INFLUENCE OF COLD-WORKING AND HEAT TREATING ON ELASTIC PROPERTIES OF Nb AND Nb-BASE ALLOYS

The elastic limit of single-phase alloy Nb-2Mo-2Zr-1Ti is higher as recovered state incomparison with as cold-rolled or recrystallized one.For Nb-40Ti-5.5AI alloy ofage-hardening type,the elastic limit is lower as cold-rolled state,but increases considerablyafter proper aging.However,its elastic modulus changes no more,so the stored-energy(σ_e~2/E)may raise significantly.The temperature dependence on elastic modulus for pureNb as intensely cold-worked or recrystallized state is anomalous.This anomaly may disap-pear after recovered treatment of intensely cold-worked state at 600℃ for 4 h.and maychange no more after that of recrystallized state.The anomalous behaviour of elasticity wasalso discussed on the non-magnetic Nb.