%0 Journal Article
%T PRECIPITATION BEHAVIOR OF Co PHASES IN B2-ORDERED(Ni,Co)Al COMPOUND
%A WH Tian
%A AL Fan
%A <br>
%J 金属学报(英文版)
%D 2002
%I 
%X The precipitation behavior of Co phases in B2-ordered (Ni,Co)Al has been investigated in terms of transmission electron microscopy. Fine precipitation of fcc-Co occurs in (Ni,Co)Al by aging at temperature over 973K. The orientation relationship between the fee-Co precipitates and the B2-(Ni,Co)Al matrix follows the Kurdjumow-Sachs (K-S) orientation relation. But when the aging temperature is under 873K the Co precipitates have a hcp crystal structure. The orientation relationship between the hep-Co precipitates and the B2-(Ni,Co)Al matrix follows the Burgers orientation relation. (Ni,Co)Al is hardened appreciably by the fine precipitation of both the fee-Co and hep-Co phases. The temperature dependence of the yield strength of precipitate-containing BS-ordered (Ni, Co)Al was investigated by compression tests over the range of 298-1273K. The fine precipitation of Co phases enhances greatly the low and intermediate temperature yield strength. When the deformation temperature was over 87SK, the strength of precipitate-containing (Ni, Co)Al is comparable to ternary dual-phase (Ni,Co)Al Ni3Al alloy.
%K nickel aluminides
%K age-hardening
%K mechanical properties
%K precipitates<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=C19B08D052F5FD8445F4BB80A1A5D7BF&aid=E82030C215230CAC4ACE3A2A4F0830D4&yid=C3ACC247184A22C1&vid=23CCDDCD68FFCC2F&iid=38B194292C032A66&sid=82722E2B785EBF0D&eid=0F7768518993EDDE&journal_id=1006-7191&journal_name=金属学报(英文版)&referenced_num=0&reference_num=10