%0 Journal Article
%T Microscopic Phase-field Simulation of Competition Mechanism Between L12 and D022 Structure in Ni-Cr-Al Alloy
%A Zhong CHU
%A Zheng CHEN
%A Yongxin WANG
%A Yanli LU
%A Yongsheng LI
%A <br>Zhong
%A CHU
%A Zheng
%A CHEN
%A Yongxin
%A WANG
%A Yanli
%A LU
%A Yongsheng
%A LI
%J 材料科学技术学报
%D 2006
%I 
%X Simulations are performed on temporal evolution of atom morphology and ordering parameters of Ni-14.5Cr-16.5 Al alloy during early precipitation process at different temperatures based on microscopic phase-field theory; the relationship between precipitation sequence and mechanism of L12 and D022 structure and precipitation temperature are illuminated. The nonstoichiometric ordered L12 phases appear first with congruent ordering spinodal decomposition mechanism which is then followed by precipitation of D022 phases at ordering domain boundaries of L12 phases by spinodal decomposition mechanism at 1073 K and 1223 K. The nonstoichiometric L12 phases transform to stoichiometric ordering phases gradually. The incubation period of L12 and D022 phases is shorter at 1073 K than that 1223 K, and growth speed is higher at 1073 K. At 1373 K, L12 and D022 phases appear simultaneously by non-classical nucleation and growth mechanism. After that the particles of D022 phases diminish and disappear gradually; L12 phases grow and single L12 phases are remained at last.
%K Ni-Cr-Al
%K Microscopic phase-field model
%K Precipitation
%K Ordering parameter
%K Simulation<br>镍铬铝合金
%K 显微相区模拟
%K 竞争机制
%K L12结构
%K D022结构
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=84529CA2B2E519AC&jid=324DC3CAB22330DB19158AE0A9B7BFA5&aid=D704C238709E9FE81F82D9A10EEEF12F&yid=37904DC365DD7266&vid=BC12EA701C895178&iid=38B194292C032A66&sid=0C3F9E980968AF79&eid=CA9ED1AB4D9E3E04&journal_id=1005-0302&journal_name=材料科学技术学报&referenced_num=0&reference_num=22