New Al-alloys with dispersed stable quasicrystal approximant phases: Overcoming the barrier of conventional casting processing and microstructure design

Autor(es)

Ferreira, Tales ; Koga, Guilherme Yuuki ; Gargarella, Piter ; Kiminami, Claudio Shyinti ; Botta, Walter Jose ; Bolfarini, Claudemiro

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF MANUFACTURING PROCESSES; v. 98, p. 10-pg., 2023-05-11.

Resumo

Multi-stage manufacturing processes, high production costs and narrow two-phase field of Al-alloys containing Al-FCC and quasicrystals or approximants phases have been barriers to the widespread use of these alloys in technological applications. In the present work, we demonstrated that new Al-alloys with dispersed stable quasicrystal approximant phases can be produced by conventional metallurgical fabrication methods. Six alloys containing different volume fractions (5% up to 40%) of the approximant alpha-phase were designed and produced by conventional solidification in a graphite mold. The hardness and tribological properties of Al-FCC matrix with different volume fractions of the quasicrystal approximant phase were evaluated. A wide range of wear rates, from 2.1 x 10-3 mm3/Nm to 6.3 x 10-4 mm3/Nm, could be achieved by tuning the volume fraction of the alpha-phase ranging from 5% up to 40%, respectively. Low coefficient of friction values around 0.3 were observed after the running-in periods, regardless of the alpha-phase content, indicating that the quasicrystal approximant phase played a critical role. The alloy containing 25% of alpha-phase was chosen to be processed by different manufacturing processes to show that the morphology of the stable approximant alpha-phase can also be controlled. This finding opens new perspectives for the commercial application of products derived from such light-and wear-resistant materials. (AU)

• Processo FAPESP: 17/27031-4 - Influência de parâmetros de processo nas características metalúrgicas de peças fabricadas por manufatura aditiva
• Beneficiário: Piter Gargarella
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores