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Surface nanocrystallization by ultrasonic nano-crystal surface modification and its effect on gas nitriding of Ti6Al4V alloy

机译:超声纳米晶表面改性的表面纳米晶化及其对Ti6Al4V合金气体氮化的影响

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摘要

The effects of Ultrasonic Nanocrystal Surface Modification (UNSM) on the gas nitriding behavior of Ti6Al4V alloy have been investigated. Gas nitriding was performed at 700 and 800 °C. The microstructure after UNSM and gas nitriding was characterized using X-ray diffraction, scanning electron microscopy and transmission electron microscopy. Microstructural investigations revealed the formation of an approximately 10 µm thick severe plastic deformation layer as well as nano-grains after UNSM treatment. The UNSM-treated Ti6Al4V alloy formed 0.26 µm and 1.35 µm thick nitride layers after nitriding at 700 °C and 800 °C, respectively, and UNSM resulted in an increased layer thickness relative to untreated samples at both temperatures. The results suggest that nitrogen adsorption and reaction capability were enhanced in the UNSM-treated Ti6Al4V alloy. This enhancement can be attributed to high-density dislocations and grain boundaries that were introduced by UNSM and served as efficient channels for nitrogen diffusion.
机译:研究了超声纳米晶体表面改性(UNSM)对Ti6Al4V合金气体氮化行为的影响。气体氮化是在700和800°C下进行的。使用X射线衍射,扫描电子显微镜和透射电子显微镜对UNSM和气体氮化后的微观结构进行了表征。显微组织研究表明,经UNSM处理后,形成了约10μm厚的严重塑性变形层以及纳米晶粒。经UNSM处理的Ti6Al4V合金在700°C和800°C氮化后分别形成0.26μm和1.35μm厚的氮化物层,并且在两种温度下,UNSM均使未处理样品的层厚增加。结果表明,在经UNSM处理的Ti6Al4V合金中,氮的吸附和反应能力得到增强。这种增强可以归因于UNSM引入的高密度位错和晶界,它们是氮扩散的有效通道。

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