Results of a study of the interaction between iron impurity and manganese and aluminum alloying elements during formation of phase composition in alloys of the Mg – Mn, Mg – Al, Mg – Al – Mn, and Mg ...– Al – Zn – Mn systems are presented. It is proved that this interaction results in introduction of Fe into the intermetallic phase. The phase compositions of model magnesium alloys and commercial alloys MA2-1 and MA5 are studied. It is shown that both manganese and aluminum may bind the iron impurity into phases. Composite Fe-containing intermetallic phases of different compositions influence differently the corrosion resistance of magnesium alloys.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Results of a study of the structure, phase composition, and main parameters of high-temperature strength of forgings from deformed magnesium alloy VMD16 of the Mg – Zn – Zr – REE system in aged ...condition are presented. The distinctive features of alloy VMD16 responsible for the thermal stability and high-temperature strength of the alloy are determined, which make it superior to the commercial refractory alloy MA12. It is shown that thermally stable LPSO-phases are present in alloy VMD16 in the form of nanoplates in the bulk of grains and in the form of nanoblocks in multilayer fragments of the eutectic.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
The influence of the features of flux-free melting on the structure and properties of magnesium alloy VMD16 in cast condition is studied. It is shown that the chosen protective atmospheres used in ...the melting lower effectively the presence of harmful impurities in the alloy and improve substantially its corrosion resistance. Independently on the melting conditions, the alloy acquires a specific phase composition. However, the flux-free melting yields a net of nanosize (less than 1 nm) zinc zirconides. The strength characteristics of the alloy in cast condition increase by 9 – 15%.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Three methods for determining the type of LPSO-phases in an Mg-Zn-Y alloy are described: electron diffraction and two methods based on high-resolution image analysis. The diffraction method consists ...in counting the diffraction spot between (000)
Mg
and (00.1)
Mg
reflections; comparison with the calculated diffraction patterns allows determining the mixed types of LPSO-phase. The routine operations with high-resolution imaging using Fourier filtering and building intensity profiles in Digital Micrograph are described in detail. Recommendations on the preferred orientation of the sample for each method are given. The procedure for identifying (00.2)
Mg
layers using template figures and a simplified search for stacking faults in an image using a Fourier mask for reflection
is described. The advantages, possibilities and limitations of each method are discussed.
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BFBNIB, DOBA, GIS, IJS, IZUM, KILJ, KISLJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
Results of a study of the fine structure of an alloy of the Mg – Zn – Zr – REE system proving the presence of nanosize plates of self-organizing LPSO-phases after deformation are presented. The Zn ...and Y hardening elements are redistributed in the periodic rows of the LPSO phases under the effect of the deformation process parameters. The optimum deformation mode of the new alloy provides formation of periodic rows in plates of LPSO phases bearing (3.2 – 4.3) at.% Y and (3.8 – 4.2) at.% Zn.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
The possibility of application of a nonstandard deformation process by the method of hydroextrusion (HE) to commercial high-strength magnesium alloys MA14 and MA22 is studied and proved. It is shown ...that specific modes of HE deformation raise the level of the strength properties of the alloys by 25 – 50% as compared to the standard deformation process.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Results of a study proving formation of long-period stacking ordered (LPSO) phases in the structure of magnesium alloy VMD16 of the Mg – Zn – Zr-system are presented. It is shown that the LPSO-phases ...have the form of plates from 1.5 to 25 nm thick. After a homogenizing annealing, the content of Zn and Y in the LPSO-phases changes. Special features of the morphology of these phases are considered.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
The structure, phase composition, and mechanical and corrosion properties of plates made of a structural aluminum Al–Cu–Mg alloy are studied in its various states. The results obtained are compared ...with the properties of its commercial analog (AK4-1 alloy). The alloy under study is found to surpass its analog in strength properties at room and elevated (up to 175°C) temperatures by 9–12%. The impact toughness KCU of the Al–Cu–Mg alloy is twofold that of the AK4-1 alloy. The increase in the strength and corrosion properties of the alloy after operational heating is shown to be explained by the phase composition and morphology of intermetallic phases, including transition-metal phases, which form in the surface layers of samples in small quantities.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
The influence of high-temperature heating to 350°C on the structure, phase composition, and main mechanical properties of small-sized stampings of a VMD16 magnesium alloy is studied. The action of ...temperature in the range 300–350°C for 1 h is found not to cause marked grain growth and noticeable changes in the phase composition of the alloy. A decrease in the strength properties of the stampings during tension and compression is no higher than 5.6–9.0%. It is confirmed that the high thermal stability of the alloy structure elements, the existence of LPSO phases, the favorable morphology of strengthening-phase particles, and the existence of zirconium (active antisolidification agent) conserve the high mechanical properties of the alloy after the action of temperature in the range 300–350°C for 1 h.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Results of a comparative study of the effects of composition and deformation parameters on the structure and susceptibility of alloys of the Mg – Zn – Zr and Mg – Zn – Zr – REE systems to ...superplastic flow are presented.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
