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Moscow, Russia

Results of a study of regular features of formation of phase composition and of evolution of the structure and phase composition of an alloy of the Mg - Zn - Zr - Y system in cast, deformed and heat treated states are presented. It is established that the primary intermetallic phases are preserved in the alloy after deformation and heat treatment. Yttrium is shown to be an active phase-forming element just like zirconium. It is proved that the atoms of admixtures (such as H, N and O) in the Mg - Zn - Zr - Y alloy participate in the formation of the phase composition. The low anisotropy of the main mechanical properties of extruded bars from the alloy is explained. © 2014 Springer Science+Business Media New York.

Shamrai V.F.,RAS Institute of Metallurgy | Klochkova Y.Y.,FGUP VIAM | Lazarev E.M.,RAS Institute of Metallurgy | Gordeev A.S.,RAS Institute of Metallurgy | Sirotinkin V.P.,RAS Institute of Metallurgy
Russian Metallurgy (Metally) | Year: 2013

The texture and microstructure of the central layers in alloy 1469 sheets and the orientations of hardening T1-phase precipitates are studied by X-ray diffraction, optical microscopy, and transmission electron microscopy. These studies and X-ray diffraction performed in asymmetric geometry demonstrate that the texture of the material is formed by the broadening of the orientations located near a β skeleton line. The contribution to an X-ray diffraction pattern from two of the four possible versions of the orientations of hardening T1-phase plates that are caused by a brass-type texture component in the matrix and the orientation relationships between the matrix and the T1-phase lattices is separated. The microstructure of the sheets is shown to have a two-level character. It is formed by extended (up to several millimeters long) regions fragmented into grains several microns in size. The structural states of the sheet material are discussed in their relation to the crystallographic character of fatigue crack propagation. © 2013 Pleiades Publishing, Ltd.

Zhegina I.P.,FGUP VIAM | Morozova L.V.,FGUP VIAM
Metal Science and Heat Treatment | Year: 2014

Fracture surfaces of aluminum alloys VAD23, AK6, V95, 01911, 1420, 1430, 1440, 1451 are studied after different variants of aging. Common features of formation of fractures are determined depending on the modes of heat treatment, conditions of deformation and presence of impurities in the aluminum alloys. Efficiency of the use of fractography for estimating the working capacity of the aluminum alloys is demonstrated. © 2014 Springer Science+Business Media New York.

Klochkov G.G.,FGUP VIAM | Grushko O.E.,FGUP VIAM | Ovsyannikov B.V.,KUMZ Company | Popov V.I.,FGUP VIAM
Metal Science and Heat Treatment | Year: 2015

Production of ingots and commercial-size sheets from an Al-Mg-Si-base alloy V-1341 with calcium addition is described. Their structure, phase composition and mechanical properties are studied. It is shown that calcium enters primarily phases Alx-SiyCa and Alx SiyMgzCa of variable composition. © 2015 Springer Science + Business Media New York.

Belyaev M.S.,FGUP VIAM | Terent'ev V.F.,RAS Institute of Metallurgy | Bakradze M.M.,FGUP VIAM | Gorbovets M.A.,FGUP VIAM | Gol'dberg M.A.,RAS Institute of Metallurgy
Russian Metallurgy (Metally) | Year: 2015

The low-cycle fatigue of a VZh175 nickel superalloy is studied under conditions of complete deformation per loading cycle at an initial cycle asymmetry R = 0, a deformation amplitude ɛa = 0.4–0.6%, and a temperature of 20 and 650°C. The specific features of cyclic hardening/softening of the alloy under these conditions are detected. The mechanisms of fatigue crack nucleation and growth are analyzed as functions of the deformation amplitude and the test temperature. © 2015, Pleiades Publishing, Ltd.

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