319 aluminum alloy after cerium/lanthanum rare earth additions at room and hot working conditions. Cerium/lanthanum additions formed micrometric phases in AA319, which were stable under room and hot working conditions. In comparison with reference alloy, Ce/La doped alloys reduced the eutectic-Si up to 85%. The effect of the Ce/La addition produced an increase in hardness and UTS under room temperature while improved mechanical performance in high-temperature working conditions. These improvements were attained to the presence of well-dispersed Ce/La micrometric needles, and the amount increase of θ’-phase (Al_(2)Cu) across the aluminum matrix. The θ’ interfered directly with crack diffusion in the solid in two crystallographic directions. Additionally, it was observed through transmission electron microscopy, that Ce/La presence altered the precipitation kinetics in the formation of the coherent θ from the θ’.