| Full text | |
| Author(s): |
Vida, Talita Almeida
;
Soares, Thiago
;
Septimio, Rudimylla Silva
;
Brito, Crystopher Cardoso
;
Cheung, Noe
;
Garcia, Amauri
Total Authors: 6
|
| Document type: | Journal article |
| Source: | MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 22, p. 13-pg., 2019-01-01. |
| Abstract | |
This study aims to analyze the influence of macrosegregation on microstructure evolution, and of microstructure length scale on the corrosion resistance of a Zn-5.0wt.%Mg alloy casting. The analyzed samples were taken along the length of castings unidirectionally solidified in unsteady state conditions of heat extraction. Microstructure characterization, microhardness, linear polarization and electrochemical impedance spectroscopy (EIS) tests were performed. A unique type of microstructure was observed, characterized essentially by a morphology typified by idiomorphic MgZn2 crystals in a "complex eutectic mixture" [coexistence of stable (Zn+Mg2Zn11) and metastable (Zn+MgZn2) eutectics]. The correlation between thermal and microstructural parameters, permitted experimental growth laws, correlating the evolution of the lamellar eutectic spacing with the cooling rate to be established. Vickers microhardness and electrochemical corrosion tests showed that more refined microstructures associated with higher experimental cooling rates, are related to a better set of higher hardness and corrosion resistance. (AU) | |
| FAPESP's process: | 13/23396-7 - Effects of solidification MicrostructureParameters of Aluminum-based multicomponent alloys (Al-Mg-Si; Al-Sn-Cu; Al-Zn-Mg) on the resistances to Corrosionand tribocorrosion degradation |
| Grantee: | Amauri Garcia |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 12/08494-0 - Thermal and Microstructural Parameters in the Transient Solidification of Al-Mg and Al-Mg-Si Alloys and Correlation with Mechanical and Corrosion Resistances |
| Grantee: | Crystopher Cardoso de Brito |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 13/25452-1 - Interrelation of solidification thermal and microstructural parameters and the Tribocorrosive behavior of Al-Zn (mg) and Zn-Mg alloys |
| Grantee: | Emmanuelle Sá Freitas Feitosa |
| Support Opportunities: | Scholarships abroad - Research Internship - Post-doctor |
| FAPESP's process: | 13/15478-3 - Interrelation of Solidification Thermal and Microstructural Parameters and Tribocorrosive Behavior of Al-Zn(Mg) e Zn-Mg Alloys |
| Grantee: | Emmanuelle Sá Freitas Feitosa |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 14/50502-5 - Interrelation of thermal and microstructural solidification parameters and corrosion/tribocorrosion behavior of alloys for tribological, biomedical and solder applications |
| Grantee: | Amauri Garcia |
| Support Opportunities: | Regular Research Grants |