PRECIPITATION AND GROWTH OF δ'- PHASE IN 8090 Al-Li ALLOY
ZHANG Wanming;ZHANG Yun;HU Zhuangqi;LIU Yulin;ZHAO Hong'en(Institute of Metal Research;Chinese Academy of Sciences;Shenyang 110015)(Institute of Metal Research; Chinese Acadeiny of Sciences;Shenyang110015)(Manuscript received 1995-12-15;in revised form 1996-06-19)
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ZHANG Wanming;ZHANG Yun;HU Zhuangqi;LIU Yulin;ZHAO Hong'en(Institute of Metal Research;Chinese Academy of Sciences;Shenyang 110015)(Institute of Metal Research; Chinese Acadeiny of Sciences;Shenyang110015)(Manuscript received 1995-12-15;in revised form 1996-06-19). PRECIPITATION AND GROWTH OF δ'- PHASE IN 8090 Al-Li ALLOY. Acta Metall Sin, 1996, 32(10): 1014-1018.
Abstract The processes of the precipitation and growth of δ'-phase(Al3Li) in an 8090 Al-Li alloy(Al-2.45Li-1.21 Cu-1.20Mg-0.15Zr) under different heat-treatments have been studied by TEM and image analyses.The results show that the growth of δ'-phase,the main strenthening phase in the alloy,consists of rapid and slow stages during aging at 160℃.The relationship between r3(r being the radius of δ'-particle) and aging time is not linear.As an analytical result,the value of k in LSW model may decrease as the vacancy concentration reduces.