Metastable pitting characteristics of aluminium alloys measured using current transients during potentiostatic polarisation

2012 ◽  
Vol 66 ◽  
pp. 245-254 ◽  
Author(s):  
R.K. Gupta ◽  
N.L. Sukiman ◽  
M.K. Cavanaugh ◽  
B.R.W. Hinton ◽  
C.R. Hutchinson ◽  
...  
Keyword(s):  
Aluminium Alloys ◽  
Current Transients ◽  
Metastable Pitting ◽  
Potentiostatic Polarisation

Evaluation of metastable pitting on titanium by charge integration of current transients

2010 ◽  
Vol 52 (10) ◽  
pp. 3158-3161 ◽  
Author(s):  
Zhonglin Jiang ◽  
Truls Norby ◽  
Hugh Middleton
Keyword(s):  
Current Transients ◽  
Metastable Pitting ◽  
Charge Integration

“Cavity” formation in superplastically deformed aluminium alloys

1990 ◽  
Vol 48 (4) ◽  
pp. 958-959
Author(s):  
A. Cziráki ◽  
E. Ková-csetényi ◽  
T. Torma ◽  
T. Turmezey
Keyword(s):  
Grain Boundaries ◽  
Aluminium Alloys ◽  
Superplastic Deformation ◽  
Volume Fraction ◽  
Superplastic Forming ◽  
Polished Surface ◽  
Cavity Formation ◽  
Stress Concentrations ◽  
Electron Microscopic ◽  
Commercial Aluminium

It is known that the formation of cavities during superplastic deformation can be correlated with the development of stress concentrations at irregularities along grain boundaries such as particles, ledges and triple points. In commercial aluminium alloys Al-Fe-Si particles or other coarse constituents may play an important role in cavity formation.Cavity formation during superplastic deformation was studied by optical metallography and transmission scanning electron microscopic investigations on Al-Mg-Si and Al-Mg-Mn alloys. The structure of particles was characterized by selected area diffraction and X-ray micro analysis. The volume fraction of “voids” was determined on mechanically polished surface.It was found by electron microscopy that strongly deformed regions are formed during superplastic forming at grain boundaries and around coarse particles.According to electron diffraction measurements these areas consist of small micro crystallized regions. See Fig.l.Comparing the volume fraction and morphology of cavities found by optical microscopy a good correlation was established between that of micro crystalline regions.

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