SUN Yufeng
,
CAO Chunxiao
,
CAO Jingxia
,
YAN Minggao (Beijing Institute of Aeronautical Materials
,
Beijing
,
100095)
,
P.R.China
金属学报(英文版)
In the present paper,the development of Ti3Al-Nb-Mo-Si alloys for high oxidation resistance is reviewed.Beside of weight gain of alloys with different Nb and Si addition is tested,the evaluation of comprehensive mechanical properties has been taken,include the room-temperature and 700℃ tensile properties,thermal stability,creep rupture and fracture toughness of the alloys,It has shown that the oxidation resistance and mechanical properties were significantly affected by the variation of Nb and Si contents.The composition with the best balance of properties is Ti-24Al-13Nb-1.5Mo-0.5Si and Ti-24Al-15Nb-1.5Mo,which is mush higher than that of Super,α_2 alloy (Ti-25Al-10Nb-3V-1Mo).
关键词:
:Ti_3Al alloy
,
null
,
null
孙福生
,
高文
,
曹春晓
金属学报
利用透射电子显微镜，采用双倾双束技术和ｇ·ｂ不可见判据，分析了Ｔｉ－２５Ａｌ－１０Ｎｂ－３Ｖ－１Ｍｏ（ａｔ．－％）合金中α_２相（Ｄ０_（１９）结构）在２５—７００℃拉伸形变时的位错类型和滑移系．结果表明：室温拉伸形变主要源于ａ型位错在棱柱面或基面滑移，如〈１１０〉｛１００｝，〈１１０〉｛０００１｝；和少量＋／２型位错对在棱锥面滑移，如〈１１６〉｛２０１｝；＋／２，型位错密度随形变温度提高而减少，４００℃拉伸形变时出现大量孪晶；７００℃形变时没有＋／２型位错对出现，开动的是主要型位错在棱柱面、基面滑移和型位错对在棱锥面滑移，如〈１１０〉｛２１０｝．
关键词:
Ｔｉ_３Ａｌ基合金
,
deformation temperature
,
slip system
