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热轧对Ti-50.8Ni合金显微组织及摩擦学行为的影响

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研究室温下不同显微组织Ti-Ni50.8(摩尔分数,％)合金在往复运动模式下的摩擦学行为.与B19'相合金相比,热变形后奥氏体(B2)合金滑动过程中发生应力诱发马氏体相变,摩擦因数减小,耐磨性提高,但是多次热轧却降低合金的耐磨性.采用背散射电子衍射(EBSD)及透射电镜(TEM)对显微组织进行分析,结合相变能量损耗表明:强度较弱的热轧显微织构对其耐磨性的影响较小;奥氏体中{112}孪晶对B2-B19'相变的抑制作用明显强于高密度位错,与高KAM值的组织相比,合金中较高的重合位置点阵晶界可降低其马氏体相变开始温度.动态回复产生的大量小角度晶界和动态再结晶组织相当,可有效提高合金的耐磨性.
Effect of hot rolling on microstructure and tribology behaviors of Ti-50.8Ni alloy
We link different microstructures to tribological behaviors of Ti-50.8Ni (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.

Ti-50.8Ni alloytribological performancesmall angle grain boundariescoincidence site lattice (CSL) boundary

杨蕊、马巍、王超、王廷梅、王齐华

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中国科学院 兰州化学物理研究所 固体润滑国家重点实验室,兰州 730000

中国科学院 材料科学与光电工程中心,北京 100049

Ti-Ni50.8合金 摩擦学性能 小角度晶界 重合位置点阵CSL晶界

This research was financially supported by the National Natural Science Foundation of China-Aerospace Science and Technology CorNational Natural Science Foundation of ChinaKey Research Program of Frontier Science,Chinese Academy of Sciences

U173720451673205QYZDJ-SSW-SLH056

2021

10.1016/S1003-6326(21)65553-X

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(4)
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