Assessment of Gas Saturation of Titanium Alloys Synthesized From Powders Using Twist Extrusion

• Published in: Powder metallurgy and metal ceramics Vol. 56; no. 5-6; pp. 273 - 282
• Main Author: Pavlenko, D. V.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-09-2017; Springer
• Subjects: Analysis; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Glass; Materials Science; Metal powders; Metallic Materials; Natural Materials; Sintering; Specialty metals industry; Titanium; Titanium alloys; impurity; titanium powder; severe plastic deformation; titanium oxide; nitrogen; powder metallurgy; hydrogen; twist extrusion; oxygen
• ISSN: 1068-1302; 1573-9066
• DOI: 10.1007/s11106-017-9895-3

The gas saturation of semi-finished titanium alloys produced from metal powder using the technique comprising cold pressing, vacuum sintering, and subsequent severe plastic deformation by twist extrusion is analyzed. The main sources are considered and the quantitative analysis of pollution of sintered alloys with nitrogen and oxygen impurities contained in the powder particles on their surface and in the pore spaces of the billet is conducted. It is established that the quality of the starting titanium powder has the biggest impact on the pollution of alloys. It is shown that the use of titanium powders with low content of impurities allows keeping the oxygen and nitrogen content of synthesized semi-finished products at the level meeting the requirements of the reference documentation for VT1-0 titanium and heat-resistant titanium alloys. It is shown that the share of impurities entering the synthesized alloy from (i) the oxides on the powder particle surface and (ii) the air filling the closed pore space of the billet is insignificant.