Structure of nanocomposites of Al-Fe alloys prepared by mechanical alloying and rapid solidification processing

Nayak, S.S.; Murty, B.S.; Pabi, S.K.

doi:10.1007/s12034-008-0070-9

Cited by 30 publications

(17 citation statements)

References 25 publications

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“…There is a possibility of improving the ductility if the DO 22 structure can be transformed into a more symmetric cubic L1 2 structure [6]. A number of attempts have been made to stabilize the L1 2 -Al 3 Ti by the addition of ternary elements [6,7]. However, no evidence of superlattice peaks was observed for L1 2 -Al 3 Ti even after heat treatment in the mechanically alloyed samples [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…A number of attempts have been made to stabilize the L1 2 -Al 3 Ti by the addition of ternary elements [6,7]. However, no evidence of superlattice peaks was observed for L1 2 -Al 3 Ti even after heat treatment in the mechanically alloyed samples [7,8]. This has been attributed to the lower diffraction intensity of the superlattice peaks due to the lower difference in the scattering factor of Al and Ti [7e9].…”

Section: Introductionmentioning

confidence: 99%

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High strength nanocrystalline L12-Al3(Ti,Zr) intermetallic synthesized by mechanical alloying

2007

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High strength nanocrystalline L12-Al3(Ti,Zr) intermetallic synthesized by mechanical alloying

2007

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“…It was observed that the crystallite size of the Al phase was decreased and the microstrain gradually increased as Fe content was increased in the Al-Fe alloys. In the case of the addition of Fe of more than 10 wt.% to the Al matrix, the microstrain was increased and resulted in the formation of a brittle surface due to the extreme refinement of the crystallite [24]. Thus, this study did not allow Fe content to increase by more than 10 wt.% Fe.…”

Section: Resultsmentioning

confidence: 97%

“…Peak broadening (after milling and sintering) along with a peakintensity (height) decrease was observed in the Al-10 wt.% Fe alloys. This might be due to enhanced crystal-size refinement, it being amorphous, and the formation of new intermetallic compounds during MA process with addition of Fe [24]. In Al-10 wt.% Fe alloy-diffraction peaks, Al6Fe (JCPS = 47-1433) and Al13Fe4 (JCPS = 29-0042), along with the main α-Al peaks, were identified as intermetallic compounds.…”

Section: Resultsmentioning

confidence: 99%

“…However, there is limitation to the Fe content that can be dissolved in an Al matrix using the MA process. Nayak et al reported that, once the amount of Fe content increased by more than 10 wt.% Fe, the alloys suffered from the formation of nonequilibrium intermetallic Al 5 Fe 2 , which hinders the formation of a supersaturated solution [24]. Once the amount of Fe was increased more than 10 wt.%, the dissolution of Fe decreased and ultimate tensile strength decreased [23].…”

mentioning

confidence: 99%

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Microstructural and Corrosion Characteristics of Al-Fe Alloys Produced by High-Frequency Induction-Sintering Process

et al. 2019

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Al-x wt.% Fe bulk alloys were fabricated from a powder mixture of pure Al and x wt.% of Fe, where x = 2 wt.%, 5 wt.% and 10 wt.%. Initially, as-mixed mixtures were processed using a mechanical-alloying (MA) technique in an attritor for 4 h. The milling was performed in an argon atmosphere at room temperature followed by the sintering of the milled powders in a high-frequency induction furnace to produce bulk samples. Scanning electron microscopy (SEM) was used to study the morphology of the produced alloys, and X-ray diffraction (XRD) to determine the phases formed after the sintering process and their crystallite size. The corrosion behavior of the fabricated samples was studied by immerging them in a 3.5% sodium chloride (NaCl) solution at room temperature using cyclic-polarization (CP) and electrochemical-impedance-spectroscopy (EIS) techniques. The SEM results showed that Fe was uniformly distributed in the Al matrix, and XRD revealed the formation of Al and intermetallic, i.e., Al6Fe and Al13Fe4, phases in the Al-Fe alloys after sintering. The hardness of the Al-Fe alloys was increased with the addition of Fe due to the formation of intermetallic compounds. Electrochemical results showed that there was a proportional relationship between the percentage of Fe additives and corrosion potential (Ecorr) where it shifted toward a nobler direction, while corrosion current density (icorr) and corrosion rate decreased with an increasing Fe%. This observation indicates that the addition of Fe into an Al matrix leads to an improvement in the corrosion resistance of the alloys.

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The Influence of Cooling Rate and Alloying Elements on the Microstructure Refinement of Al‐5Fe Alloy

Liu¹,

Liu²,

Zhang³

et al. 2015

Light Metals 2015

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Aluminum-based alloys have been used extensively for the past five decades primarily due to their good strength vs. specific weight ratio. Numerous methods and techniques have been devised to further improve mechanical properties of these alloys as they are often used in the transport applications. Influence of the cooling rate and chemical composition on the constitution of Al-Mn-based alloy has been investigated. Elements such as B, Be, C, Ca, Cu, Fe, Mg, Si, Sr and Ti have been introduced to Al-Mn alloys in order to study their influence. Changes in cooling rates during casting using permanent copper molds with different sized troughs have also been monitored. Combined influence of changes in chemical composition and cooling rates was followed using LOM, SEM, EDS, DAS measurement and mathematic modeling. It has been established that Al-Mn-based alloys form a lot of different phases during synthesis and solidification, mostly crystalline intermetallics, but also in some cases quasicrystalline (QC) ones, especially when cooling rates exceed 500 Ks -1 . QCs are currently also considered as an alternative for reinforcement of Al-Mn-based alloys. It was found that in the case of alloy system Al-Mn-Cu-Be and cooling rates between 500 and 1350 Ks -1 the preferred phase formed was an icosahedral QC phase or iQC. Icosahedral QC phase formed as the primary phase and in some cases also in the form of the quasicrystalline eutectic (α Al + iQC). Additions of B, C, Ca, Ti and Sr have not proven to be effective in promoting formation of quasicrystals in cast Al-Mn alloys whilst Fe, Cu, Mg and Si proved to be highly efficient.

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Structure of nanocomposites of Al-Fe alloys prepared by mechanical alloying and rapid solidification processing

Cited by 30 publications

References 25 publications

High strength nanocrystalline L12-Al3(Ti,Zr) intermetallic synthesized by mechanical alloying

High strength nanocrystalline L12-Al3(Ti,Zr) intermetallic synthesized by mechanical alloying

Microstructural and Corrosion Characteristics of Al-Fe Alloys Produced by High-Frequency Induction-Sintering Process

The Influence of Cooling Rate and Alloying Elements on the Microstructure Refinement of Al‐5Fe Alloy

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