Preparation, Microstructure and Properties of High-performance Gradient Nanostructured Pure Ti Plate by USSR

doi:10.3901/JME.2024.06.227

Abstract

Abstract: Low strength greatly limits the application of industrial pure titanium. High-performance pure titanium plates with high strength, corrosion resistance, and smooth surface are prepared through ultrasonic severe surface rolling (USSR). The results indicate that a gradient hardening layer with a thickness of 1.3 mm and a smooth surface with a good mirror effect is obtained by the single-pass USSR process. The USSR sample has a gradient nanostructured surface layer, that is, the grain size, dislocation, and twin density change with the depth, and the grain size of the topmost surface layer is 52.2 nm. Compared with the unprocessed sample, the yield strength and tensile strength of the USSR sample increase by 33.8% and 10.9%, respectively, and the surface hardness increases by 50.9%. Meanwhile, the elongation to fracture of the USSR sample still maintains at 20.8%. Moreover, the passivation current density of pure titanium in Hank’s solution decreases and polarization resistance increases after USSR, giving rise to the improved stability of passivation film and passivation ability. The high strength of USSR sample is mainly derived from grain boundary strengthening, dislocation strengthening, twin strengthening, and hetero-deformation induced strengthening. The high-density non-equilibrium grain boundaries and smooth surface caused by the surface nanocrystalline are beneficial to the formation of stable passivation film, thus improving the passivation ability of pure titanium. The results provide a new idea for improving the mechanical properties and corrosion resistance of industrial pure titanium.

Key words: Ti, gradient nanostructure, strength, plasticity, corrosion resistance, surface strengthening

CLC Number:

TG111

HAN Jing, ZHANG Zheng, SONG Yuanming, SUN Qisheng, LIU Zhiyuan, SUN Jiapeng, CAO Chao, ZHAO Jiyun. Preparation, Microstructure and Properties of High-performance Gradient Nanostructured Pure Ti Plate by USSR[J]. Journal of Mechanical Engineering, 2024, 60(6): 227-235.

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