In situ observation of a phase transformation during annealing of Si containing diamond-cubic (dc) and metastable phases has been performed using synchrotron X-ray diffraction Metastable body-cent

Synchrotron X-ray diffraction observation of phase transformation during annealing of Si processed by high-pressure torsion

Phase transformations in Al-Ti-Mg powders consolidated by high-pressure torsion: Experiments and first-principles calculations

Aluminum (Al) and titanium (Ti) are superconducting materials but their superconducting transition temperatures ([Formula: see text]) are quite low as 1.20 and 0.39 K, respectively, while magnesium (Mg) never exhibits superconductivity. In this study, we explored new superconductors with higher [Formula: see text] in the Al–Mg–Ti ternary system, along with the prediction using machine learning. High-pressure torsion (HPT) is utilized to produce the superconducting states. While performing AC magnetization measurements, we found, for the first time, superconducting states with [Formula: see text] and 7.3 K for a composition of Al:Ti = 1:2. The magnetic anomalies appeared more sharply when the sample was processed by HPT at 573 K than at room temperature, and the anomalies exhibited DC magnetic field dependence characteristic of superconductivity. Magnetic anomalies also appeared at [Formula: see text]55 and [Formula: see text]93 K, being supported by the prediction using the machine learning for the Al–Ti–O system, and this suggests that Al–Ti oxides play an important role in the advent of such anomalies but that the addition of Mg could be less effective.

Achieving superconductivity with higher Tc in lightweight Al–Ti–Mg alloys: Prediction using machine learning and synthesis via high-pressure torsion process

A titanium-iron intermetallic with minor addition of manganese (TiFe0.7Mn0.3) was processed by severe plastic deformation through high-pressure sliding (HPS). A rectangular strip sample was embedded in stainless steel and strained under a pressure of 4 GPa at room temperature. The hydrogen storage kinetics and activation of the HPS-processed sample were significantly enhanced in comparison with the as-received ingot without the HPS processing. 

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Enhancement of Hydrogen Storage Kinetics of TiFe(Mn) Using High-Pressure Sliding (HPS) Process

Simultaneous enhancement of strength and ductility in nonflammable Mg alloys through dynamic precipitation using severe plastic deformation under high pressure

1Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan 2Magnesium Research Center, Kumamoto University, Kumamoto 860-8555, Japan 3Synchrotron Light Application Center, Saga University, Saga 840-8502, Japan 4Department of Materials Science and Engineering, Kyushu University, Fukuoka 819-0395, Japan 5Department of Mechanical Engineering and Materials Science, Yokohama National University, Yokohama 240-8501, Japan 6Japan Synchrotron Radiation Research Institute, Hyogo 679-5198, Japan

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Daisuke Maruno

Papers

In situ synchrotron X-ray analysis: Application of high-pressure sliding process to Ti allotropic transformation