Aluminium and aluminium alloys. Aluminium sheet, strip and plate for electrotechnical applications

2015 ◽  
Keyword(s):  
Aluminium Alloys ◽  
Aluminium Sheet

Experimental Detection of the Onset of Local Necking in an Aluminium Sheet

2014 ◽  
Vol 794-796 ◽  
pp. 590-595 ◽  
Author(s):  
Dmitry Vysochinskiy ◽  
Terence Coudert ◽  
Odd Sture Hopperstad ◽  
Odd Geir Lademo ◽  
Aase Reyes
Keyword(s):  
Digital Image Correlation ◽  
Standard Method ◽  
Digital Image ◽  
Aluminium Alloys ◽  
Sheet Thickness ◽  
Image Correlation ◽  
Forming Limit ◽  
Local Necking ◽  
Aluminium Sheet ◽  
Experimental Detection

Forming limit diagrams (FLDs) are widely used to assess metal sheet formability. Experimental FLDs are obtained by performing formability tests and determining failure strains. The standard method for detection of forming limits is based on the spatial distribution of the strains and requires formation of a single local neck. Some aluminium alloys, such as AA6016, have a tendency to form multiple strain localizations in formability tests, which can be interpreted as multiple local necks. Thus, use of the standard method is questionable for these aluminium alloys. The present paper presents an alternative, digital-image-correlation-based method for experimental detection of the onset of local necking in an aluminium sheet. The method is based on monitoring the sheet-thickness evolution, and is developed to be user independent and resistant to noise in the measurements. The method can be used in combination with different types of formability tests. The main requirement is that digital image correlation is used for strain measurements. Here, the method is initially tested on uniaxial tension tests of AA6016 aluminium alloy sheets and then extended to formability tests.

“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.

PRECISION PRESSURE WELDING OF ALUMINIUM ALLOYS

2017 ◽  
pp. 67-76 ◽  
Author(s):  
Oleg Novomlynets ◽  
◽  
Serhii Oleksiienko ◽  
Svitlana Yushchenko ◽  
Evgen Polovetskiy ◽  
...  
Keyword(s):  
Aluminium Alloys ◽  
Pressure Welding
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