%0 Journal Article
%T EFFECT OF Cu ON MICROSTRUCTURE AND PROPERTIES OF Al-Li ALLOYS
%A YAO Daping HU Zhuangqi LI Yiyi ZHANG Yun SHI Changxu Institute of Metal Resarch
%A Shenyang
%A China Institute of Metal Research
%A Academia Sinica
%A Shenyang
%A China
%A <br>YAO Daping HU Zhuangqi LI Yiyi ZHANG Yun SHI Changxu Institute of Metal Resarch
%A Shenyang
%A China Institute of Metal Research
%A Academia Sinica
%A Shenyang
%A China
%J 金属学报(英文版)
%D 1990
%I 
%X The aging precipitation structure and the properties of Al-Li-Cu-Zr alloys with 3 differentCu/Li ratios have been studied.Experimental results show that the aging hardening of thealloys consists of two steps:The first is strengthened by δ′-phase(δ′+T_1 phase in alloyNo.3),and the second by δ′+T_1 phase(δ′+T_1+θ′phase in alloy No.3).The plate of T_1-phasecan absorb the Li atoms from δ′ particles when the plate bumped into δ′-phase,and therefore,these δ′ phase particles become smaller and gradually disappear.The strength and hardnessincrease with the increase of Cu/Li ratio and cuases a decrease in plasticity.The crack modewould change from transgranular to intergranular.This is due to the precipitation of the equi-librium phases contained Cu at grain boundaries.
%K A1-Li alloy
%K aging hardening
%K microstructure
%K tensile properties<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=C19B08D052F5FD8445F4BB80A1A5D7BF&aid=CA23860DF49551EE975A36C18CBA828A&yid=8D39DA2CB9F38FD0&vid=38B194292C032A66&iid=94C357A881DFC066&sid=3224764AEAFCF8C2&eid=377D325742940769&journal_id=1006-7191&journal_name=金属学报(英文版)&referenced_num=0&reference_num=6