Abstract
The paper presents TEM analysis of microstructure, phase composition, and mechanical properties of commercially pure titanium. These properties of two types of grains are compared before and after modification of titanium by aluminum ions, namely: large grains (1.4 μm) and small (0.5 μm) grains. The analysis shows that ion implantation results in a considerable improvement of mechanical properties of both large and small grains throughout their implantation depth. However, with increase of the grain size, the stress in the ion- modified surface layer decreases while in the subsurface layer it increases.
Highlights
The ion-beam treatment of materials as described in works of Gribkov et al [1] and Kurzina et al [2,3] is currently one of the most intensively developing techniques used for the synthesis of new materials
Titanium workpieces were exposed to ion implantation at temperature 623 K, accelerating voltage 50 kV, ionic current density 6.5 mA/cm2, distance 60 cm from the ion-optical system, implantation time 5.25 h, and fluence 1·1018 ion/cm2
The microstructure and phase composition were studied with the EМ-125K transmission electron microscope (TEM) having the accelerating voltage of 120 kV
Summary
The ion-beam treatment of materials as described in works of Gribkov et al [1] and Kurzina et al [2,3] is currently one of the most intensively developing techniques used for the synthesis of new materials. A study of phase formation in implanting aluminum ions in titanium materials having various structural conditions (at micro- and meso-levels) is rather relevant. It is possible to assume that physical processes occurred in materials characterized by a heterogeneous condition, i.e. a presence of both small (up to 0.5 μm) and coarse (up to 0.5-5.0 μm) grains or microor meso-levels, behave differently as compared to those characterized by a homogeneous condition. The aim of this study is to analyse and compare the results of research carried out into the microstructure, phase composition, and strength properties of the yield stress, and titanium target in a poly-grained condition before and after aluminium ion implantation. A poly-grained condition refers to a presence of both small (up to 0.5 μm) and coarse (up to 0.5-5 μm) grains in the material workpiece
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