Crystallization behavior and mechanical properties of (Al90Fe5Ce5)100−xTix amorphous alloys

Singh, D. K.; Singh, Devinder; Mandal, R.K.; Srivastava, O. N.; Tiwari, R. S.

doi:10.1016/j.jallcom.2016.06.272

Cited by 18 publications

(11 citation statements)

References 40 publications

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“…Thus, the crystallization product for Al-Ce-Cu-W amorphous was identified as bcc-structure Al-Ce-Cu-W phase without any binary/ternary Ce-containing phases such as Ce-Al and Ce-Al-TM. However, such a crystallization behavior was rarely observed in the reported Al-Ce-TM amorphous system [21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40]. The reported crystallization products for Al-Ce-TM amorphous system are summarized in Table 2, and the corresponding crystallization conditions are also listed.…”

Section: Resultsmentioning

confidence: 99%

Interfacial Microstructure in W/2024Al Composite and Inhibition of W-Al Direct Reaction by CeO2 Doping: Formation and Crystallization of Al-Ce-Cu-W Amorphous Layers

Lv¹,

Mao²,

Wang³

et al. 2019

Materials

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In this work, interfacial microstructure in W/2024Al composite and inhibition of the W-Al direct reaction by CeO2 doping were investigated. The composites were prepared through powder sintering, and after preparation the composites were treated by annealing at 823 K. For the prepared W/2024Al composite, a multi-phase thin layer composed of WAl12 and WAl5 compounds were formed at the interface due to the W-Al direct reaction. While doping CeO2 in the composite, Al-Ce-Cu-W amorphous substituting of W-Al compounds were formed at the interfacial reaction layer. In an annealed state, the composite with CeO2 doping shows a significant inhibitory effect on W-Al compounds, which was attributed to the crystallized layer that evolved from Al-Ce-Cu-W amorphous as an interfacial obstacle. The crystallization product for Al-Ce-Cu-W amorphous layer was identified as bcc-structure Al-Ce-Cu-W phase without any binary/ternary Ce-containing phases. Therefore, by doping CeO2 in W/2024Al composite, W-Al direct reaction was markedly inhibited during both preparation and annealing.

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Section: Resultsmentioning

confidence: 99%

Interfacial Microstructure in W/2024Al Composite and Inhibition of W-Al Direct Reaction by CeO2 Doping: Formation and Crystallization of Al-Ce-Cu-W Amorphous Layers

Lv¹,

Mao²,

Wang³

et al. 2019

Materials

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“…Hence, load to fracture decreases, and this reveals the decrease in the fracture toughness for the hydrogenated samples. The significant increase in the hardness for the qcglass composites as compared to as-synthesized ribbons has been observed, and this is due to the precipitation of nano-quasicrystal grains in the amorphous matrix [45][46][47][48][49][50][51][52][53]. Minor changes in the microhardness behavior after hydrogenation have been observed for the qc-glass composites.…”

Section: Influence Of Hydrogenation On the Structural And Microhardnementioning

confidence: 86%

Hydrogenation of Zr-Based Quasicrystals

Singh¹,

Tiwari²,

Srivastava³

2017

New Advances in Hydrogenation Processes - Fundamentals and Applications

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In this chapter, results of our recent investigations on the hydrogenation behavior of Zrbased quasicrystalline alloys and its effect on their structural and microhardness behavior have been discussed. The microstructural changes with respect to the addition of Ti and their correlation with hydrogen storage characteristics of (Zr 69.5 Al 7.5 Cu 12 Ni 11) 100−x Ti x (x = 0, 4 and 12) quasicrystalline alloys have been studied. The substitution of Ti affects the nucleation and growth characteristics of nano-quasicrystals. The grain size of quasicrystals decreases with addition of Ti. The hydrogen uptake capacity of partially quasicrystalline alloys has been improved by the addition of Ti. The alloys with x = 0, 4, and 12 absorbed 1.20 wt.%, 1.38 wt.%, and 1.56 wt.% of hydrogen, respectively. A significant effect on the structure/microstructure and mechanical behavior of (Zr 69.5 Al 7.5 Cu 12 Ni 11) 100−x Ti x quasicrystalline alloys due to hydrogenation has been observed. The change in the microhardness behavior has been discussed based on microstructural variation resulting to Ti addition. The study is focused on investigations of these materials to understand the structure (microstructure)-property correlations.

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“…It exhibits sharp diffraction peaks with icosahedral symmetry [14]. Quasicrystals exhibit unique physical properties which strongly differ from the properties of metals, insulators, and crystalline or amorphous phases [7][8][9][10][11][12][13][15][16][17][18][19][20][21]. Thus, these materials have the potential to be used in many areas of advanced technology.…”

Section: Introductionmentioning

confidence: 99%

Structure Analysis of Quasicrystal Approximants by Rotation Electron Diffraction (RED)

Singh¹,

Hovmöller²

2020

Electron Crystallography

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Complete 3D electron diffraction can be collected by rotation electron diffraction (RED) for single-crystal powder-sized samples, i.e., <0.1 μm, in all dimensions. Data collection takes about 1 h and data processing takes another hour. The crystal structures are solved by standard crystallographic techniques. X-ray crystallography requires crystals several micrometers big. For nanometer-sized crystals, electron diffraction and electron microscopy (EM) are the only possibilities. Two methods have been developed for collecting complete (except for a missing cone) three-dimensional (3D) electron diffraction data: the rotation electron diffraction and automated electron diffraction tomography (ADT). By collecting 1000-2000 electron diffraction patterns, a complete 3D data set is obtained. The geometry in RED is analogous to the rotation method in X-ray crystallography; the sample is rotated continuously along one rotation axis. In recent years, large number of crystal structures has been solved by RED. These include the most complex zeolites ever solved and quasicrystal approximants, such as the pseudo-decagonal approximants PD2 and PD1 in Al-Co-Ni. In this chapter, the results of our recent studies on the structure analysis of complex pseudo-decagonal (PD) quasicrystal approximants PD2 (a = 23.2, b = 32.3, c = 4.1 Å) and PD1 (a = 37.3, b = 38.8, c = 4.1 Å) by RED have been discussed. These are known to be the most complicated approximant structures ever solved to atomic resolution by electron crystallography. PD2 and PD1 are built of characteristic 2 nm wheel clusters with fivefold rotational symmetry, which agrees with other approximants in the PD series as well as with the results from high-resolution electron microscopy images.

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Crystallization behavior and mechanical properties of (Al90Fe5Ce5)100−xTix amorphous alloys

Cited by 18 publications

References 40 publications

Interfacial Microstructure in W/2024Al Composite and Inhibition of W-Al Direct Reaction by CeO2 Doping: Formation and Crystallization of Al-Ce-Cu-W Amorphous Layers

Interfacial Microstructure in W/2024Al Composite and Inhibition of W-Al Direct Reaction by CeO2 Doping: Formation and Crystallization of Al-Ce-Cu-W Amorphous Layers

Hydrogenation of Zr-Based Quasicrystals

Structure Analysis of Quasicrystal Approximants by Rotation Electron Diffraction (RED)

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