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用正電子湮沒技術(shù)研究鋅液對鈦鋁基合金的腐蝕
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TG146.2

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國家自然科學(xué)基金資助項目(50274005)


Investigation on Liquid Zinc Corrosion of TiAI Alloy by Positron Annihilation
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    摘要:

    研究了Ti-50AI和Ti-45Al-8Nb合金在鋅液中的腐蝕行為，并測量Ti-50Al和Ti-45Al-8Nb合金的正電子壽命譜，利用正電子壽命參數(shù)分別計算了合金基體和缺陷態(tài)的自由電子密度。TiAl合金自由電子密度比金屬Ti和金屬Al基體的低，當(dāng)Ti和Al組成TiAl合金時，Ti原子和A1原子的部分價電子被局域化，TiAl合金中金屬鍵和其價鍵共存。TiAl合金晶界缺陷的開空間較大，晶界缺陷處的自由電子密度較低，金屬鍵結(jié)合力較弱。在TiAl合金中加入Nb元素，Ti-45A1-8Nb合金基體和晶界的自由電子密度增大，明顯減慢了鋅液對鈦鋁基合金的溶解速度。

    Abstract:

    The static isothermal corrosions of Ti-50A1 and Ti-45A1-8Nb alloys in liquid zinc were studied and their positron lifetime spectrums were measured. The densities of free electrons of the bulk and microdefects in these alloys were calculated by using the positron lifetime parameters. It is found that the density of free electrons is lower in the bulk TiAl alloy than in Ti or Al matrix due to the localization and aggregation of some valence electrons in Ti and Al atoms to form TiAl alloy with a mixture bond of metallic bond and covalent bond. The large open defects occurs in the grain boundary of TiAl alloy and the bonding strength of grain boundary is weak due to the low density of free electrons. Then the densities of free electrons in the bulk and the grain boundary will simultaneously increase due to the great decrease of dissolution rate in liquid zinc as the TiAl alloy is alloyed with Nb

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王文俊 林均品 王艷麗 陳國良.用正電子湮沒技術(shù)研究鋅液對鈦鋁基合金的腐蝕[J].稀有金屬材料與工程,2007,36(6):994~997.[Wang Wenjun, Lin Junpin, Wang Yanli, Chen Guoliang. Investigation on Liquid Zinc Corrosion of TiAI Alloy by Positron Annihilation[J]. Rare Metal Materials and Engineering,2007,36(6):994~997.]
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  • 最后修改日期:2006-05-22
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