Elevated Temperature Creep Behavior Of Zirconiumtitanium-based Alloy

With the rapid development of science and technology, especially in the industrialapplications, the traditional materials haven’t been completely to meet the demand ofproductivity and life. At present, the zirconium alloys were always used in the nuclearindustry due to their special neutron absorption in the cross section area, and titaniumalloys were used in spacecraft due to their advantages of lightweight，which has becomean important trend of material research to study zirconium and titanium kin elementsresearch.At the beginning of the experiment, the quasi-static compression strength offurnace-cooled and quenched states Zr-45Ti-5Al-3V and quenched state Zr-35Ti-8Al havebeen conducted under773K,873K and973conditions using Gleeble-3500thermalsimulated testing machine. Secondly, elevated temperature compression creepexperiments were also conducted. According to the creep data, the curves of creeprelationship of strain and time were obtained. The steady-state creep rate, creep index andcreep activation energy were calculated through the creep curves. The results showed thatphase transition existed in the proceeding of compression creep test at773K. Creep strainreduced because of the phase in the elevated temperature turned into phase in ambient.The creep process of Zr-45Ti-5Al-3V was controlled by dislocation movement under twodifferent kinds of different heat treatment. Dislocation slip controlled creep deformationwhen stress index of creep varied from3to4. The dislocation main gathered in phase ofelevated temperature, and phase just had a little dislocation. The phase organizationdemonstrated the creep property was better than that of phase. Quenched Zr-35Ti-8Alalloy was controlled by dislocation at773K and873K at the same with the two states ofZr-45Ti-5Al-3V, and twinning which generated at973K-120MPa, leaded to deformationeasily.