Er addition to Al-Si-Mg-based casting alloy: Effects on microstructure, room and high temperature mechanical properties

Colombo, Marco; Gariboldi, Elisabetta; Morri, Alessandro

doi:10.1016/j.jallcom.2017.03.076

Cited by 102 publications

(65 citation statements)

References 29 publications

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“…From previous studies, it was found that additions of Er and Zr induced drastic changes in A356 microstructure, like an evident change in eutectic Si morphology, which was modified from plate‐like to fibrous in the as‐cast state, the nucleation of globular dendrites due to the inoculation effects of Zr‐containing pro‐peritectic intermetallics and the precipitation of Er‐ and Zr‐containing coarse intermetallic compounds in the eutectic region. This investigation aims to clarify the influence of these microstructural aspects on the corrosion resistance of an A356 alloy with Er and Zr additions.…”

Section: Introductionmentioning

confidence: 99%

“…[1] Scientific research, in the last decades, has devoted a great attention in improving the mechanical strength and thermal resistance of hypoeutectic Al-Si-Mg alloys by tuning the alloy's chemical composition, with the scope of inducing the precipitation of nanometric strengthening dispersoids able to retard dislocation motion at room and high temperatures. [1][2][3][4][5][6] In particular, rare earth and transition elements were found to induce significant strengthening effects and improved thermal resistance when added in suitable amount in an A356 Al-Si-Mg alloy. [4][5][6] Despite the high number of papers devoted to the development of innovative Al alloys with tuned chemical composition to improve mechanical strength, very few investigations addressed their corrosion behavior.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of localized corrosion of heat treated Er‐ and Zr‐containing A356 alloys in 3.5 wt% NaCl aqueous solution

Colombo

Buzolin

Gariboldi

et al. 2018

Materials & Corrosion

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The influences of Er and Zr additions on the corrosion behavior of A356 (Al‐7Si‐0.4Mg) alloy are investigated. Electrochemical tests (potentiodynamic polarization and electrochemical impedance spectroscopy), gravimetric analyses, and microstructural investigations demonstrate that 0.3 wt% Er nominal addition is beneficial for the corrosion resistance of A356 alloy, due to a modified eutectic morphology and a low volume fraction of intermetallic compounds. The further addition of about 0.5 wt% Zr, on the other hand, partially reduces the corrosion resistance of Er‐containing A356 alloy, possibly due to a higher amount of intermetallic compounds which promote corrosion localization.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of localized corrosion of heat treated Er‐ and Zr‐containing A356 alloys in 3.5 wt% NaCl aqueous solution

Colombo

Buzolin

Gariboldi

et al. 2018

Materials & Corrosion

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“…Additions of Er and Zr also induced the formation of different intermetallic compounds with respect to those typically found in commercial A356 alloy, as it was described in Colombo et al; scope of this study is to perform SKPFM analyses on the intermetallic compounds present in the microstructure of Er‐ and Zr‐containing alloys and to define their influence on corrosion initiation.…”

Section: Introductionmentioning

confidence: 69%

SKPFM investigations of intermetallic compounds of innovative Er‐ and Zr‐containing Al–Si–Mg alloys and their influence on corrosion localization in saline solution

Colombo

Gariboldi

Morri

et al. 2019

Materials & Corrosion

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The paper aims at characterizing the influence of intermetallic compounds on the corrosion localization of innovative Al–Si–Mg Er‐ and Zr‐containing casting alloys. Samples of the investigated materials were studied by means of optical and scanning electron microscope micrographs, immersion tests, and scanning Kelvin probe force microscope (SKPFM) analyses in the T6 temper. Combination of immersion tests and SKPFM analyses allowed to identify those classes of intermetallic compounds promoting localization of the corrosion process. It was found that intermetallic compounds richer in Fe were the most critical for corrosion localization; furthermore, additions of Er caused a marked decrease of the potential difference of intermetallic compounds with respect to the Al matrix and a consequent less intense microgalvanic coupling, which translates into slower corrosion kinetics. Further, Zr additions slightly increased the potential difference of intermetallic compounds with the Al matrix, promoting a faster corrosion process.

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“…In the recent years of research studies the effect of low additions of erbium on the properties and microstructure of aluminum and its alloys has been intense [1][2][3][4][5][6][7][8][9][10]. The typical content of erbium in wrought and aluminium cast alloys are varies from 0.01 to 1.0 mass %, but preferably 0.1-0.3 mass % [11].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Novel Al-Er Master Alloys in Chloride-Fluoride Melt

Kosov

Bazhin

2018

MSF

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Abstract. A novel Al-Er master alloy has been prepared through situ metallothermic reactions of NaErF 4 and aluminium melts. The compound NaErF 4 is formed as a result of the interaction of NaF and ErF 3 in the melt medium KCl. The metallothermic reactions produce erbium, which through low solubility in molten aluminium and forms intermetallic compound Al 3 Er. The microstructures of the Al-Er master alloy with different contents of the alloying metal has been investigated. The results showed that the Al-Er master alloy mainly consisted of phases of α-Al and Al 3 Er, that confirmed by the results of X-ray diffraction. Backscattered electron imaging of the Al-Er master alloy under a scanning electron microscope (SEM) revealed the presence of phase Al 3 Er, which crystallized in the eutectic composition [Al+Al 3 Er]. The observed microstructure is explained according to the eutectic reaction in an Al-Er phase diagram. The preparation of Al-Er master alloy by the metallothermic reduction method will allow to reduce energy consumption for master alloy production and to reduce the cost of aluminium alloys alloyed with Er through the novel master alloy.

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Er addition to Al-Si-Mg-based casting alloy: Effects on microstructure, room and high temperature mechanical properties

Cited by 102 publications

References 29 publications

Characterization of localized corrosion of heat treated Er‐ and Zr‐containing A356 alloys in 3.5 wt% NaCl aqueous solution

Characterization of localized corrosion of heat treated Er‐ and Zr‐containing A356 alloys in 3.5 wt% NaCl aqueous solution

SKPFM investigations of intermetallic compounds of innovative Er‐ and Zr‐containing Al–Si–Mg alloys and their influence on corrosion localization in saline solution

Preparation of Novel Al-Er Master Alloys in Chloride-Fluoride Melt

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