文档介绍：45 5 2009 5 579—584 ACTA METALLURGICA SINICA May 2009 –584 Al––– ?( , 100088) Al––– , ?, . : ?θ?. ?θ?; ?θ?, ?; θ,?, θ?. Mg/Ag ?;Mg,Ag Cu ?. Mg Ag ?, Cu ?, ?. Al––– , , ,?, A 0412 ?1961(2009)05 ? 0579 ? 06 STUDY ON AGING PRECIPITATION BEHAVIOR OF Al––– ALLOY LEI Wenping, SHEN Jian, MAO Baiping, LI Junpeng, YAN Liangming General Research Institute for Nonferrous Metals, Beijing 100088 Correspondent: SHEN Jian, professor, Tel: (010)82241261 , E-mail: jshen@ Manuscript received 2008–09–17, in revised form 2009–01–21 ABSTRACT The mechanical properties and microstructures of Al––– alloy dur- ing di?erent aging processes were studied. The nu cleation and coarsening of the main precipitation ? phase were investigated, and the concentration ledge coarsening mechanism was proposed. The results show that the main precipitated phases are ? phase and θ?phase A large number of ?ne ? phase precipitates but a small amount of θ?phase precipitates are found in the underaged alloy At peak–aging, the volume fraction of both ? phase and θ?phase increases signi?cantly and ? phase is semi–coherent with the matrix. The equilibrium θphase is found in subsequent overaging. During this time, ? phase grows slowly but θ?phase quickly both in length and thickness. Each of Mg/Ag co–clusters is used as