Thixoforging of 332 aluminum alloy in a mechanical eccentric press

Autor(es)

Torres, Luis Vanderlei ^{[1, 2]} ; Naldi, Marcos Antonio ^[2] ; Zoqui, Eugenio Jose ^[2]

Afiliação do(s) autor(es)

^[1] Sao Paulo Fed Inst Educ Sci & Technol IFSP, Av Major Fernando Valle 2013, BR-12903000 Braganca Paulista, SP - Brazil

^[2] Campinas State Univ DEMM FEM UNICAMP, Dept Mat & Mfg Engn, Rua Mendeleyev 200, Cidade Univ Zeferino Vaz\textbackslash{}, BR-13083860 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Materials Science; v. 56, n. 19, p. 11541-11556, JUL 2021.
• Citações Web of Science: 0

Resumo

This study sought to analyze the semi-solid behavior of commercial 332 aluminum alloy during thixoforming in a mechanical eccentric press (thixoforging). The solid-liquid transition, i.e., the working temperatures corresponding to 77%, 67% and 54% fraction solid, was characterized using differential scanning calorimetry and simulation with Thermo-Calc (R) software. The alloy was then heated to the working temperature, held at that temperature for 0, 30, 90 and 210 s and thixoforged. The microstructure was characterized in three distinct regions of the thixoforged product: the end, the curved region and the central region. Different microstructures were observed along the product: in the central region, a completely deformed coarse dendrite microstructure was observed while in the region at the end of the product the microstructure was partially globular because the material flows into the die cavity without suffering significant deformation. The thixoforged alloy with the lowest fraction solid (52%), which was achieved at 572 +/- 2 degrees C, had the most refined structure and smallest dendrite arm spacing (approximately 90 mu m), leading to a yield strength of 151 MPa, ultimate tensile strength of 233 MPa and elongation of 0.6. These mechanical characteristics can be considered excellent as no prior preparation or modification of the raw material was carried out. The material thus has excellent potential for use in both thixoforming and rheocasting. (AU)

• Processo FAPESP: 15/22143-3 - Resistência à fadiga de ligas metálicas tixoconformadas
• Beneficiário: Eugênio José Zoqui
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 18/11802-4 - Propriedades mecânicas de novas ligas Al-Si-(Zn-Cu-Mg) reofundidas e tixoconformadas
• Beneficiário: Eugênio José Zoqui
• Modalidade de apoio: Auxílio à Pesquisa - Regular