%0 Journal Article
%T STUDY ON AGING PRECIPITATION BEHAVIOR OF Al–5.2Cu–0.4Mg–1.02Ag ALLOY<br>
%A LEI Wenping
%A SHEN Jian
%A MAO Baiping
%A LI Junpeng
%A YAN Liangming
%A <br>
%J 金属学报
%D 2009
%I 
%X The mechanical properties and microstructures of Al–5.2Cu–0.4Mg–1.02Ag alloy during different aging processes were studied. The nucleation and coarsening of the main precipitation Ω phase were investigated, and the concentration ledge coarsening mechanism was proposed. The results show that the main precipitated phases are Ω phase and θ phaseA large number of fine Ωphase precipitates but a small amount of θ phase precipitates are found in the underaged alloyAt peak–aging, the volume fraction of both Ω phase and θ phase increases significantly and Ω phase issemi–coherent with the matrix. The equilibrium θ phase is found in subsequent overaging. During this time, Ω phase grows slowly but θ phase quickly both in length and thickness. Each of Mg/Ag co–clusters is used as a nucleation site of Ω phase in initial aging stage. The driving force for Ω phase coarsening comes from ledge migration caused by the atomic concentration difference of Mg, Ag and Cu. Since the segregation of Ag and Mg atoms in the interface between Ω phase and matrix reduces the misfit energy of lattice, the velocity of Cu atom moving to Ω phase is limited and Ω phase can keep its platelet shape well and the cohesion destabilization does not occur in long term aging.
%K Al&ndash
%K 5
%K 2Cu&ndash
%K 0
%K 4Mg&ndash
%K 1
%K 02Ag alloy
%K mechanical properties
%K precipitation
%K &Omega
%K phase
%K coarsening<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=B061E1135F1CBDEE96CD96C109FEAD65&aid=EC6391B0BB9FCFE2C000070E251E0143&yid=DE12191FBD62783C&vid=94E7F66E6C42FA23&iid=94C357A881DFC066&sid=57EA20F731155703&eid=E04FC1B5BC47587B&journal_id=0412-1961&journal_name=金属学报&referenced_num=0&reference_num=17