Peculiarities of the phase composition and structure of the high-entropy FeWMoCrVSiMnC multicomponent steel

We report on the results of analysis of the phase composition, structure, and hardness of high-entropy FeWMoCrVSiMnC multicomponent steel subjected to synthesis and subsequent thermal treatment. Analysis is carried out using the methods of analytic transmission and scanning structural and orientational electron microscopy, optical metallography, X-ray energy-dispersive spectroscopy, X-ray phase and structural analyses, and Rockwell measurements of hardness. It is found that steel has a high hardness (62 HRC) and is in ultra-fine-disperse composite martensite-multicarbide state. All carbides are distributed uniformly over the steel volume and have nano- and submicrometer scales depending on the carbide type.

     

Application of Isothermal Upset for Megaplastic Deformation of Cu–Al–Ni β Alloys

Technical Physics - Cu–14 wt% Al–4 wt% Ni alloy demonstrating the shape memory effect has been subjected to plastic deformation by means of uniaxial compression (upset). The process has...     

Thermal phase stability of rhombohedral boron nitride

Abstract

Thermal phase stability of rhombohedra] boron nitride has been studied between 0 and 8 GPa from 300 to 2700 K. Analysis of the data obtained points to the decisive role of kinetic factors in the rBN phase transformations, the structure and dispersity of the samples under study being of great importance. rBN phase transformations in the cBN thermodynamic stability region of the equilibrium p,T phase diagram for boron nitride occur according to Ostwald stepwise principle by the rBN→hBN→(wBN)→cBN scheme.     

Influence of Thermomechanical Treatment on Structural-Phase Transformations and Mechanical Properties of the Cu–Al–Ni Shape-Memory Alloys

Russian Physics Journal - Using the methods of optical and electron microscopy and electron and X-ray diffraction analyses, the influence of thermomechanical treatment on the mechanical properties,...     

Peculiarities of Structure and Phase Composition of Ternary NiMn–NiTi Alloys with a Quasi-Binary Cross-Section

Russian Physics Journal - The influence of a chemical composition on the phase composition, stability, and crystal structure type of the austenitic and martensitic ternary NiMn–NiTi alloys...     

High pressure produced textured wurtzitic BN with unusually low thermal stability

Abstract

An abnormally low wBN thermal stability, caused by the imperfection of the structure, has been observed for the material produced under high static pressures from pyrolytic rBN. Endothermic wBN→rBN transformation occurs in 490–710 K range by the inverse crystallographic mechanism.