首页|Improving thermal stability and creep resistance by Sc addition in near-α high-temperature titanium alloy
Improving thermal stability and creep resistance by Sc addition in near-α high-temperature titanium alloy
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High-temperature titanium alloys'thermal stability and creep resistance are significant during service in high temperatures.This study systematically investigated the thermal stability and mechanical properties of Ti-6.5Al-2.5Sn-9Zr-0.5Mo-1Nb-1W-0.3Si-xSc(x,0-0.5 wt.％)at 650 ℃.The lamellar secondary α phase is refined and the formation of Sc2O3 is increased with the increasing scandium(Sc)additions,which im-proves the strength of the alloy,while excessive Sc2O3 becomes the crack source and deteriorates the plasticity.The oxygen content in the matrix is reduced by the interaction between Sc and oxygen,in-hibiting the growth of the Ti3Al phase and improving the thermal stability of the alloy.Meanwhile,Sc accelerates the dissolution of the residual β phase and precipitation of fine,diffusely distributed ellip-soidal silicides,which strongly prevents dislocation movement.The enhancement of creep resistance for the Sc-containing alloy is attributed to the refined lamellar secondary α phases,Sc2O3 particles,Ti3Al phase,and silicides,especially the precipitated silicides.Eventually,the 0.3Sc alloy shows optimal ther-mal stability(the plasticity loss rate 17.3％)and creep resistance(steady-state creep rate 4.4 x 10-7 s-1).The investigation results provide new insights into the mechanism and thermal stability improvement in high-temperature titanium alloys modified by rare earth(RE).
Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,China
School of Materials Science and Engineering,Beihang University,Beijing 100191,China
Institute of Metals,College of Materials Science and Engineering,Changsha University of Science & Technology,Changsha 410004,China
Department of Mechanical Engineering,University of Manitoba,Winnipeg,MB R3T 5V6,Canada
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Jiangxi Provincial Natural Science FoundationGanzhou Science and Technology Planning ProjectGraduate Innovation Special Fund Project of Jiangxi Province in 2022
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