%0 Journal Article %T Isothermal Crystallization Kinetics of an Amorphous CuTi Alloy %A MIAO Weifang LI Shuling WANG Jingtang State Key Laboratory for RSA %A
苗卫方 %A 李淑苓 %A 王景唐 %J 材料科学技术学报 %D 1992 %I %X Isothermal crystallization kinetics of Cu_(40)Ti_(60)amorphous alloy has been studied using differential scanning calorimetry(DSC).Both as-quenched and pre-annealed ribbons were inves- tigated.For crystallization of as-quenched amor- phous ribbon in Ar,it was found that the kinetics follows Johnson-Mehl-Avrami equation with mean Avrami exponent n=2.58,which indicates that crystallization of amorphous Cu_(40)Ti_(60)is a three-dimensional diffusion controlled growth pro- cess with constant nucleation rate,i.e.,primary crystallization process.The primary phase is the tetragonal CuTi_2.The as-quenched amorphous ribbons were also crystallized in air,the results re- veal that oxidation has no significant influence on crystallization kinetics of amorphous Cu_(40)Ti_(60). The results of crystallization of pre-annealed rib- bons show a decreasing tendency of Avrami expo- nent with increasing pre-anneal time.The local activation energy and local Avrami exponent dur- ing crystallization process of as-quenched amor- phous alloy were also examined. %K crystallization kinetics %K amorphous CuTi alloy %K DSC
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=84529CA2B2E519AC&jid=324DC3CAB22330DB19158AE0A9B7BFA5&aid=8F946368DFCF30A4&yid=F53A2717BDB04D52&vid=5D311CA918CA9A03&iid=38B194292C032A66&sid=2BA123C6EB9D54C2&eid=38685BC770C663F2&journal_id=1005-0302&journal_name=材料科学技术学报&referenced_num=0&reference_num=0