| Full text | |
| Author(s): |
Torres, Luis Vanderlei
;
Torres, Luis Fernando
;
Zoqui, Eugenio Jose
Total Authors: 3
|
| Document type: | Journal article |
| Source: | ADVANCES IN MATERIALS SCIENCE AND ENGINEERING; v. 2016, p. 7-pg., 2016-01-01. |
| Abstract | |
This work evaluates themorphological evolution at the semisolid state of the Al-4.0wt% Si-2.5wt% Cu alloy produced by direct chill casting under electromagnetic stirring (EMS) and by one equal channel angular pressing (ECAP) pass. The ECAP emerged as a promising technique capable of reduction and homogeneous metals microstructure imposing large deformations occurs in amatrix that contains two channels of the same cross-sectional area and forms an angle of 120 degrees. The materials were submitted to reheating treatment in condition of 60% solid fraction at treatment times of 0, 30, and 90 s. Comparing the two cases, we have the presented ECAP process that had an excellent response to the recovery and recrystallization mechanisms, and refined microstructures ideal for thixoforming were produced. Primary particle sizes of about 15 mu m and grain sizes of about 75 mu m and a circularity shape factor of more than 0.60 were obtained. The low silicon alloy, Al-4.0wt% Si-2.5wt% Cu, presented excellent refinement when processed via equal channel angular pressing, presenting good morphological stability at the semisolid state, without significant changes in size or shape of the solid particles. This fully globular structure is favourable for thixoforming processes. (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: | 15/22143-3 - Fatigue behaviour of thixoformed alloys |
| 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 |