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J Chin Soc Corr Pro  1991, Vol. 11 Issue (3): 217-224    DOI:
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THE EFFECT OF Nd ON THE ADHERENCE OF OXIDE SCALE FORMED ON Ti-5621S ALLOY
Li Meishuan Li Tiefan and Zhou Longjiang (Corrosion Science Laboratory; Institute of Corrosion and Protection of Metals; Academia Sinica)
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Abstract  The spalling processes of the oxide scales formed on 5621S alloy(Ti-5Al-6Sn-2Zr-1Mo-0. 25Si)and 5621S alloy containing 1%Nd during cooling from 700℃, 800℃,850℃ were studied by using acoustic emission technique. The effect of composite oxide 'pegs' composed mainly of Nd_2O_3 on the adherence of oxide scales was analyzed. The 'pegs' can extend the distance between cracks and retard their movement in the oxide. The results indicate that the adherence of the oxide scale is improved due to the addition of Nd. However,the oxide scale still cracks easily. This is because that the 'pegs' suffer high compressive stress during cooling of specimen. If the 'pegs' are large enough, some of them can serve as centers of crack initiation. The mechanism of crack formation caused by the 'pegs' is also discussed.
Received:  25 June 1991     
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Li Meishuan Li Tiefan and Zhou Longjiang (Corrosion Science Laboratory; Institute of Corrosion and Protection of Metals; Academia Sinica). THE EFFECT OF Nd ON THE ADHERENCE OF OXIDE SCALE FORMED ON Ti-5621S ALLOY. J Chin Soc Corr Pro, 1991, 11(3): 217-224.

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