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000867777 1001_ $$0P:(DE-HGF)0$$aDong, Z. H.$$b0
000867777 245__ $$aVaporization of Ni, Al and Cr in Ni-Base Alloys and Its Influence on Surface Defect Formation During Manufacturing of Single-Crystal Components
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000867777 520__ $$aVaporization and its associated surface defect formation have become one of the most important challenges in manufacturing single-crystal components. During the kinetic-influenced casting and solution heat treatment of Ni-base superalloys, elements undergo processes of vaporization and deposition causing unpredictable defects. To quantitatively examine the vaporization phenomenon, partial vapor pressures of Ni, Al and Cr in Ni-base alloys were measured in the γ phase over the temperature range of 1473 K to 1650 K using Knudsen effusion mass spectrometry. Experimental results showed that the partial pressure of Al is about two orders of magnitude lower than that of Ni and five times lower than that of Cr, revealing that the vaporization of Al is almost negligible compared with those of Ni and Cr at solution heat treatment temperatures. Variation of partial pressures during homogenization of the as-cast Ni-base alloys was measured in long-term isothermal experiments at 1573 K. It was found that Cr vapor pressure decreases by a factor of two in the first 20 hours whereas the Ni and Al remain nearly constant.
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000867777 7001_ $$0P:(DE-Juel1)129739$$aKobertz, D.$$b2
000867777 7001_ $$0P:(DE-HGF)0$$aD’Souza, N.$$b3
000867777 7001_ $$0P:(DE-HGF)0$$aFeng, S.$$b4
000867777 7001_ $$0P:(DE-Juel1)129765$$aMüller, Michael$$b5
000867777 7001_ $$0P:(DE-HGF)0$$aDong, H. B.$$b6$$eCorresponding author
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