| Full text | |
| Author(s): |
Total Authors: 3
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| Affiliation: | [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
Total Affiliations: 2
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| Document type: | Journal article |
| Source: | Journal of Materials Science; v. 56, n. 19, p. 11541-11556, JUL 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
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) | |
| FAPESP's process: | 15/22143-3 - Fatigue behaviour of thixoformed alloys |
| Grantee: | Eugênio José Zoqui |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 18/11802-4 - Mechanical properties of new Al-Si-(Zn-Cu-Mg) aloys for rheocasting and thixoforming |
| Grantee: | Eugênio José Zoqui |
| Support Opportunities: | Regular Research Grants |