Aluminium Based Alloys with High Content of Metastable Phases Prepared by Powder Metallurgy

Michalcová, Alena; Marek, Ivo; Knaislová, Anna; Veselka, Zbyněk; Vavřík, Jaroslav; Bastl, Tadeáš; Hrdlička, T.; Kučera, Daniel; Vojtěch, Dalibor

doi:10.12693/aphyspola.134.688

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…The rapidly solidified aluminum alloy with the addition of Fe (up to 11 wt. %) is composed of a supersaturated solid solution of Fe in aluminum and metastable Al 6 Fe [17] on the faster-cooling side, while the air side contains a smaller amount of stable Al 13 Fe 4 , also referred as Al 3 Fe [18], and metastable Al 6 Fe. The supersaturated TM elements in our study were confirmed by TEM analyses in Figure 5, where all the nano-precipitates consist of Al, Mn and Fe.…”

Section: Resultsmentioning

confidence: 99%

Bimodal Microstructure Obtained by Rapid Solidification to Improve the Mechanical and Corrosion Properties of Aluminum Alloys at Elevated Temperature

Paulin

Donik

Cvahte

et al. 2021

Metals

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The demand for aluminum alloys is increasing, as are the demands for higher strength, with the aim of using lighter products for a greener environment. To achieve high-strength, corrosion-resistant aluminum alloys, the melt is rapidly solidified using the melt-spinning technique to form ribbons, which are then plastically consolidated by extrusion at elevated temperature. Different chemical compositions, based on adding the transition-metal elements Mn and Fe, were employed to remain within the limits of the standard chemical composition of the AA5083 alloy. The samples were systematically studied using light microscopy, scanning electron, and transmission microscopy with electron diffraction spectrometry for the micro-chemical analyses. Tensile tests and Vickers microhardness were applied for mechanical analyses, and corrosion tests were performed in a comparison with the standard alloy. The tensile strength was improved by 65%, the yield strength by 45% and elongation by 14%. The mechanism by which we achieved the better mechanical and corrosion properties is explained.

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Section: Resultsmentioning

confidence: 99%

Bimodal Microstructure Obtained by Rapid Solidification to Improve the Mechanical and Corrosion Properties of Aluminum Alloys at Elevated Temperature

Paulin

Donik

Cvahte

et al. 2021

Metals

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“…Thus, for the case of powder compaction a considerable interface portion provides perfect initial conditions for enhanced diffusivity and, thus, ability to create bulk samples from unjoinable metals, however leaving an open question concerning the purity of the final product. [ 24 ] Diffusion enhancement in case of solid state welding of thin disc samples is much more limited due to the smaller amount of interacting interfaces, but it allows us to obtain a contamination‐free bulk composite.…”

Section: Introductionmentioning

confidence: 99%

Structure and Mechanical Behavior of Al–Nb Hybrids Obtained by High‐Pressure‐Torsion‐Induced Diffusion Bonding and Subsequent Annealing

Korznikova

Nazarov

et al. 2020

Adv Eng Mater

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The main approach of mechanical consolidation of dissimilar metals consists in solid state joining of thin discs or powders by means of pressure‐assisted shear deformation. Prior to this research, most strongly dissimilar systems, such as Al–W and Al–Ti, were only bonded by means of mechanical alloying and subsequent powder compaction. Herein, pioneering experimental research on the one‐step synthesis of an Al–Nb composite by means of diffusion bonding through high‐pressure torsion that allows figuring out several unusual results is presented. The maximal microhardness value is revealed to locate in the middle radius area, decreasing at the sample edge. Formation of a small amount of Al3Nb intermetallic phase is detected at room temperature deformation, while its equilibrium formation normally occurs above 600 °C. Post‐deformational annealing at 400 °C results in the overall decrease of the microhardness value along with its growth on the sample edge. Annealing at 600 °C does not lead to any degradation of the mechanical characteristics by comparison to those after annealing at 400 °C. The obtained results are discussed and explained in frames of contribution of different factors to the strengthening and softening dynamics of the composite material.

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Influence of Cooling Speed during Melt Spinning Process on Properties of Al-Fe-Mm-Si-Mg Bulk Materials Prepared by SPS

Michalcová¹,

Zábrodský²,

Knaislová³

et al. 2019

Manufacturing Technology

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This work is devoted to description of microstructure of bulk Al-Fe-Mm-Si-Mg alloys and their thermal stability. The alloy was prepared at different cooling rates (600, 1000 and 1400 RPM) during melt spinning process and sintered at the same conditions by SPS. The aim of this work was to prove if change in melt spinning conditions influence the behaviour of bulk material. It was proven that independently on cooling rate precipitation occurs during sintering process. All materials exhibited heterogenous microstructure composed of fine and coarse areas residue of melt spinning process. During annealing of bulk materials prepared by powder metallurgy, no precipitation of new phase was observed. It is an evidence that precipitation mechanism of self-healing is not possible for these alloys.

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Aluminium Based Alloys with High Content of Metastable Phases Prepared by Powder Metallurgy

Cited by 3 publications

References 3 publications

Bimodal Microstructure Obtained by Rapid Solidification to Improve the Mechanical and Corrosion Properties of Aluminum Alloys at Elevated Temperature

Bimodal Microstructure Obtained by Rapid Solidification to Improve the Mechanical and Corrosion Properties of Aluminum Alloys at Elevated Temperature

Structure and Mechanical Behavior of Al–Nb Hybrids Obtained by High‐Pressure‐Torsion‐Induced Diffusion Bonding and Subsequent Annealing

Influence of Cooling Speed during Melt Spinning Process on Properties of Al-Fe-Mm-Si-Mg Bulk Materials Prepared by SPS

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