Phase and Structural Transformations in the Alloys Based on Monoaluminide of Nickel

Kositsyn, S. V.; Kositsyna, I. I.

doi:10.15407/ufm.09.02.195

Cited by 30 publications

(6 citation statements)

References 37 publications

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“…(Fig. 3) [9,10]. The electrical resistance of all the alloys varied almost similarly at positive temperatures.…”

Section: Resultsmentioning

confidence: 85%

“…The analysis of these loops by the tangent method allowed determining the characteristic martensite points: M s and M f are the start and finish temperatures of the forward B2 → L1 0 martensite transformation; A s and A f are the start and finish temperatures of the reverse shear L1 0 → B2 transformation (Table 1). For comparison the same table gives the martensite transformation temperature (M s ) and the Curie temperature (T c ) for the coarse-grain state [9][10][11][12].…”

Section: Resultsmentioning

confidence: 99%

“…The Co-Ni-Al system has long and widely been used as the basis of superalloys or heatresistant sputtered coatings [9]. Co-Ni-Al alloys are appealing as MCSME materials since their plasticity is sufficiently high in the polycrystalline (PC) and microcrystalline (MC) states as the interval of the compounds we are interested in is close to the boundary between the ( β ) onephase and ( γ β + ) two-phase regions (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Study of Co-Ni-Al Alloys with Magnetically Controlled Shape Memory Effect

Kositsyna

Завалишин

2009

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Abstract. The methods of electron microscopy, resistometry and magnetometry are used to study ten (36-38)Co − (32-36)Ni − (27-30)Al (at. %) alloys. Cast coarse-crystalline and microcrystalline alloys made by melt spinning in a helium atmosphere are considered. It is shown that the martensite start temperature M s becomes 30-50°C lower as grains are refined to 1 µ m. Replacement of 1 at. % cobalt by nickel and 1 at. % aluminum by nickel makes the temperature interval of the В2 ↔ L1 0 martensite transformation (30-60)°C and (100-110)°C higher respectively. The martensite transformation hysteresis is about 100 degrees. The melt-spun Co 38 Ni 34 Al 28 alloy with the transformation temperatures М s = 31°С, М f = -34°С, А s = -6°С, А f = 70°С and Т с = 98°С is a material possessing the magnetically controlled shape memory effect.

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“…(Fig. 3) [9,10]. The electrical resistance of all the alloys varied almost similarly at positive temperatures.…”

Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of Co-Ni-Al Alloys with Magnetically Controlled Shape Memory Effect

Kositsyna

Завалишин

2009

MSF

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“…With an increase in the sintering temperature to 1000 °C, the σ-phase decomposes and the components further dissolve in each other, leading to a uniform distribution in the structure, except for Cr. We can suppose that a CoNi 0.3 Fe 0.3 Cr 0.15 Al high-entropy intermetallic compound was formed (the composition was determined based on the EDS analysis) [ 55 ]; moreover, dissolving chromium can occupy a place both in the aluminum sublattice and in the Co sublattice [ 56 ]. It is interesting to note that, according to EDS data, the amount of Cr transferred into the multicomponent phase was about 50%.…”

Section: Resultsmentioning

confidence: 99%

Combustion Synthesis and Reactive Spark Plasma Sintering of Non-Equiatomic CoAl-Based High Entropy Intermetallics

et al. 2023

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The present work reports the direct production of a high-entropy (HE) intermetallic CoNi0.3Fe0.3Cr0.15Al material with a B2 structure from mechanically activated elemental powder mixtures. Fast and efficient combustion synthesis (CS), spark plasma sintering (SPS), and reactive SPS (RSPS) methods were used to synthesize the HE powders and bulks. The formation of the main B2 phase along with some amounts of secondary BCC and FCC phases are reported, and L12 intermetallic (CS scheme) and BCC based on Cr (CS + SPS and RSPS schemes at 1000 °C) were observed in all samples. The interaction between the components during heating to 1600 °C of the mechanically activated mixtures and CS powders has been studied. It has been shown that the formation of the CoNi0.3Fe0.3Cr0.15Al phase occurs at 1370 °C through the formation of intermediate intermetallic phases (Al9Me2, AlCo, AlNi3) and their solid solutions, which coincidences well with thermodynamic calculations and solubility diagrams. Compression tests at room and elevated temperatures showed that the alloy obtained by the RSPS method has enhanced mechanical properties (σp = 2.79 GPa, σ0.2 = 1.82 GPa, ε = 11.5% at 400 °C) that surpass many known alloys in this system. High mechanical properties at elevated temperatures are provided by the B2 ordered phase due to the presence of impurity atoms and defects in the lattice.

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“…Известно, что добавки АЭ имеют ограниченную растворимость в NiAl: иттрий и диспрозий практически не растворяются [16], а раствори-мость гафния не превышает 1,3 % (при 1100 о С) и 2,9 % (при 1200 о С) [16][17][18]. Вводимые в жаростойкий связующий слой NiAl добавки АЭ выделяются как внутри зерен, так и по границам в виде двойных или тройных интерметаллидных фаз.…”

Section: электронно-лучевые процессыunclassified