In this work, Ti–23Nb–0.7Ta–2Zr (TNTZ) and gum metal Ti–23Nb–0.7Ta–2Zr–1.2O (TNTZ-O) alloys were synthesized by cold crucible levitation melting with the objective of investigating the influence of oxygen on the deformation mechanisms. By tensile tests, electron backscatter diffraction, atomic force microscopy and transmission electron microscopy analyses, we showed that the deformation in the ...

To determine flow curves of a material, whose plastic deformation is produced by martensitic transformation, transformation strains of a martensite plate must be characterized [1–3]. Most studies along this line adopt results obtained by the phenomenological crystallographic theory of martensitic transformation [4,5]. The theory is based on finite deformation analysis, which needs involved comp...

An open question is the underlying mechanisms for a recent discovered nanocomposite, which composed of shape memory alloy (SMA) matrix with embedded metallic nanowires (NWs), demonstrating novel mechanical properties, such as large quasi-linear elastic strain, low Young's modulus and high yield strength. We use finite element simulations to investigate the interplay between the superelasticity ...

The production of complex multi-functional, high-strength parts is becoming increasingly important in the industry. Especially with small batch size, incremental flow forming processes can be advantageous. geometry and locally graded material properties currently depicts a great challenge process. At this point, usage closed-loop control for shape could feasible new solution. overall aim projec...

Stellite 6 (Co-29.5%Cr-5%W-1.2%C in wt%) is traditionally used as a hardfacing material the primary circuit of pressurised water reactors (PWRs) due to its good corrosion and wear resistance at up 300 °C. In this study, pin-on-disc type sliding contact tribocorrosion testing was conducted on HIPed 20 °C 250 using bespoke tribometer simulate environment. Transmission electron microscopy (TEM), s...

The effect of deformation temperature on the mechanical properties 1-GPa-grade TRIP steels with different retained austenite (?R) morphologies was studied. dependence deformation-induced martensitic transformation behavior also investigated. uniform elongation below room relatively large in needle-like ?R steel, whereas tensile strength at each almost same as it independent morphology. better s...

The hydrogen desorption behaviors of the SUS304 and SUS316L austenitic stainless steels during deformation at ambient temperature were investigated using a tensile test machine in vacuum chamber equipped with mass spectrometer. Obvious was detected only steel, which exhibited distinct martensitic transformation. Because rate decreased when stopped, significant factor causing transformation-indu...

This paper describes an experimental study of stress-induced martensitic phase transformation in the SMA Nickel-Titanium. The rich local thermo-mechanical interactions that underlie transformation are examined using three-dimensional Digital Image Correlation (strain fields) and infrared imaging (thermal fields). We quantify the complex local interactions between released/absorbed latent heat a...