Refractory CrMoNbWV High-Entropy Alloy Manufactured by Mechanical Alloying and Spark Plasma Sintering: Evolution of Microstructure and Properties.

In this study, bulk samples of a CrMoNbWV high-entropy alloy (HEA) were obtained for the first time by spark plasma sintering (SPS) of mechanically alloyed (MA) powders at 1200 °C, 1300 °C, and 1400 °C. Microstructure evolution, phase formation as well as wear and corrosion behavior were investigated. The MA powders' phase composition was found to be represented by body-centered-cubic (BCC) solid solution.

Additive Manufacturing of Ti-48Al-2Cr-2Nb Alloy Using Gas Atomized and Mechanically Alloyed Plasma Spheroidized Powders.

In this paper, laser powder-bed fusion (L-PBF) additive manufacturing (AM) with a high-temperature inductive platform preheating was used to fabricate intermetallic TiAl-alloy samples. The gas atomized (GA) and mechanically alloyed plasma spheroidized (MAPS) powders of the Ti-48Al-2Cr-2Nb (at. %) alloy were used as the feedstock material.

From microstructural design to surface engineering: A tailored approach for improving fatigue life of additively manufactured meta-biomaterials.

Recently, lattice titanium manufactured by additive manufacturing (AM) techniques has been utilized in various applications, including biomedical. The effects of topological design and processing parameters on the fatigue behaviour of such meta-biomaterials have been studied before. Most studies show that the fatigue life of additively manufactured lattice structures is limited.

[Results of surgical treatment of cholelithiasis by laparotomic and minimally invasive accesses].

The article presents the results of surgical treatment of 1038 patients with cholelithiasis, acute and chronic calculous cholecystitis and complicated forms of the disease. Operations were performed with traditional laparotomic and minimally invasive approaches. Indications for choosing access, as well as the advantages and disadvantages of various options of surgery in patients with cholelithiasis are discussed.

[Laparoscopic cholecystectomy in case of acute cholecystitis].

The article describes the results of laparoscopic cholecystectomy in patients with acute cholecystitis. 97 patients including 13 men and 84 women aged from 20 to 74 years were included in the study. There was not the conversion to laparotomy and intraoperative complications in all cases.