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51312-01158-The Effect of Crystallization State on the Corrosion Behavior of Al-Ni-Y Glassy Alloys

Picture for The Effect of Crystallization State on the Corrosion Behavior of Al-Ni-Y Glassy Alloys
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Product Number: 51312-01158-SG
ISBN: 01158 2012 CP
Author: Rinkel Jindal
Publication Date: 2012
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Al-Ni-Y alloys processed through the amorphous state exhibit significant improvements in strength over conventional crystalline Al Alloys. As such they may offer some promise in high-strength weight critical applications such as aerospace if their other property combinations are acceptable However amorphous metals are highly non-equilibrium and the problem of their thermal stability has stimulated considerable interest especially in terms of the effects of any partial crystallization on their properties. In this work the influence of controlled states of crystallization on the corrosion resistance of rapidly solidified Al-Ni-Y amorphous ribbons in 3.5 wt. % NaCl (pH 6.5) solution was studied. Differential scanning calorimetry and X-ray diffraction were used to determine the thermal stability of amorphous Al-Ni-Y ribbons. Two types of crystallites fcc-Al and Intermetallic were produced and their effect on corrosion rate was studied by potentiodynamic polarization. The results show that the partial and fully crystallized ribbons exhibit improved corrosion resistance and low passive current density compared with that of as-cast amorphous state. Possible physical origins of these effects are discussed.
Al-Ni-Y alloys processed through the amorphous state exhibit significant improvements in strength over conventional crystalline Al Alloys. As such they may offer some promise in high-strength weight critical applications such as aerospace if their other property combinations are acceptable However amorphous metals are highly non-equilibrium and the problem of their thermal stability has stimulated considerable interest especially in terms of the effects of any partial crystallization on their properties. In this work the influence of controlled states of crystallization on the corrosion resistance of rapidly solidified Al-Ni-Y amorphous ribbons in 3.5 wt. % NaCl (pH 6.5) solution was studied. Differential scanning calorimetry and X-ray diffraction were used to determine the thermal stability of amorphous Al-Ni-Y ribbons. Two types of crystallites fcc-Al and Intermetallic were produced and their effect on corrosion rate was studied by potentiodynamic polarization. The results show that the partial and fully crystallized ribbons exhibit improved corrosion resistance and low passive current density compared with that of as-cast amorphous state. Possible physical origins of these effects are discussed.
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