We link different microstructures to tribological behaviors of Ti-50.8 Ni(mole fraction,%)in reciprocating mode at room temperature(20℃).Hot-rolled alloys with B2 phase exhibit lower coefficient of friction and wear ...We link different microstructures to tribological behaviors of Ti-50.8 Ni(mole fraction,%)in reciprocating mode at room temperature(20℃).Hot-rolled alloys with B2 phase exhibit lower coefficient of friction and wear rate compared to the ones with B19?.Stress-induced martensitic transformation occurs during sliding.However,multi-pass hot rolling weakens the wear resistance.In this study,microstructures were characterized through electron backscatter diffraction and transmission electron microscopy(EBSD/TEM).From the concept of energy conservation,the effects of weak intensity of hot-rolled textures on the wear resistance are minimal.Based on the result that the alloy with a higher portion of coincidence site lattice boundaries shows lower martensitic start transformation temperature in the DSC curves than that with higher KAM values,the delay on B2-B19?transformation from{112}B2 twins outweighs dislocations.Moreover,widely distributed small-angle grain boundaries owing to dynamic recovery improve the wear resistance effectively compared to those that are well-recrystallized.展开更多
基金financially supported by the National Natural Science Foundation of China-Aerospace Science and Technology Corporation of China Aerospace Advanced Manufacturing Technology Research Joint Fund(U1737204)the National Natural Science Foundation of China(51673205)the Key Research Program of Frontier Science,Chinese Academy of Sciences(QYZDJ-SSW-SLH056)。
文摘We link different microstructures to tribological behaviors of Ti-50.8 Ni(mole fraction,%)in reciprocating mode at room temperature(20℃).Hot-rolled alloys with B2 phase exhibit lower coefficient of friction and wear rate compared to the ones with B19?.Stress-induced martensitic transformation occurs during sliding.However,multi-pass hot rolling weakens the wear resistance.In this study,microstructures were characterized through electron backscatter diffraction and transmission electron microscopy(EBSD/TEM).From the concept of energy conservation,the effects of weak intensity of hot-rolled textures on the wear resistance are minimal.Based on the result that the alloy with a higher portion of coincidence site lattice boundaries shows lower martensitic start transformation temperature in the DSC curves than that with higher KAM values,the delay on B2-B19?transformation from{112}B2 twins outweighs dislocations.Moreover,widely distributed small-angle grain boundaries owing to dynamic recovery improve the wear resistance effectively compared to those that are well-recrystallized.
