Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (6): 695-709.DOI: 10.1007/s40195-018-0852-z
Special Issue: 2019年铝合金专辑; 2019年腐蚀专辑-2
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Barros André1, Cruz Clarissa3, P. Silva Adrina1, Cheung Noé3, Garcia Amauri3, Rocha Otávio1,2(), Moreira Antonio1
Received:
2018-08-22
Revised:
2018-10-11
Online:
2019-06-10
Published:
2019-06-17
Supported by:
Barros André, Cruz Clarissa, P. Silva Adrina, Cheung Noé, Garcia Amauri, Rocha Otávio, Moreira Antonio. Horizontally Solidified Al-3 wt%Cu-(0.5 wt%Mg) Alloys: Tailoring Thermal Parameters, Microstructure, Microhardness, and Corrosion Behavior[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(6): 695-709.
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Metals | Al | Fe | Ni | Cu | Mg | Si | Cr | Zn |
---|---|---|---|---|---|---|---|---|
Al | Balance | 0.175 | 0.0148 | 0.024 | 0.0011 | 0.103 | - | - |
Cu | - | - | - | Balance | - | 0.09 | 0.27 | - |
Mg-Al | 6.981 | 0.001 | 0.001 | 0.115 | Balance | 0.246 | - | 0.631 |
Al-3 wt%Cu | Balance | 0.22 | - | 3.14 | - | 0.04 | 0.02 | - |
Al-3 wt%Cu-0.5 wt%Mg | Balance | 0.13 | - | 3.69 | 0.42 | 0.05 | 0.007 | - |
Table 1 Chemical compositions ( wt%) of metals used and prepared alloys
Metals | Al | Fe | Ni | Cu | Mg | Si | Cr | Zn |
---|---|---|---|---|---|---|---|---|
Al | Balance | 0.175 | 0.0148 | 0.024 | 0.0011 | 0.103 | - | - |
Cu | - | - | - | Balance | - | 0.09 | 0.27 | - |
Mg-Al | 6.981 | 0.001 | 0.001 | 0.115 | Balance | 0.246 | - | 0.631 |
Al-3 wt%Cu | Balance | 0.22 | - | 3.14 | - | 0.04 | 0.02 | - |
Al-3 wt%Cu-0.5 wt%Mg | Balance | 0.13 | - | 3.69 | 0.42 | 0.05 | 0.007 | - |
Fig. 4 Cooling curves for a Al-3 wt%Cu and b Al-3 wt%Cu-0.5 wt%Mg alloys at different positions from the cooled surface of the ingots, c plots of position from the cooled interface of the ingots as a function of time corresponding to the passage of the liquidus front by each thermocouple, dGR and CR as a function of position from the cooled interface for the two analyzed alloys ingots. R2 is the coefficient of determination
Fig. 5 Horizontally solidified macrostructure and as-cast dendritic microstructures of longitudinal sections of: a Al-3 wt%Cu, b Al-3 wt%Cu-0.5 wt%Mg alloys ingots
Fig. 7 Scheil-Gulliver non-equilibrium solidification path calculated by the Thermo-Calc software for a Al-3 wt%Cu, b Al-3 wt%Cu-0.5 wt%Mg alloys with 0.15 wt%Fe
Fig. 8 EDS element mapping and point microanalysis detailing the phases formed during the solidification process of: a Al-3 wt%Cu, b Al-3 wt%Cu-0.5 wt%Mg alloys
Fig. 10 Bode and Bode-phase diagrams for: a Al-3 wt%Cu and b Al-3 wt%Cu-0.5 wt%Mg alloys. Nyquist plots for: c Al-3 wt%Cu, d Al-3 wt%Cu-0.5 wt%Mg alloys samples in a 0.5 M NaCl solution at 25 °C
Fig. 11 Experimental potentiodynamic polarization curves of investigated alloys in a 0.5 M NaCl solution at 25 °C for samples extracted from aP?=?10 mm, bP?=?50 mm. c Corrosion potential (Ecorr) and corrosion current density (icorr) calculated from potentiodynamic polarization curves
Alloy | Sample, P (mm) | Ecorr (mV) | Icorr (μA/cm2) | Rpol (Ω cm2) | θmax (deg.) |
---|---|---|---|---|---|
Al-3 wt%Cu | 10 | -?726 | 0.341 | 13,139 | 80.73 |
50 | -?697 | 0.103 | 16,494 | 80.33 | |
Al-3 wt%Cu-0.5 wt%Mg | 10 | -?622 | 1.590 | 9147 | 78.38 |
50 | -?630 | 1.193 | 12,612 | 77.34 |
Table 2 Electrochemical parameters of the examined alloys samples in a 0.5 M NaCl solution
Alloy | Sample, P (mm) | Ecorr (mV) | Icorr (μA/cm2) | Rpol (Ω cm2) | θmax (deg.) |
---|---|---|---|---|---|
Al-3 wt%Cu | 10 | -?726 | 0.341 | 13,139 | 80.73 |
50 | -?697 | 0.103 | 16,494 | 80.33 | |
Al-3 wt%Cu-0.5 wt%Mg | 10 | -?622 | 1.590 | 9147 | 78.38 |
50 | -?630 | 1.193 | 12,612 | 77.34 |
Fig. 12 Optical micrographs of a Al-3 wt%Cu, b Al-3 wt%Cu-0.5 wt%Mg alloys samples after the corrosion test in 0.5 M NaCl solution at room temperature
Fig. 13 Typical SEM micrographs with EDS elemental mapping of a Al-3 wt%Cu, b Al-3 wt%Cu-0.5 wt%Mg alloys after the corrosion test in 0.5 M NaCl solution at room temperature
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