Time filter

Source Type

Verkhnyaya Pyshma, Russia

Sel'menskikh N.I.,RAS Institute of Metallurgy | Chumarev V.M.,RAS Institute of Metallurgy | Zhidovinova S.V.,RAS Institute of Metallurgy | Pankratov A.A.,RAS Institute of Metallurgy | And 2 more authors.
Russian Journal of Non-Ferrous Metals | Year: 2014

The phase composition, microstructure, and crystal structure of the AMT TU-48-4-366 (Technical Specifications) foundry alloy (which is used as the alloying material when smelting titanium alloys) are investigated by X-ray phase analysis, electron probe microanalysis, and microscopy. Lattice parameters of e{open}, p, and δ phases are calculated and their elemental composition is revealed. No formation of the Mo3Al refractory phase (t m = 2150°C) is observed during the primary crystallization of the Al-Mo-Ti foundry alloy in nonequilibrium conditions. Its presence in the refractory phase in the foundry alloy is caused by secondary crystallization processes, during which an ultradispersed mixture of Mo3Al + Mo3Al8 + TiMoAl6 phases is formed at temperatures 1311 and 1314°C. The ultradispersed silicon-containing σ phase with the Mo2.4Ti2.1Si0.8Al4.7 average composition, which was formed in nonequilibrium crystallization conditions, is revealed. Parameters and interplanar distances of its lattice are determined. It is established that the largest nonuniformity by molybdenum in peritectics of primary crystals occurs at a high crystallization rate, i.e., in the lower part of the Al-Mo-Ti ingot. © 2014 Allerton Press, Inc. Source

Chumarev V.M.,RAS Institute of Metallurgy | Mar'evich V.P.,RAS Institute of Metallurgy | Larionov A.V.,RAS Institute of Metallurgy | Dubrovskii A.Y.,OAO Uralredmet
Inorganic Materials | Year: 2011

Reactions of vanadium, niobium, and tantalum pentoxides with aluminum nitride have been studied using X-ray diffraction. At temperatures from 1000 to 1600°C, we have identified various V, Nb, and Ta nitrides. The composition of the niobium and tantalum nitrides depends on the reaction temperature. The tendency toward nitride formation becomes stronger in the order V 2O 5 > Ta 2O 5 < Nb 2O 5. © 2011 Pleiades Publishing, Ltd. Source

Pan'kov I.A.,OAO Uralredmet | Chumarev V.M.,RAS Institute of Metallurgy | Mar'evich V.P.,RAS Institute of Metallurgy | Sel'menskikh N.I.,RAS Institute of Metallurgy | And 2 more authors.
Russian Metallurgy (Metally) | Year: 2010

Some causes of the formation of refractory phases during making of an Al-Nb-Si master alloy are considered. Chemical analysis, X-ray diffraction, and electron-probe microanalysis of master alloy ingots melted by aluminothermic and aluminocalciumthermic methods demonstrate that partial (up to 5%) substitution of calcium for aluminum in a charge does not degrade the quality of the master alloy. It is experimentally shown that the interaction of NbAl3 and Nb2Al with niobium pentoxide leads to the formation of elemental niobium. The presence of materials containing niobium aluminides in a charge can affect the perfection of the master alloy. © 2010 Pleiades Publishing, Ltd. Source

Kashcheev I.D.,Ural Federal University | Zemlyanoi K.G.,Ural Federal University | Rylov A.N.,OAO Uralredmet | Raikov A.Y.,OAO Uralredmet | And 3 more authors.
Refractories and Industrial Ceramics | Year: 2015

Compositions and manufacturing technology are developed for manufacturing a crucible lining for master alloy preparation by an aluminothermic method. Slag is the main material used for lining manufacture, formed during reduction of aluminum metal oxides containing 80 – 84% α-Al2O3. Charge compositions are developed within which soda and high-alumina cement are tested as binder. The technology is introduced into OAO Uralredmet. © 2015 Springer Science+Business Media New York Source

Rylov A.N.,OAO Uralredmet | Raikov A.Y.,OAO Uralredmet | Martynov A.V.,OAO Uralredmet | Chumarev V.M.,RAS Institute of Metallurgy | And 2 more authors.
Russian Metallurgy (Metally) | Year: 2013

The possibility to use aluminum nitride as a nitriding agent for out-of-furnace aluminothermic melting of V-Al-N master alloys is studied and tested. It has been found that the replacement of nitrided vanadium by aluminum nitride in a charge for melting does not change the phase composition of the master alloy and the uniformity of the distribution of nitride inclusions in the ingot volume. The nitrogen-containing phase of the V-Al-N master alloy is represented by aluminum nitride. The mean values of the structural parameters of the master alloys melted from charges containing nitrided vanadium or aluminum nitride are identical. © 2013 Pleiades Publishing, Ltd. Source

Discover hidden collaborations