Characterization of Rapidly Solidified Materials

Sater, J.M.; Sanders, T. H.; Garrett, R. K.

doi:10.1520/stp33025s

Cited by 9 publications

(8 citation statements)

References 6 publications

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“…This morphology indicates the possibility of extensive pre-eutectic Al 9 Co 2 presence, consistent with Sater et al [48,49]. More specifically, the above authors noticed that the volume fraction of coarse Al 9 Co 2 precipitates in RS Al-alloys increased as the Co content increased or the cooling rate decreased.…”

Section: Microstructure Evolutionsupporting

confidence: 88%

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: Microstructure Evolutionsupporting

confidence: 88%

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

View full text Add to dashboard Cite

show abstract

“…This morphology indicates the possibility of extensive pre-eutectic Al 9 Co 2 presence, in consistency with Sater et al [29]. It seems that, in the case of high Co concentration, the preeutectic stage cannot be suppressed (due to the low conductivity of Al 9 Co 2 CMA) and the growth of coarse primary Al 9 Co 2 is favored.…”

Section: Resultssupporting

confidence: 89%

Solid Particle Erosion of Aluminum In-Situ Reinforced with a Cobalt Aluminide

Lekatou¹

2017

Mater. Sci. Eng. Adv. Res

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The present effort studies the comparative solid particle erosion behaviour of Al-Co alloys of various compositions in the AlAl 9 Co 2 side of the Al-Co phase diagram. The alloys have been prepared by vacuum arc melting. The main concept behind the selection of the Al-Al 9 Co 2 region of the Al-Co phase diagram was the attainment of a two-phase structure (Al + Al 9 Co 2 ) that could combine the beneficial attributes of Al 9 Co 2 , as a Complex Metallic Alloy in-situ reinforcement, with the ductility/toughness of Al, as a matrix to the brittle intermetallic.Hypereutectic Al-Co alloys of various Co contents (7, 10, 15 and 20 wt.% Co), as well as monolithic commercially pure Al, were prepared by vacuum arc melting. The alloys were subjected to solid particle erosion testing at two impact angles (60° and 90°). The test results were interpreted based on weight change measurements and scanning electronic microscopy. It was revealed that the governing mechanisms change as the impact angle and the reinforcement volume fraction change. It was shown that factors affecting the brittle/ductile character of the material, such as Al 9 Co 2 volume fraction, Al 9 Co 2 coarseness, Co dissolved in Al, play a primary role on the erosion response of the alloys. The Al-Co alloys showed higher wear rates than Al. The wear rate increased with Co and, consequently, Al 9 Co 2 increasing. The surface characteristics and degradation mechanisms are being discussed.

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“…The OCP values of the T7 tempers of both alloys are the most negative, whereas the OCP values of the RRA tempers lie in between that of the T7 and T8 tempers. In general, in a given electrolyte, the OCP value depends on the microstructure and the constituent alloy phase [9,10,34].…”

Section: Electrochemical Polarization and Alloy Tempersmentioning

confidence: 99%

“…Corrosion behaviour and electrochemical investigation have been carried out on Al-Li alloys by several investigators [9][10][11][12][13]. There are considerable differences in opinion between workers about the corrosion behaviour of these alloys.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical behaviour of retrogressed and reaged (RRA) 8090 and 1441 Al–Li–Cu–Mg–Zr alloys

2006

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8090 and 1441 Al-Li-Cu-Mg-Zr alloys of peak aged T8 tempers were subjected to retrogression treatment followed by reageing to peak aged (RRA) T77 tempers. Electrochemical polarization studies were carried out on the alloys of T8, T77 and over aged T7 tempers, in 3.5% NaCl, 3.5% NaCl + 0.1M LiCl + 0.3% H 2 O 2 and 3.5% NaCl + 0.1M LiCl + 0.7% H 2 O 2 solutions. The shape of the polarization curves is similar for all the tempers of both alloys in all environments. The corrosion rates are more or less the same irrespective of the tempers. However, the open circuit potentials (OCP) shift towards more negative potential with the RRA treatment and ageing time.The OCP values of the T7 tempers were found to be the most negative; for the T77 tempers it lies between that of the T7 and T8. Further, the OCP values for all tempers of both alloys shifted anodically with addition of LiCl and H 2 O 2 in 3.5% NaCl solution. TEM, XRD and DSC studies of microstructural features of the alloys in the T8, RRA and T7 tempers have been used to explain the observed electrochemical behaviour.

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Characterization of Rapidly Solidified Materials

Cited by 9 publications

References 6 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

Solid Particle Erosion of Aluminum In-Situ Reinforced with a Cobalt Aluminide

Electrochemical behaviour of retrogressed and reaged (RRA) 8090 and 1441 Al–Li–Cu–Mg–Zr alloys

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