Microhardness and corrosion properties of hypoeutectic Al–7Si alloy processed by high-pressure torsion

Wang, Xue; Nie, Mengyan; Wang, Chuan Ting; Wang, Shun Cai; Gao, Nong

doi:10.1016/j.matdes.2015.06.018

Cited by 80 publications

(40 citation statements)

References 50 publications

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“…CP-Al presents nobler corrosion potential than that of the Al-Co alloys. However, its corrosion potential is just a few decades of mV lower than its pitting potential (E b in Table 3), as has also been observed in other Al-alloys [57,58]. This behavior is consistent with the fact that Al-alloys in aerated halide solutions usually present corrosion potentials close to their pitting potentials, suggesting that the cathodic oxygen reduction, largely within the flawed regions, is sufficient to raise the corrosion potential to the pitting potential [59].…”

Section: Polarization Behavior Of Cp-alsupporting

confidence: 66%

Al-Co Alloys Prepared by Vacuum Arc Melting: Correlating Microstructure Evolution and Aqueous Corrosion Behavior with Co Content

Lekatou

Sfikas

Petsa

et al. 2016

Metals

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Hypereutectic Al-Co alloys of various Co contents (7-20 weight % (wt.%) Co) were prepared by vacuum arc melting, aiming at investigating the influence of the cobalt content on the microstructure and corrosion behavior. Quite uniform and directional microstructures were attained. The obtained microstructures depended on the Co content, ranging from fully eutectic growth (7 wt.% and 10 wt.% Co) to coarse primary Al 9 Co 2 predominance (20 wt.% Co). Co dissolution in Al far exceeded the negligible equilibrium solubility of Co in Al; however, it was hardly uniform. By increasing the cobalt content, the fraction and coarseness of Al 9 Co 2 , the content of Co dissolved in the Al matrix, and the hardness and porosity of the alloy increased. All alloys exhibited similar corrosion behavior in 3.5 wt.% NaCl with high resistance to localized corrosion. Al-7 wt.% Co showed slightly superior corrosion resistance than the other compositions in terms of relatively low corrosion rate, relatively low passivation current density and scarcity of stress corrosion cracking indications. All Al-Co compositions demonstrated substantially higher resistance to localized corrosion than commercially pure Al produced by casting, cold rolling and arc melting. A corrosion mechanism was formulated. Surface films were identified.

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Section: Polarization Behavior Of Cp-alsupporting

confidence: 66%

Al-Co Alloys Prepared by Vacuum Arc Melting: Correlating Microstructure Evolution and Aqueous Corrosion Behavior with Co Content

Lekatou

Sfikas

Petsa

et al. 2016

Metals

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“…On the other hand, while AlSi10Mg has not been processed by HPT yet, there are vast amount of literature on the HPT processing of other Al-Si-based alloys, e.g. Al-2Si, Al-7Si and Al-12 Si [57][58][59][60]. For example, Wang et al [57] attributed the enhanced hardness and corrosion performance of HPTprocessed Al-7Si to breakage of coarse Si particles and intermetallic phases, microstructure homogeneity and increased active sites due to HPT.…”

Section: Introductionmentioning

confidence: 99%

“…Al-2Si, Al-7Si and Al-12 Si [57][58][59][60]. For example, Wang et al [57] attributed the enhanced hardness and corrosion performance of HPTprocessed Al-7Si to breakage of coarse Si particles and intermetallic phases, microstructure homogeneity and increased active sites due to HPT. Mungole et al [58] found a correlation between microhardness and microstructural homogeneity in HPT-processed Al-7Si.…”

Section: Introductionmentioning

confidence: 99%

Effect of sample orientation on the microstructure and microhardness of additively manufactured AlSi10Mg processed by high-pressure torsion

Yusuf

Hoegden

Gao

2020

Int J Adv Manuf Technol

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For the first time, high-pressure torsion (HPT) was applied to additively manufactured AlSi10Mg built in two directions (vertical and horizontal) by selective laser melting (SLM), and the influence of extreme torsional strain on the porosity, microstructure and microhardness of the alloy was investigated. ImageJ analysis indicates that significant porosity reduction is achieved by 1/4 HPT revolution (low strain). Optical microscopy (OM) and scanning electron microscopy (SEM) observations reveal the steady distortion and elongation of the melt pools, the continuous elongation of the cellular-dendritic Al matrix and breakage of the eutectic Si phase network with increased HPT revolutions. Microhardness measurements indicate that despite the significant increase in hardness attained from HPT processing, hardness saturation and microstructural homogeneity are not achieved even after 10 HPT revolutions. X-ray diffraction (XRD) line broadening analysis demonstrates increased dislocation densities with increased HPT revolutions, which contributes to the considerably higher hardness values compared to as-received samples.

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“…Although the effect of various SPD processes on corrosion of magnesium was investigated thoroughly [5,6,8,12,[19][20][21], nevertheless little attention was devoted to the development of electrochemical behavior in the HPT-processed Mg alloys [9,10,[22][23][24] where reports have centered mainly on noting that more refined grains lead to a more homogenous corrosion. In practice, processing by HPT permits a study of corrosion behavior over a wide range of grain sizes and grain size distributions [25,26].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical behavior of a magnesium ZK60 alloy processed by high-pressure torsion

Torbati-Sarraf

Poursaee

et al. 2019

Corrosion Science

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High-pressure torsion (HPT) was used to evaluate the effect of straining on the electrochemical properties of a ZK60 magnesium alloy. The samples were processed using HPT up to 20 turns and the electrochemical responses were examined through polarization, EIS, Mott-Schottky and hydrogen evolution tests. Electron back-scatter diffraction (EBSD) studies showed more homogeneity with finer average grain sizes accompanied by the evolution of a nobler texture when increasing the numbers of HPT turns. Ultimately, this led to improved corrosion behavior for the HPT-processed disks. Post corrosion observations revealed improved protective layers after higher turns of HPT.

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Microhardness and corrosion properties of hypoeutectic Al–7Si alloy processed by high-pressure torsion

Cited by 80 publications

References 50 publications

Al-Co Alloys Prepared by Vacuum Arc Melting: Correlating Microstructure Evolution and Aqueous Corrosion Behavior with Co Content

Al-Co Alloys Prepared by Vacuum Arc Melting: Correlating Microstructure Evolution and Aqueous Corrosion Behavior with Co Content

Effect of sample orientation on the microstructure and microhardness of additively manufactured AlSi10Mg processed by high-pressure torsion

Electrochemical behavior of a magnesium ZK60 alloy processed by high-pressure torsion

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