Long-range ordering kinetics and ordering energy in Ni3Al-based γ′ alloys

Kozubski, R.; Sołtys, J.; Cadeville, M.C.; Pierron‐Bohnes, V.; Kim, T.H.; Schwander, Peter; Hahn, J.P.; Kostorz, G.; Morgiel, J.

doi:10.1016/0966-9795(93)90009-k

Cited by 25 publications

(21 citation statements)

References 22 publications

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“…3). These results correlate well with the data of review [6]. Alloying determines at least an increase in the concentration of the alloying element and the transition from the properties of the interme tallic compound to the properties of the ordering alloy.…”

Section: Investigation Of the Ni 3 Al-fe Alloys 477supporting

confidence: 81%

“…The temperature of complete disorder ing (t k ) is not attained in the solid state for the stoichi ometric alloy (Ni 75 Al 25 ). However, alloying with tran sition elements such as iron, chromium, and manganese promotes the transition from intermetallic properties to the properties of the ordering alloy as their concentration increases: quantity t k can be detected in the solid state [6].As a rule, electron scattering at lattice inhomoge neities in the solid solution decreases upon its order ing. Resistivity (ρ) is lower in the ordered region, while a decrease in the degree of long range order S is accompanied by an increase in ρ.…”

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Investigation of the Ni3Al-Fe alloys by resistivity measurements and differential thermal analysis

Лепихин

Stepanova

2013

Russ. J. Non-ferrous Metals

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The Ni 3 Al based intermetallic compound (γ' phase) is the main strengthening phase of foundry heat resistant nickel alloys, which represent an important group of high strength materials used when fabricating the most important details of gas turbine motors [1,2]. Currently the VKNA type alloys based on the Ni 3 Al compound (90% intermetallic phase) are developed and used in industry [3].The Ni 3 Al is ordered according to type L1 2 and occurs in a narrow concentration range near 25 at % Al. Its feature is the ability to dissolve almost all transition elements in various combinations. Substitutional alloying of this alloy extends the occurrence region of the γ' phase [2] and leads to a substantial variation in the character and temperature ranges of phase and structural transformations in the Ni 3 Al-X system [4].Practical application as a heat resistant construc tion material requires the elimination of the intercrys tallite brittleness, which is inherent to the Ni 3 Al alloy in the polycrystalline state. Iron is considered a possi ble plastificator [5].Ni 3 Al-Fe alloys are of interest for investigation not only from the manufacturing viewpoint, but also from the physical one. The solubility of iron in γ' phase sub stantially depends on the ratio of atomic concentra tions of nickel and aluminum. The chemical activity of iron and nickel atoms is close, and iron is able to form the Ni 3 Fe intermetallic phase. All these factors lead to the iron atoms being able to substitute the sites of both nickel and aluminum atoms [2]. From this viewpoint, the Ni 3 Al-Fe system can serve as the model system for the Ni 3 Al based alloyed alloys.The Ni 3 Al intermetallic compound has a high degree of long range order close to unity and retaining upon heating to 1330°C. Above this temperature, dis ordering starts. The temperature of complete disorder ing (t k ) is not attained in the solid state for the stoichi ometric alloy (Ni 75 Al 25 ). However, alloying with tran sition elements such as iron, chromium, and manganese promotes the transition from intermetallic properties to the properties of the ordering alloy as their concentration increases: quantity t k can be detected in the solid state [6].As a rule, electron scattering at lattice inhomoge neities in the solid solution decreases upon its order ing. Resistivity (ρ) is lower in the ordered region, while a decrease in the degree of long range order S is accompanied by an increase in ρ. For example, such dependence ρ(t) is observed for the Cu 3 Al ordered compound (L1 2 ) [7]. On the contrary, an abrupt drop in resistivity is characteristic of the Ni 3 Al alloy upon decreasing S (coefficient dρ/dt) is negative. This phe nomenon is observed not only for the Ni 3 Al ordered compound but also for some other intermetallic alloys and is associated with the features of their electronic spectrum [8].The temperature of disordering onset (t a ) for the Ni 3 Al alloy is that after which resistivity starts to decrease. If the alloy structure consists of the interme tallic compound (γ'...

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Section: Investigation Of the Ni 3 Al-fe Alloys 477supporting

confidence: 81%

mentioning

confidence: 99%

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confidence: 99%

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Investigation of the Ni3Al-Fe alloys by resistivity measurements and differential thermal analysis

Лепихин

Stepanova

2013

Russ. J. Non-ferrous Metals

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“…(Al,Fe)Ni 3 alloys, as seen in Fig. 8, is associated with a decrease of the activation energy for ordering kinetics [114]. It has been found that this effect is related to a decrease in the vacancy formation energy with increasing Fe contents [115].…”

Section: Diffusion-related Propertiesmentioning

confidence: 95%

Assessment of the Fe–Ni–Al system

Frisk²,

2006

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“…In addition, as follows from both experiments and modelling, as long as the content of 75 at.% of Ni is maintained in the system, the Fe atoms admixed in the g 0 -phase reside mostly on the Al-sublattice (see Ref. [3,4] for comments and references).…”

Section: Introductionmentioning

confidence: 99%