Reaction kinetics and biasing in Al/Ni multilayers

Edelstein, A. S.; Everett, R.K.; Richardson, Gisela; Qadri, S. B.; Foley, Jim; Perepezko, John H.

doi:10.1016/0921-5093(94)06501-2

Cited by 57 publications

(21 citation statements)

References 13 publications

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“…In cold rolled multilayers, this first step is not thermally activated but induced by the severe plastic deformation prior to annealing. This feature might explain why we measured an onset temperature of 468 K (DSC, 20K/min) for the Al 3 Ni phase formation, while for deposited multilayers, reported data obtained at a similar heating rate are higher (513K for a period of 11.42 nm [27] and 476K for a period of 10 nm [16]). Thus, the present results indicate that the nucleation of Al 3 Ni is kinetically favoured in Al-Ni mixed regions.…”

mentioning

confidence: 76%

“…This is explained by the asymmetry of the interdiffusion coefficients, with Ni diffusing much more rapidly into Al than Al into Ni [22,23]. However, depending on the nominal composition of the multilayer and on the processing history, also different initial intermediate phases such as AlNi [19,20,[24][25][26], AlNi 3 [10] or a metastable Al 9 Ni 2 -phase [24,27] Argon flow for 2 min at 250°C. This temperature was chosen because it is close to the onset for the Al 3 Ni formation [12,14,17,18], and the duration was sufficiently short to avoid significant grain growth.…”

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confidence: 99%

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Non-equilibrium intermixing and phase transformation in severely deformed Al/Ni multilayers

Sauvage

Dinda²,

Wilde

2007

Scripta Materialia

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Al/Ni multilayers have been prepared by repeated folding and cold rolling (F&R) of elemental foils. The thickness of Al and Ni foils is reduced down to less than 50 nm after fifty F&R cycles. Three-dimensional atom probe analyses clearly reveal the presence of supersaturated solid solutions and give the evidence of deformation-induced intermixing. The formation of the solid solutions and their transformation into the Al 3 Ni phase upon annealing is discussed.

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mentioning

confidence: 76%

mentioning

confidence: 99%

Non-equilibrium intermixing and phase transformation in severely deformed Al/Ni multilayers

Sauvage

Dinda²,

Wilde

2007

Scripta Materialia

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“…The diffusion barrier formation occurs under the metastable conditions, [1,[4][5][6]. The (f 1 + f 2) -intermetallic phases solidification preceded by the substrate dissolution, [10], both appear in a cyclical mode.…”

Section: Ni-substrate Dissolutionmentioning

confidence: 99%

“…The products of the peritectic transformations are some phases/ compounds, like: Al 3 Ni, Al 3 Ni 2 ,…,. According to the studies, [1,[4][5][6], the barrier formation (phases' solidification) occurs under meta-stable conditions. Usually, it is concluded that the diffusion barrier consists of one phase, that is: Al 9 Ni 2 , [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Prediction Of The Diffusion Barrier Morphology In The Al/Ni – Nano-Foil Designed For The Self-Propagating Reaction

Wołczyński

2015

Archives of Metallurgy and Materials

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Thermodynamic model for the diffusion barrier formation in the Al/Ni nano-foil is presented. Two types of diffusion are distinguished in the model, boundary diffusion for substrate dissolution and bulk diffusion for solidification. The creation of two phases: Al 3 Ni, Al 3 Ni 2 in the diffusion barrier are predicted due to the cyclical manner of the dissolution and solidification occurrence.Keywords: meta-stable solidification; inter-metallic phases; diffusion barrier Przedstawiony jest termodynamiczny model formowania bariery dyfuzyjnej w nano-folii Al/Ni. Wyróżniono dwa typy dyfuzji, dyfuzję graniczną dla rozpuszczania oraz dyfuzję objętościową dla krystalizacji. Przewidziano tworzenie się dwu faz: Al 3 Ni, Al 3 Ni 2 w barierze dyfuzyjnej stosownie do cyklicznego przebiegu rozpuszczania i krystalizacji.

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“…Among many laminate composites, the Ni-AlNi laminate has high potential for substituting Ni-based superalloys [2] and the Ti6Al4V-Al 3 Ti laminate attracts special attention for aerospace applications [3]. MIL composites can be fabricated via many different techniques: diffusion bonding [4], magnetron sputtering [5], electron beam evaporation [6], vacuum plasma spraying [7], and synthesis reactions between dissimilar elemental metal foils [2,3,[8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Reaction synthesis using foils has some advantages over other * Tel.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties and deformation behaviour of laminated titanium-intermetallic composites synthesised using Ti and Cu foils

Konieczny¹

2010

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Ti-intermetallic laminated composites were fabricated via reaction synthesis in vacuum using foils of titanium and copper with controlled temperature, treating time and pressure. Microstructural examinations using SEM and EDX demonstrated that copper layers were completely consumed and five intermetallic compounds: Ti2Cu, TiCu (predominant phase), Ti3Cu4, Ti2Cu3 and TiCu4 were formed. The mechanical properties and fracture behaviour of the fabricated composites were examined. The results showed that treating time at 900• C was a main factor determining properties. After 5 hours of treating all investigated composites with the same thickness of starting Ti foil have higher yield strength, higher ultimate tensile strength and higher flexural strength than composites after 0.5 hour of treating. Only strain at fracture of the composites decreases with increasing of the treating time. The composites exhibited good cohesion between layers during tensile test. Delamination of layers occurred during three-point bending test, especially when the load perpendicular to the laminates was applied.K e y w o r d s : laminated composite, intermetallics, mechanical properties, delamination

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Reaction kinetics and biasing in Al/Ni multilayers

Cited by 57 publications

References 13 publications

Non-equilibrium intermixing and phase transformation in severely deformed Al/Ni multilayers

Non-equilibrium intermixing and phase transformation in severely deformed Al/Ni multilayers

Thermodynamic Prediction Of The Diffusion Barrier Morphology In The Al/Ni – Nano-Foil Designed For The Self-Propagating Reaction

Mechanical properties and deformation behaviour of laminated titanium-intermetallic composites synthesised using Ti and Cu foils

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