微量过渡金属元素对7050铝合金再结晶特性之影响-中国鑛冶工程.PDF

微量過渡金屬元素對7050鋁合金再結晶 特性之影響 Effect of Tra ns it io n Met a l A dd it iv es o n t he Rec ryst a llizat io n characteristics of a 7050 Al Alloy 1 1 1 2 3 3 C.C. Peng, C.K. Cheng, C.F. Yang, F.P. Tseng C.M. Chen, C.H. Chiu Mn Zr Sc In this study transition metals, Mn, Zr and Sc, were (TM) 7050 added in a 7050 Al alloy to study the effect of Al-TM (Dispersoids) compound dispersoids on recrystallization temperature and thermal stability of the alloy. We identified the proper process conditions for the development of various Al-TM dispersoids that improved the thermal stability. The precipitations of Al Mn and Al Zr dispersoids in 7050 alloys containing 6 3 Mn Zr 7050 either Mn or Zr required a special dispersoid precipitation treatment. These dispersoids helped the alloys to exhibit high Al Mn Al Zr recrystallization temperature and to inhibit grain growth 6 3 at high temperature so that a fine grain structure can be 7050 Sc achieved. The 7050 Al alloy containing Sc would precipitate Al3Sc dispersoids properly that did not require a dispersoid Al3Sc precipitation treatment. The Al3Sc dispersoids were very effective to suppress the recrystallization reaction and to Al3Sc inhibit the grain growth at elevated temperatures. When Sc- containing 7050 alloy was processed with the dispersoid 7050 Zr Sc Mn precipitation treatment, the Al3 Sc dispersoids coarsened and its recrystallization temperature decreased significantly. The 7050 Al alloy simultaneously containing Mn, Zr and Sc exhibited the best thermal stability an