%0 Journal Article
%T EFFECT OF MARTENSITE ORDERING ON SME IN A Cu-Zn-Al ALLOY
%A QI Xuan JIANG Bohong XU Zuyao
%A <br>QI
%A Xuan
%A JIANG
%A Bohong
%A XU
%A Zuyao
%J 金属学报(英文版)
%D 1989
%I 
%X The correlation between the shape memory effect(SME)and the ordering degree inmartensite formed through various heat-treatment processes,e.g.ice water quenching,step-quenching and aging etc.,has been studied in a Cu-26Zn-4Al alloy.The martensite or-dering degree is estimated by △d,the spacing difference of some pairs of diffracting planeswith indices satisfying a relation of(h_1~2-h_2~2)/3=(k_2~2-k_1~2)/n(n=1 for 9R martensite,n=4for 18R martensite).M 18R martensite is obtained from step-quenching,in which the valueof △d increases with the holding duration of step-quenching,and the shape recoveryrate η increases synchronouslly.9R martensite is obtained from direct water-quenching,thevalue of △d is quite large and SME is also good at just quenching state.But both △dand η decrease continuously with aging time at room temperature.This stabilization phe-nomenon of martensite is explained by the observation of TEM lattice fringe image,and itmay be attributed to the clustering of quenched-in supersaturated vacancies at(001)_M close-packed plane in martensite and decreasing the ordering degree.A reduction in△d and η occuring in the specimens on step-quenching or aging at higher temperature,which may be related to the precipitation of the α-phase and the enrichment of solute atoms,decreases the ordering degree.
%K Cu-Zn-Al alloy
%K martensite
%K ordering
%K shape memory effect
%K stabilization<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=C19B08D052F5FD8445F4BB80A1A5D7BF&aid=B43E448A0C0D0888E87D97DC3DD47CAE&yid=1833A6AA51F779C1&vid=0B39A22176CE99FB&iid=CA4FD0336C81A37A&sid=DF92D298D3FF1E6E&eid=23CCDDCD68FFCC2F&journal_id=1006-7191&journal_name=金属学报(英文版)&referenced_num=0&reference_num=12