Results 201 to 210 of about 8,279,692 (223)

Influence of the Ni/Al ratio on Ni–Al mixed oxides and their catalytic properties for ethanol decomposition

Journal of Thermal Analysis and Calorimetry, 2016
The relationship between the properties with the composition of nickel–aluminium mixed oxides was investigated in this work. Ni–Al materials with Ni/Al molar ratios between 0.5 and 9 were synthesised via co-precipitation. The samples were characterised using the following techniques: surface area measurements (S BET ...
Guilherme de Souza, Nilson Romeu Marcilio, Oscar William Perez-Lopez   +2 more
openaire   +1 more source

Modulated structures in Ni–Al–Cr alloy

Journal of Microscopy, 2006
SummaryThe crystal structures of the different modulated and layered martensites in Ni–Al–Cr alloy have been observed. The layered martensite can be well described by the L10 lattice with seven‐layered or five‐layered long‐period stacking of {110} close‐packed planes of the parent phase.
Elzbieta, Jezierska, Mirosław, Pilawa
openaire   +2 more sources

The temporal evolution of the nanostructures of model Ni–Al–Cr and Ni–Al–Cr–Re superalloys

Zeitschrift für Metallkunde, 2005
The temporal evolution of γ'(L1 2 )-precipitates in Ni-5.2 Al-14.2 Cr at.% and Ni-9.5 Al-8.6 Cr-2.0 Re at.% alloys are studied utilizing three-dimensional atom-probe microscopy. For the times investigated (0.0833 to 1024 h), these alloys exhibit a high number density (10 2 2 -10 2 4 m - 3 ) of spheroidal y'-precipitates, 0.45-30 nm in radius.
Kevin E. Yoon, Chantal K. Sudbrack, Ronald D. Noebe, David N. Seidman   +3 more
openaire   +1 more source

Structural features of certain Ni-Al-Ta and Ni-Al-Hf alloys containing the ??- and ? -phases

Journal of Materials Science, 1981
An investigation has been made of the structure of certain alloys of the Ni-Al-Ta and Ni-Al-Hf systems. The compositions chosen for investigation were: Ni-28.75 at% Al-2.5 at% Ta; Ni-26.75 at% Al-2.5 at% Ta; Ni-20.0 at% Al-7.5 at% Ta; Ni-20.0 at% Al-7.5 at% Hf; Ni-22.5 at% Al-5.0 at% Hf.
A. Baldan, D. R. F. West
openaire   +1 more source

The coarsening of γ′ particles in NiAlMoTa and NiAlMoW alloys

Scripta Metallurgica, 1985
Role des elements refractaires Mo, Ta et W dans les super-alliages a base de nickel; etude du grossissement de γ' dans des systemes quaternaires modeles en termes de morphologie et de composition du precipite et des changements de parametre cristallin. Alliages 75 Ni−15 Al−7,5 Mo−2,5 Ta et 75 Ni−15 Al−7,5 Mo−2,5 W (composition atomique)
S. Sadiq, D.R.F. West
openaire   +1 more source

Ni-Al 2 O 3 and Ni-Al composite high-aspect-ratio microstructures

SPIE Proceedings, 1998
High-aspect-ratio microstructures (HARMs) have a variety of potential applications in heat transfer, fluid mechanics, catalysts and other microelectromechanical systems (MEMS). The aim of this work is to demonstrate the feasibility to fabricate high performance particulate metal-matrix composite and intermetallic micromechanical structures using the ...
Tao Wang, Melford Sorrell, Kevin W. Kelly, Evan Ma   +3 more
openaire   +1 more source

An unknown Ni-Al hydrosilicate

Acta Geologica Hungarica, 2003
An "unknown Ni-Al hydrosilicate" was found in the karstic nickel deposits in the localities Ba and Takovo in Serbia, and Aghios Ioannis in Greece. It occurs in fine-grained bluish-green and green aggregates with takovite and hydrated halloysite. It is an epigenetic product in the karstic nickel deposit.
openaire   +1 more source

On the four-phase reactions in the Ti–Ni–Al system

Intermetallics, 2009
Two four-phase reactions of transition type in the Ti-Ni-Al system were studied on several alloys, which were annealed at carefully set temperatures and quenched. The phase constitution was established by XRD and EPMA analyses. Due to sluggish reaction kinetics, the transition temperatures were defined by annealing and quenching techniques as no DTA ...
ULLAH KHAN A, YAN X, ROGL P, SACCONE, ADRIANA   +3 more
openaire   +3 more sources

???????????????????? ???????????????????????????? ?? ???????????????????????????? ???????????????? Ni-Al ?????? ?????????????????????????????? ????????????

2018
The method of optical and electron microscopy and X-ray analysis were used to study the interaction processes of the Ni???Al system in the temperature range of 1075 K to 1775 K at the pressures of 1??10???; 3,5 GPa.
openaire   +1 more source

?????????????????? ?? ???????????????????????? ???????????????? ?????????????????????????????????? ???????????????????????????? Ni???Al

2014
???????????????????? ?????????????????? ?????????????????? ?? ???????????????? ???????????????????????????? ?????????????????? ?????????????????????????? Ni???Al ?? ?????????????? ???????????? 7 ??????, ???????????????????? ?????????????? ???????????????? ?????????????????? ?? ?????????????? ??????????. ?????????????? ?????????????????? ????????????????
openaire   +1 more source