| Full text | |
| Author(s): |
Total Authors: 3
|
| Affiliation: | [1] Unicamp. Departamento de Engenharia de Manufatura e Materiais - Brasil
[2] Unicamp. Departamento de Engenharia de Manufatura e Materiais - Brasil
[3] Unicamp. Departamento de Engenharia de Manufatura e Materiais - Brasil
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | MATERIA-RIO DE JANEIRO; v. 27, n. 2 2023-01-13. |
| Abstract | |
ABSTRACT The effect of heat and strain during the semisolid processing route on the microstructural evolution and mechanical performance of the Al-5.5wt%Si-5wt%Zn-0.2wt%Mg alloy was evaluated. The as cast alloy was heated and partially melted to 588 °C (fs = 0.40), thixoformed (in an open die forged) and solution heat-treated (SHT) at 525 °C for 1 to 6 h. The microstructural evolution and chemical distribution (SEM-EDS) of the main alloying elements were evaluated at each step of the processing route. The SHT for 2.5 h after thixoforming showed to be adequate considering (a) the spheroidization of Si crystals, (b) the formation of Fe- and Mn-rich platelet-like particles in the eutectic phase, (c) the Mg dissolution from the Mg2Si conglomerates and (d) the homogeneous Zn diffusion along the entire part. As a consequence of the higher circularity of secondary particles, the possibility of crack formation and propagation under stress was minimized. The possible formation of solute clusters and GP zones containing Zn, Mg, Si and Cu was enabled due to the dissolution and diffusion of secondary elements during SHT, which increased the alloy’s mechanical strength. Larger Si crystals and the homogeneous spatial spread of Zn resulted in the hardness increase of the SHT alloy. (AU) | |
| FAPESP's process: | 13/09961-3 - Upgrade of the Foundry and Thixoforming Laboratory at FEM/Unicamp |
| Grantee: | Eugênio José Zoqui |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 09/08478-1 - Continuous Casting and Thixoforming of new Al-Si-Cu-Mg alloys |
| Grantee: | Luis Vanderlei Torres |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 15/22143-3 - Fatigue behaviour of thixoformed alloys |
| Grantee: | Eugênio José Zoqui |
| Support Opportunities: | Regular Research Grants |