Nanocrystalline Al 5 Fe 2 intermetallic and Al 5 Fe 2 –Al composites manufactured by high-pressure consolidation of milled powders

Krasnowski, M.; Gierlotka, S.; Kulik, T.

doi:10.1016/j.jallcom.2015.09.224

Cited by 8 publications

(12 citation statements)

References 35 publications

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“…Successful consolidation of MA powders is a nontrivial problem since fully dense materials should be produced while simultaneously retaining the nanometer-sized grains without coarsening or the amorphous phases without crystallizing. Conventional consolidation of powders to full density through processes such as hot extrusion [65] and hot isostatic pressing (HIP) [66] requires use of high pressures and exposure to elevated temperatures for extended periods of time [67]. Unfortunately, however, this results in significant coarsening of the nanometer-sized grains or crystallization of amorphous phases, and consequently the benefits of nanostructure processing or amorphization are lost [68].…”

Section: Powder Consolidationmentioning

confidence: 99%

Mechanical Alloying: A Novel Technique to Synthesize Advanced Materials

Suryanarayana

2019

Research

213

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Mechanical alloying is a solid-state powder processing technique that involves repeated cold welding, fracturing, and rewelding of powder particles in a high-energy ball mill. Originally developed about 50 years ago to produce oxide-dispersion-strengthened Ni- and Fe-based superalloys for aerospace and high temperature applications, it is now recognized as an important technique to synthesize metastable and advanced materials with a high potential for widespread applications. The metastable materials produced include supersaturated solid solutions, intermediate phases, quasicrystalline phases, amorphous alloys, and high-entropy alloys. Additionally, nanocrystalline phases have been produced in virtually every alloy system. Because of the fineness of the powders, their consolidation to full density without any porosity being present is a challenging problem. Several novel methods have been developed to overcome this issue. Powder contamination during milling and subsequent consolidation constitutes another issue; this can be resolved, though expensive. A number of applications have been developed for these novel materials. This review article presents an overview of the process of mechanical alloying, mechanism of grain refinement to nanometer levels, and preparation of materials such as nanocomposites and metallic glasses. The application of mechanical alloying to synthesize some advanced materials such as pure metals and alloys, hydrogen storage materials, and energy materials is described. The article concludes with an outlook on future prospects of this technique.

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Section: Powder Consolidationmentioning

confidence: 99%

Mechanical Alloying: A Novel Technique to Synthesize Advanced Materials

Suryanarayana

2019

Research

213

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“…Köster et al [16] as well as Kobayashi et al [17] found that, in particular, Al x Fe y -rich Al intermetallic phases (type Al 13 Fe 4 and Al 5 Fe 2 ), which are formed in the AlSi coating, have a low fracture toughness (1 MPa•m 1/2 ), which is attributed to their high hardness of 900-1150 HV0.05. According to Krasnowski et al [18], the hardness of the Al 5 Fe 2 phase is 851 HV1. The AlFe and AlFe 3 phases have a lower hardness of 300 to 650 HV0.05 (Kubošová et al [19]) and a higher fracture toughness of up to 26 MPa•m 1/2 .…”

Section: No /mentioning

confidence: 99%

THE CHARACTERISTICS OF Al-Si COATING ON STEEL 22MnB5 DEPENDING ON THE HEAT TREATMENT

Kolaříková

Chotěborský²,

Hromasová

et al. 2019

Acta Polytech

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The coating on the 22MnB5 steel is intended to protect it against oxidation during the forming process. This steel is hot-pressed. A preheating before the pressing and subsequent hardening in the tool affects the properties of the AlSi coating. This study summarizes the results of investigating the effect of heat treatment parameters on the formation of intermetallics in the AlSi coating. The chemical analysis of the coating was performed by the EDX and EBSD method and the mechanical properties were determined by the Hysitron TI 950 TriboIndenter™ system. The result of this study is that, due to a diffusion during the heat treatment, the brittle coating was transformed into a tougher phase.

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“…A grain size distribution containing a fraction of grains large enough to maintain dislocation activity enables strain hardening, and thus favours an increase in ductility [6]. This prompted us to modify the microstructure of the consolidated powders to improve the ductility of the bulk materials [10,11]. We, therefore, produced the composite materials comprising a nanocrystalline intermetallic as a matrix and aluminium as a binder [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…This prompted us to modify the microstructure of the consolidated powders to improve the ductility of the bulk materials [10,11]. We, therefore, produced the composite materials comprising a nanocrystalline intermetallic as a matrix and aluminium as a binder [10,11]. Ductile aluminium was to be distributed in the form of a "network" between hard nanocrystalline particles.…”

Section: Introductionmentioning

confidence: 99%

Al13Fe4-Al Composites with Nanocrystalline Matrix Manufactured by Hot-Pressing of Milled Powders

2022

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The paper describes composites with the matrix containing a nanocrystalline intermetallic Al13Fe4 phase and microcrystalline aluminium. Mechanically alloyed Al80Fe20 powder, containing a metastable nanocrystalline Al5Fe2 phase, was mixed with 20, 30, and 40 vol.% of Al powder and consolidated at 750 °C under the pressure of 7.7 GPa. During the consolidation, the metastable Al5Fe2 phase transformed into a nanocrystalline Al13Fe4 phase. In the bulk samples, Al13Fe4 areas were wrapped around by networking Al regions. The hardness of the Al13Fe4-Al composites was in the range of 4.52–5.50 GPa. The compressive strength of the Al13Fe4-30%Al and Al13Fe4-40%Al composites was 805 and 812 MPa, respectively, and it was considerably higher than that of the Al13Fe4-20%Al composite (538 MPa), which failed in the elastic region. The Al13Fe4-30%Al and Al13Fe4-40%Al composites, in contrast, showed some plasticity: namely, 1.5% and 9.1%, respectively. The density of the produced composites is in the range of 3.27–3.48 g/cm3 and decreases with the increase in the Al content.

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Nanocrystalline Al 5 Fe 2 intermetallic and Al 5 Fe 2 –Al composites manufactured by high-pressure consolidation of milled powders

Cited by 8 publications

References 35 publications

Mechanical Alloying: A Novel Technique to Synthesize Advanced Materials

Mechanical Alloying: A Novel Technique to Synthesize Advanced Materials

THE CHARACTERISTICS OF Al-Si COATING ON STEEL 22MnB5 DEPENDING ON THE HEAT TREATMENT

Al13Fe4-Al Composites with Nanocrystalline Matrix Manufactured by Hot-Pressing of Milled Powders

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