%0 Journal Article
%T BRITTLE-TO-DUCTILE TRANSITION TEMPERATURE AND ITS STRAIN RAf E SENSITIVITY IN Ti-47Al-2Mn-2Nb-0.8TiB_2
Ti—47Al—2Mn—2Nb—0.8TiB2合金韧脆转变温度及其应变速率敏感性
%A WANG Yu
%A LIN Dongliang
%A T L LIN
%A LIU Junliang
%A C C LAW
%A
王瑜
%A 林栋梁
%A 刘俊亮
%A C.C.Law
%J 金属学报
%D 1998
%I
%X The effect of strain rate on the tensile yield strength and elongation of titanium aluminide has been studied. The alloy has a composition of Ti-47Al-2Mn-2Nb-0.8TiB2 (atomic fraction, %; volume fraction, %, only for TiB2) and near lamellar dricrostructure. It manifests brittle-to-ductile transition (BDT) at elevated temperature and its brittle-to-ductile transition temperature (TBDT) is positively sensitive to the strain rate. The addition of boron lowers the TBDT considerably, and the corresponding activation energy of BDT decreases to 256 kJ/mol, which is less than that of the alloy without boron (TiB2), but approximates the self-diffusion activation energy of atoms in the TiAl alloy. From additional fractography analysis and theoretical estimation, it is suggested that the BDT course of 7 titanium aluminide with the addition of boron (TiB2) is controlled by dislocation climbing.
%K titanium aluminide
%K intermetullics
%K BDT
%K strain rate
TiAl
%K 金属间化合物
%K 韧脆转变
%K 应变速率
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=B061E1135F1CBDEE96CD96C109FEAD65&aid=5175C9D46105FE5D5BEF3E74F8653FEE&yid=8CAA3A429E3EA654&vid=339D79302DF62549&iid=38B194292C032A66&sid=627456E7977439A4&eid=30897FA31CA3354D&journal_id=0412-1961&journal_name=金属学报&referenced_num=2&reference_num=1