Investigation of Local Deformation Behaviour of Metallic Materials and Recent Research Trends: A Review

Abstract

The behaviour and performance of complex metallic materials (e.g., advanced high strength steel and dual phase Ti alloys) are acknowledged to be multi-scale in nature and to rely on the details of the threedimensional morphology, chemistry and crystallography at the meso-scale level and on macro-scale level geometry and boundary and loading conditions. As those materials often contain a multi-phase and complicated microstructure, it is difficult to fully characterise a material's deformation behaviour with conventional macro-scale testing. Recently, a small-scale testing method has been developed to investigate the local deformation behaviour of metallic materials based on the following core techniques: portable nanoindenation platform for providing a high resolved load-displacement system, focused ion beam (FIB) for fabricating a small-scale geometric specimen and electron backscatter diffraction (EBSD) for characterising microstructure and crystallographic orientation. This method has been combined with further high resolution techniques including HR-EBSD and X-ray micro-Laue diffraction, providing us a rich understanding of the fundamental behaviour of materials on the level of the individual microstructural constituents and potentially strengthening our understanding of materials by relating macro-and micro-scale behaviour. In this review article, we describe the small-scale testing method and further high resolution techniques used to studying complex metallic materials.

In-situ neutron diffraction study of lattice deformation behaviour of commercially pure titanium at cryogenic temperature

“…However, there is an uncertainty of the CRSS for slip systems of α-Ti in low temperature range, because the CRSS values were only estimated by the macroscopic experiments using the bulk samples with a microstructural uncertainty in the last few decades 27 – 29 . Accordingly, the next step is to evaluate the CRSS for slip systems of α-Ti with an appropriate experimental technique 54 at cryogenic temperature.…”

Study of plane strain compression of composite sheets

“…The deformation behavior of multi-layered metals under compression is a complex phenomenon that depends on various factors, such as the material properties of each layer, the friction between layers, and the amount of compression applied [1]. When a metal composite sheet is subjected to plane strain compression, each layer experiences a different degree of deformation due to the differences in material properties, resulting in non-uniform deformation behavior.…”