Microstructure of the Al-La-Ni-Fe system

Васильев, А. Л.; Иванова, А. Г.; Bakhteeva, N. D.; Kolobylina, N. N.; Orekhov, A. S.; Presnyakov, M. Yu.; Todorova, E. V.

doi:10.1134/s1063774514060297

Cited by 10 publications

(4 citation statements)

References 20 publications

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“…The crystal structure of these defects can be determined by HAADF STEM technique, the details are presented below. A preliminary study of the quaternary Al8Fe2-xNixLa phase indicated that it exhibited an orthorhombic crystal structure isostructural to Al8Fe2Eu (S.G. Pbam) [53] . Table 2.…”

Section: Resultsmentioning

confidence: 99%

“…6(a) and (b). These defects were described in [53] , however, their is confined within arrows marked by number "2". The model of that defect, which is below denoted as the second type, is presented in Fig.…”

Section: (A)mentioning

confidence: 99%

“…Previously, we performed a preliminary study of quaternary Al-La-Ni-Fe alloys and discovered the Al8Fe2-xNixLa phase [53] , isostructural to Al8Fe2Eu [54] . However, the atomic structure of defects in that phase was not considered.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Peculiarities of Al-Rich Al-La-Ni-Fe Alloys

Vasiliev

Bakhteeva

Presniakov

et al. 2019

Metall Mater Trans A

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The results of a comprehensive microstructural study of ternary and quaternary phases in air cast Al85Ni11-xFexLa4 (where x = 2 and 4 at.%) polycrystalline alloys by means of optical microscopy, scanning electron microscopy, transmission electron microscopy, scanning transmission electron microscopy, energy dispersive X-ray microanalysis, and X-ray diffraction are presented. It was found that these alloys contain several phases, namely fcc-Al, Al11La3, Al3Ni1-xFeх, Al9Ni2-xFex, Al8Fe2-xNixLa and Al3.2Fe1-xNix in the form of δ-layers in the Al8Fe2-xNixLa particles. High density of other defects in the quaternary Al8Fe2-xNixLa particles were found and their formation could be caused by dendritic type of growth of this phase. The crystal structure of all these defects was revealed by high resolution scanning transmission electron microscopy together with atomic resolution energy dispersive X-ray microanalysis. The thermal stability of the ternary and quaternary phases were also studied. The Al8Fe2-xNixLa phase is metastable and undergoes an irrevesable transformation: Al8Fe2-xNixLa→Al9Ni2-xFex +Al11La3.On the basis of all these data, a sequence of solid phase reactions in these alloys during cooling and heating is proposed.

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Section: Resultsmentioning

confidence: 99%

Section: (A)mentioning

confidence: 99%

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Microstructural Peculiarities of Al-Rich Al-La-Ni-Fe Alloys

Vasiliev

Bakhteeva

Presniakov

et al. 2019

Metall Mater Trans A

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“…Al3Fe (Al13Fe4 analog) phase microhardness rate ranges from 800 to 1100 HV, Al3Ni phase -from 700 to 770 HV, and Al9Co2 phase (Al9Fe2-xNix analog [14]) from 650 to 750 HV. Al3Ni2 phase has hardness of 1100 HV according to the data from [15].…”

Section: Results and Its Discussionmentioning

confidence: 99%

Formation of composite structure of amorphous alloy after treatment of different types

Bakhteeva

Todorova

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The dependence of structure and microhardness of aluminium amorphous alloy were investigated and determined on samples after deformation, heat treatment and irradiation with fast carbon ions. IntroductionAluminum alloys are widely utilized as light, high-strength, temperature-resistant and corrosionresistant materials for aviation and aerospace equipment. Aluminum doping with transition and rareearth metals allows to receive amorphous structure during highspeed quenching from liquid state. Amorphous structure is an intermediate stage for amorphous-nanocrystalline composites preparation. Different methods of such structures preparation are known: heat treatment, severe plastic deformation (SPD), pulsed photonic irradiation, laser irradiation, radiation exposure. Ample quantity of scientific work is devoted to amorphous nanocrystalline structures preparation methods consideration. In such a way high deformation rates in event of severe plastic deformation [1-5] provide fine grained structure in alloys including nanoscale multiphase structure with increased strength performance. Scientific work results issued over the last years give an evidence of intense interest both to the new aluminum alloys development and to the formation behavior research of submicro-and nanocrystalline structures in the aluminum-based alloys doped with transition and rare-earth metals [3][4][5][6][7][8][9][10][11]. Amorphous alloys irradiation by high-energy ions is reviewed as one of the nanocrystalline composites preparation methods. Information presented in scientific literature about irradiation influence on amorphous alloys structures is limited and commonly contradictory, irradiation parameters vary in types of particles, energies and fluence.Amorphous alloys structure modification is considered now as a method of simultaneous mechanical properties (such as strength and ductility) enhancement. As aluminum alloys doped with transition metals are embrittled due to bulk large-sized intermetallic compounds allocation, best available compositions pulverization technology development is an actual task for research studies.

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