Nanostructure characterization of mechanical alloyed and consolidated iron alloys

Rawers, J. C.; Krabbe, Rick; Duttlinger, N.

doi:10.1016/s0921-5093(97)00015-4

Cited by 28 publications

(5 citation statements)

References 9 publications

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“…[47] Strain hardening has been observed in SPD-processed Cu after it was annealed at 200 ЊC for 3 minutes, [46] but its flow stress decreased significantly. Nanocrystalline Cu [28] and Al [20] processed by IGC, and nanocrystalline Fe alloys [22,48] and Cu [49] obtained by hot pressing/sintering, showed steady plastic flow with very little strain hardening.…”

Section: Discussionmentioning

confidence: 99%

Microstructures and properties of nanocomposites obtained through SPTS consolidation of powders

Alexandrov

Исламгалиев

Valiev

et al. 1998

Metall Mater Trans A

122

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The microstructures and properties of copper-and aluminum-based nanocomposites processed through severe plastic torsional straining (SPTS) consolidation of metallic micrometer powders and ceramic nanopowders were investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD), microhardness and electrical resistivity measurements, and mechanical tests. It was shown that the SPTS consolidation of powders is an effective technique for fabricating metal-ceramic nanocomposites with a high density, ultrafine grain size, and high strength. Copper samples processed under a high pressure of 6 GPa exhibited high failure strength and strain as well as unusual strain hardening. Superplastic-like behavior was found in Al-Al 2 O 3 nanocomposite samples.

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Section: Discussionmentioning

confidence: 99%

Microstructures and properties of nanocomposites obtained through SPTS consolidation of powders

Alexandrov

Исламгалиев

Valiev

et al. 1998

Metall Mater Trans A

122

View full text Add to dashboard Cite

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“…Usually, various ex-situ consolidation processes (viz., uniaxial compaction followed by sintering [7,11] using conventional and/or microwave process) and in-situ consolidation processes (viz., hot compaction, hot-isostatic pressing [30], and spark plasma sintering [31]) are used for the consolidation of MC powder. Among these consolidation techniques, spark plasma sintering (SPS) is quite promising for the synthesis of bulk NC materials [15] due to its rapid sintering. However, various parameters such as pressure, sintering temperature, holding time, and heating rate need to be optimized in order to avoid the excessive grain coarsening during the synthesis.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, nanocrystalline (NC) materials are being widely investigated for their superior mechanical, physical, and oxidation resistance properties when compared to their microcrystalline (MC) counterparts [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. NC materials, such as Fe and Fe–Cr alloys, have been synthesized by several researchers [ 6 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ] using different methods, such as electro-deposition [ 19 ], severe plastic deformation [ 13 ], and powder metallurgy [ 14 , 15 , 16 , 17 , 18 ]. Among these techniques, the powder metallurgy is widely used for the synthesis of the bulk NC materials [ 2 , 4 , 20 , 21 , 22 ] because it offers several advantages over other routes.…”

Section: Introductionmentioning

confidence: 99%

Structural Evolution during Milling, Annealing, and Rapid Consolidation of Nanocrystalline Fe–10Cr–3Al Powder

et al. 2017

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Structural changes during the deformation-induced synthesis of nanocrystalline Fe–10Cr–3Al alloy powder via high-energy ball milling followed by annealing and rapid consolidation by spark plasma sintering were investigated. Reduction in crystallite size was observed during the synthesis, which was associated with the lattice expansion and rise in dislocation density, reflecting the generation of the excess grain boundary interfacial energy and the excess free volume. Subsequent annealing led to the exponential growth of the crystallites with a concomitant drop in the dislocation density. The rapid consolidation of the as-synthesized nanocrystalline alloy powder by the spark plasma sintering, on the other hand, showed only a limited grain growth due to the reduction of processing time for the consolidation by about 95% when compared to annealing at the same temperature.

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“…Nevertheless, Cr atoms and Mn atoms are easy to embed into Fe lattice structure and generate new solid solution since their atomic radius is similar to Fe atom radius, resulting in their early disappearance. Moreover, as the milling time increases, the regions of grain boundary get dominated increasingly, resulting in finely distribution of Cr and Mn on or in the grain boundaries [ 23 ]. It is observed that the peak intensity of Al disappears after 10 h milling, and diffraction peaks of Ti further decreases.…”

Section: Resultsmentioning

confidence: 99%

In-Situ Synthesis, Microstructure, and Mechanical Properties of TiB2-Reinforced Fe-Cr-Mn-Al Steel Matrix Composites Prepared by Spark Plasma Sintering

Liu

Chen

et al. 2021

Materials

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In-situ synthesis, microstructure, and mechanical properties of four TiB2-Reinforced Fe-Cr-Mn-Al Steel Matrix Composites have been researched in this work. The microstructure and phases of the prepared specimens have been characterized by using scanning electron microscopy (SEM), X-ray diffraction technique, and transmission electron microscopy (TEM). The sintered specimens consisted of Fe2AlCr, CrFeB-type boride, and TiB2. The mechanical properties, such as hardness and compression strength at room temperature (RT) and at elevated temperatures (600 °C and 800 °C) have been evaluated. The compressive strength and Vickers hardness of the sintered specimens increase with the volume fraction of TiB2 in the matrix, which are all much higher than those of the ex-situ TiB2/Fe-15Cr-20Mn-8Al composites and the reported TiB2/Fe-Cr composites with the same volume fraction of TiB2. The highest Vickers hardness and compressive strength at room temperature are 1213 ± 35 HV and 3500 ± 20 MPa, respectively. As the testing temperature increases to 600 °C, or even 800 °C, these composites still show relatively high compressive strength. Precipitation strengthening of CrFeB and in-situ synthesis of TiB2 as well as nanocrystalline microstructure produced by the combination of mechanical alloying (MA) and spark plasma sintering (SPS) can account for the high Vickers hardness and compressive strength.

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Nanostructure characterization of mechanical alloyed and consolidated iron alloys

Cited by 28 publications

References 9 publications

Microstructures and properties of nanocomposites obtained through SPTS consolidation of powders

Microstructures and properties of nanocomposites obtained through SPTS consolidation of powders

Structural Evolution during Milling, Annealing, and Rapid Consolidation of Nanocrystalline Fe–10Cr–3Al Powder

In-Situ Synthesis, Microstructure, and Mechanical Properties of TiB2-Reinforced Fe-Cr-Mn-Al Steel Matrix Composites Prepared by Spark Plasma Sintering

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