High Energy Surface Implantation by Ion Nitrogen of Ultra- Fine Grained Ti-6Al-4V Alloy for Engineering Application

Abstract

This paper aims to study the peculiarities of a modified layer in the surface of ultrafine-grained (UFG) Ti-6Al-4V alloy after high energy ion nitrogen implantation. The UFG structure in the alloy was produced by equal channel angular pressing. X-ray diffraction analysis and scratch-testing were applied for the investigation. The influence of low-temperature annealing (400°C during 1 hour) on the substructure parameters and phase composition of the surface layer depending on a number of cycles of ion implantation with annealing was shown in the research. The effect of the UFG structure on mechanisms and strengthening degree of the surface after ion implantation is discussed.

Microstructural Features and Surface Hardening of Ultrafine-Grained Ti-6Al-4V Alloy through Plasma Electrolytic Polishing and Nitrogen Ion Implantation

“…The formation of highly dispersed segregations and nitride phases is confirmed by X-ray diffraction analysis, according to the results of which, an average of 0.10-0.12% nitride phases was found in the irradiated surface of the CG and UFG substrates. A similar result was obtained in our recent work [27].…”

“…The hardening of the UFG surface depends on treatment conditions (annealing before or after ion implantation, number of implantation cycles). It was demonstrated in [27] that a three-time iteration of the cycle (ii + annealing) resulted in the maximum concen-tration of nitride phases (~0.28%). Subsequent low-temperature annealing (to 400 • C) after ion implantation can lead to the formation of more equilibrium and an ordered grain boundary structure, and, consequently, to the enhancement of both strength and ductile properties [27].…”

Slope Topography Monitoring Based on UAV Tilt Photography Technology and Sensor Technology

“…Through the comparison between the attitude measured by 20 compasses and the attitude calculated according to the point cloud coordinates [24,25], it can be found that the average absolute error of inclination is 4.00 °, and the average absolute error of inclination is 2.29 °. The attitude results obtained by the two measurement methods are basically the same, so the attitude calculated by reconstructing the point cloud by UAV photography is reliable.…”