%0 Journal Article
%T INVESTIGATION OF BEHAVIOUR OF B IN Ni_3AI ALLOYS BY POSITRON ANNIHILATION TECHNIQUE<br>用正电子湮没技术研究硼在Ni3Al中的存在形式
%A DENG Wen
%A XIONG Liangyue
%A LONG Qiwei
%A WANG Shuhe
%A GUO Jianting
%A <br>邓文
%A 熊良钺
%A 龙期威
%A 王淑荷
%A 郭建亭
%J 金属学报
%D 1992
%I 
%X The behaviour of B atoms added to mono- and poly-crystalline Ni_3Al alloys has been investigated by positron annihilation technique. If an additive of B less than 1.37 at.-%, some of B atoms solid-dissolved interstitially into matrix and distorted the lattice, thus the lifetime of positron in matrix dilated; the others of them segregated on vacancy-like defects and formed" filling effect", thus the mean lifetime and S parameters decreased. If B added up to 2.22 at.-%, more defects having larger free volume were induced by boride eutectic occurred along grain boundaries and grain interior, thus the positron lifetime in vacancy-like defects, mean lifetime and S parameters increased remarkably.
%K Ni_3Al
%K positron annihilation
%K B additive
%K defect<br>Ni3Al
%K 正电子湮没
%K 硼含量
%K 缺陷
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=B061E1135F1CBDEE96CD96C109FEAD65&aid=875CFEB4F4025938AAE24888FC34ED11&yid=F53A2717BDB04D52&vid=D3E34374A0D77D7F&iid=F3090AE9B60B7ED1&sid=659D3B06EBF534A7&eid=B91E8C6D6FE990DB&journal_id=0412-1961&journal_name=金属学报&referenced_num=0&reference_num=7