Cooling rate and structure of commercial aluminium alloys

2004 ◽  
Author(s):  
Jim Kellie
Keyword(s):  
Cooling Rate ◽  
Aluminium Alloys ◽  
Commercial Aluminium

“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.

Structures and Properties of Commercial Aluminium Alloys after Severe Straining

1998 ◽  
pp. 421-426
Author(s):  
M. V. Markushev ◽  
C. C. Bampton ◽  
M. Yu. Murashkin ◽  
D. A. Hardwick
Keyword(s):  
Aluminium Alloys ◽  
Structures And Properties ◽  
Commercial Aluminium

Performance of commercial aluminium alloys as anodes in gelled electrolyte aluminium-air batteries

2015 ◽  
Vol 299 ◽  
pp. 195-201 ◽  
Author(s):  
M. Pino ◽  
J. Chacón ◽  
E. Fatás ◽  
P. Ocón
Keyword(s):  
Aluminium Alloys ◽  
Commercial Aluminium

scholarly journals Modelling the Precipitation of Al3X Dispersoids in Aluminium Alloys and their Effect on Recrystallization

2007 ◽  
Vol 550 ◽  
pp. 45-54
Author(s):  
Joseph D. Robson ◽  
Philip B. Prangnell ◽  
Brian J. McKay ◽  
Chris P. Heason
Keyword(s):  
Strain Rate ◽  
Uniform Distribution ◽  
Aluminium Alloys ◽  
Thickness Variation ◽  
Isothermal Hold ◽  
Stored Energy ◽  
Electron Backscattered Diffraction ◽  
Combined Model ◽  
Homogenization Treatment ◽  
Commercial Aluminium

A combined model is presented that predicts the non-uniform distribution of Al3X dispersoid particles in commercial aluminium alloys containing zirconium and scandium and uses these predictions as inputs to a simple recrystallization model. The recrystallization model relies on knowledge of the stored energy in the sub-structure after deformation and this has been measured using electron backscattered diffraction (EBSD) techniques. The recrystallization model is based on the concept that partial recrystallization results from the non-uniform distribution of dispersoid particles due to their precipitation from a segregated cast structure. The model has been used to devise an improved homogenization treatment for AA7050, which uses an isothermal hold during heat up to maximize dispersoid nucleation. It has also been applied to predict the effect of scandium additions on recrystallization, investigate the factors that control the through thickness variation in recrystallized fraction, and interpret the results of experiments where the effect of strain rate have been studied.

Constitutive flow curve approximation of commercial aluminium alloys at low temperatures

2015 ◽  
Vol 88 ◽  
pp. 659-666 ◽  
Author(s):  
R. Schneider ◽  
R.J. Grant ◽  
N. Sotirov ◽  
G. Falkinger ◽  
F. Grabner ◽  
...  
Keyword(s):  
Aluminium Alloys ◽  
Low Temperatures ◽  
Flow Curve ◽  
Curve Approximation ◽  
Commercial Aluminium

Microstructural Evolution during Ingot Preheat in 7xxx Aluminium Alloys for Thick Semiproduct Applications

2006 ◽  
Vol 519-521 ◽  
pp. 549-554 ◽  
Author(s):  
Seong Taek Lim ◽  
Yong Yun Lee ◽  
Il Sang Eun
Keyword(s):  
Aluminum Alloys ◽  
Cooling Rate ◽  
Temperature Interval ◽  
Microstructural Evolution ◽  
Aluminium Alloys ◽  
S Phase ◽  
Constitutional Change ◽  
Preheat Temperature ◽  
Quaternary Phase ◽  
M Phase

Recent 7xxx aluminum alloys have been designed for the finite use of thick semiproduct with contolled amount of constituent phases which mostly evolve during ingot preheat. In this study, the effects of constitutional change and preheat conditions of 7175 and 7050 type alloys on the evolution of constituent phases [M-, T-, S-phase and dispersoid] are presented. The constiuents evolve depending on the constitutional effect, primarily the change of Zn:Mg ratio, preheat condition comprising temperature and cooling rate following preheat. T- and M-phase are reprecipitated during cooling after preheat, depending on the alloy constitutions. S-phase is evolved depending on the constitution and preheat temperature, rather than preheat cooling rate. Prominent precipitation temperature interval of constituents are discussed in view of quaternary phase evolutions. In addition, evolutions of dispersoids together with M-phase are discussed. Specific alloy designs and preheat conditions could provide controlled microstructures for the thick 7xxx semiproducts.

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