Calorimetric study of the oxidation of Al–Mg alloys for the prediction of healing of the double oxide film defect

Amirinejhad, S.; Raiszadeh, Ramin; Doostmohammadi, Hamid

doi:10.1007/s10973-012-2810-8

Cited by 10 publications

(2 citation statements)

References 18 publications

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“…They observed the bonding to occur gradually during the transformation of Al 2 O 3 to MgAl 2 O 4 and then to MgO. The occurrence of such bonding (dubbed healing 1 ) was later confirmed for other aluminium alloys such as commercially pure Al, 12 AlMg 13,14 and Al-0?05 wt-%Sr. 15 The role of double oxide film defects on the formation of hydrogen pores in aluminium castings was also first suggested by Campbell, 1 who calculated the pressure required for homogeneous nucleation of an H bubble in liquid Al melt to be extremely high (i.e.…”

Section: Introductionmentioning

confidence: 87%

Effect of stirring on behaviour of double oxide film defects in A356 aluminium melt

Ahmadpour

Raiszadeh

Doostmohammadi

2014

International Journal of Cast Metals Research

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The effect of stirring of melt on the behaviour of double oxide film (bifilm) defects in A356 melt was investigated using a reduced pressure test (RPT) technique. The melt was poured from a height into a crucible to introduce bifilms into the melt. The melt was then either remained stagnant or mechanically stirred, and RPT samples were taken from the melt at 8 min intervals. The RPT samples were then characterised by determination of their porosity parameters and examination of the internal surfaces of the pores using a scanning electron microscope. The results showed that stirring of the melt facilitated the diffusion of H in the melt into the atmosphere of the defects and hence accelerated the removal of the defects from the melt by floatation. This effect was attributed to the increase in the stress induced to the defects, which increased the rate of formation of cracks on their layers.

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Section: Introductionmentioning

confidence: 87%

Effect of stirring on behaviour of double oxide film defects in A356 aluminium melt

Ahmadpour

Raiszadeh

Doostmohammadi

2014

International Journal of Cast Metals Research

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“…This defect is formed when the surface of the liquid metal folds upon itself during turbulent pouring, and a volume of air is trapped between the two unwetted sides of the oxide films that come into contact with each other. This defect, which was not recognised for many years due to its extremely small thickness, has nowadays grabbed the attention of many researchers, who have studied its formation, 1-3 influence on mechanical properties of solidified casting, 4-6 behaviour in liquid metals, [7][8][9] healing mechanism in different alloys [10][11][12][13][14] and elimination from the melt. 15,16 The role of double oxide film defects in the formation of hydrogen pores in aluminium castings was first suggested by Campbell, 1 who calculated the pressure required for homogeneous nucleation of an H bubble in liquid Al melt to be extremely high (i.e.…”

Section: Introductionmentioning

confidence: 99%

Effect of dissolved hydrogen on removal of double oxide film defects from Al melt

Chegini

Raiszadeh

2014

International Journal of Cast Metals Research

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Effect of increasing the hydrogen content of the melt on the removal of double oxide (bifilm) defects in commercial purity Al melt was investigated using Weibull statistical analysis of mechanical properties of solidified castings and a semiempirical mathematical model that had been developed previously. The results of the Weibull analysis revealed that increasing the H content of the melt from 0?2 to 0?4 mL/100 g and holding the melt in furnace for 30 min caused the Weibull modulus of the casting to increase by ,73%. Studies (SEM and EDX) of fracture surfaces of the test bars indicated that the number of oxide defects in the melt decreased due to this treatment. The mathematical model suggested that increasing the H content of the melt to ,0?8 mL/100 g would force all the oxide defects to expand rapidly and float out of the liquid metal in a very short time.

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Solidification characteristics of Al–Si–Mg–Fe/Al2O3 metal matrix composites

Petrič

Medved

Dolenc

et al. 2015

J Therm Anal Calorim

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Calorimetric study of the oxidation of Al–Mg alloys for the prediction of healing of the double oxide film defect

Cited by 10 publications

References 18 publications

Effect of stirring on behaviour of double oxide film defects in A356 aluminium melt

Effect of stirring on behaviour of double oxide film defects in A356 aluminium melt

Effect of dissolved hydrogen on removal of double oxide film defects from Al melt

Solidification characteristics of Al–Si–Mg–Fe/Al2O3 metal matrix composites

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