J Mater Sci Technol ›› 1990, Vol. 6 ›› Issue (4): 263-267.

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δ′ Phase Precipitation at Low-angle Grain Boundary in Al-Li-Zn-Zr Alloy

JIANG Xiaojun YAO Daping LI Yiyi Institute of Metal Research,Academia Sinica,Shenyang,110015,China.   

  • Received:1990-07-28 Revised:1990-07-28 Online:1990-07-28 Published:2009-10-10

Abstract: A large number of δ particles precipitated at low-angle grain boundaries have been observed by TEM in a dilute A1-Li-Zn-Zr alloy during ageing at the suitable temperatures.An explanation for this phenomenon was proposed,which involves the role of excess vacancies and capillarity effects.

Key words: Al-Li alloy, phase transformation, precipitation