Influence of scandium on the pitting behaviour of Al–Zn–Mg–Cu alloys

Wloka, J.; Virtanen, Sannakaisa

doi:10.1016/j.actamat.2007.08.021

Cited by 67 publications

(41 citation statements)

References 19 publications

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“…A little amount of Sc utilized in alloys with specific control even with a little variation possibly may have a great impact on material performance. Zn and Mg elements also cause of quench sensitivity, which is the premature precipitation of coarse η particles and it reduced by Sc addition [19]. Thus, conductivity is an indirect measurement of the phase transformation which indication of the type, size and amount of precipitates formation in aluminium alloys.…”

Section: Resultsmentioning

confidence: 99%

Investigation of Microstructure And Mechanical Properties of Al-Zn-Mg and Al-Zn-Mg-Sc Alloys After Double Passes Friction Stir Processing

Mandal¹

2017

IJMSE

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Abstract:In this study, the two types of aluminium alloys namely Al-Zn-Mg and Al-Zn-Mg-Sc were developed by casting route. The cast plates were subjected to double passes friction stir processing (FSP) by in-situ vertically fitted milling machine. The tool design and process parameters were found to affect the microstructural and mechanical properties of these aluminium alloys. Therefore, the experimental samples were collected from the stirring zone and selected for mechanical testing. The FSP caused intense plastic deformation, material mixing, and thermal exposure, resulting in significant microstructural refinement, densification, and homogeneity of processed zone. It has been observed that the mechanical properties improved as a result of the complex interactions due to FSP, thermo-mechanical effects, dissolution, coarsening and re-precipitation of the strengthening precipitates in these two experimental aluminium alloys. It can be concluded that the strengthening effect of the Al-Zn-Mg and Al-Zn-Mg-Sc alloys after FSP are associated with the fine grain strengthening, subgrain strengthening and precipitation strengthening of Al3Sc and MgZn2 precipitates. Finally, the resultant properties have been evaluated by FSP parameters such as rotational speed of 1000 rpm and traverse speed of 70 mm/min and specified tool design. In addition, the detrimental effect of high Zn content (~8.20 wt.%) and high Sc content (~0.87 wt.%) aluminium alloy may be attributed to the vaporization of Zn at the time of the FSP. The experimental samples were collected from double passes FSPed zone and critically examined for optical microscopy (OM), scanning electron microscopy (SEM), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Vicker's hardness testing, tensile testing and fractographic analysis.

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Section: Resultsmentioning

confidence: 99%

Investigation of Microstructure And Mechanical Properties of Al-Zn-Mg and Al-Zn-Mg-Sc Alloys After Double Passes Friction Stir Processing

Mandal¹

2017

IJMSE

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“…Wloka [11] and Cavanaugh [12] point out that coarse primary Al 3 Sc x Zr 1-x or primary Al 3 Sc particles are both only slightly cathodic to the surrounding а-Al matrix, while impurity intermetallics enriched in Si,…”

Section: Stress Corrosion Cracking Initiationmentioning

confidence: 98%

Stress corrosion cracking of a high-strength friction-stir-welded joint of an Al–Zn–Mg–Zr alloy containing 0.25 wt.% Sc

Deng

Peng

et al. 2015

Corrosion Science

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“…It was possible to measure precisely the electrochemical properties of the thin weld-affected zones without cutting the weld bead. Technical and methodological details of the microelectrochemical cell can be found elsewhere [17][18][19][20][21].…”

Section: Experimental Workmentioning

confidence: 99%

Local electrochemical properties of laser beam‐welded high‐strength Al–Zn–Mg–Cu alloys

Wloka

Hack²,

Virtanen

2008

Materials & Corrosion

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Butt welds of two high-strength Al-Zn-Mg-Cu alloys with different zinc contents were welded by a laser beam welding technique. Due to the high energy density of the laser beam, the microstructural changes are confined to very thin regions. Electrochemical properties of the weld heat-affected zones are investigated by local electrochemical measurement techniques and correlated with microhardness measurements, macroscopic corrosion behaviour and metallographic sections. It turned out that microelectrochemical techniques, especially the EC-pen is a versatile and easy to handle tool for the resolution of changes in the electrochemical properties across a weld bead. It unveils modifications, which cannot be resolved by hardness measurements. By microcell measurements, local corrosion kinetics can be estimated.

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Influence of scandium on the pitting behaviour of Al–Zn–Mg–Cu alloys

Cited by 67 publications

References 19 publications

Investigation of Microstructure And Mechanical Properties of Al-Zn-Mg and Al-Zn-Mg-Sc Alloys After Double Passes Friction Stir Processing

Investigation of Microstructure And Mechanical Properties of Al-Zn-Mg and Al-Zn-Mg-Sc Alloys After Double Passes Friction Stir Processing

Stress corrosion cracking of a high-strength friction-stir-welded joint of an Al–Zn–Mg–Zr alloy containing 0.25 wt.% Sc

Local electrochemical properties of laser beam‐welded high‐strength Al–Zn–Mg–Cu alloys

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