Plastic deformation of bunsenite (NiO) at temperatures below 1 050 °C

Guiberteau, Fernando; Donminguez-Rodriguez, A.; Spendel, M.; Castaing, J.

doi:10.1051/rphysap:0198600210208700

Cited by 11 publications

(3 citation statements)

References 14 publications

(29 reference statements)

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“…The discrete change of deformation behaviour between 200 °C and 225 °C ( Figure 1 e), could not be related to a specific transition temperature. Although NiO has a T N of ∼251 °C [ 25 ], the expected change of plasticity around the T N was not reported in [ 35 ]. The brittle-to-ductile transition temperature (BDTT) of NiO has been reported to be ∼0.3 of the melting temperature or approximately ∼600 °C [ 36 ], which is still significantly above 225 °C.…”

Section: Discussionmentioning

confidence: 99%

Exchange Bias Demonstrated in Bulk Nanocomposites Processed by High-Pressure Torsion

et al. 2023

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Ferromagnetic (Fe or Fe20Ni80) and antiferromagnetic (NiO) phases were deformed by high-pressure torsion, a severe plastic deformation technique, to manufacture bulk-sized nanocomposites and demonstrate an exchange bias, which has been reported predominantly for bilayer thin films. High-pressure torsion deformation at elevated temperatures proved to be the key to obtaining homogeneous bulk nanocomposites. X-ray diffraction investigations detected nanocrystallinity of the ferromagnetic and antiferromagnetic phases. Furthermore, an additional phase was identified by X-ray diffraction, which formed during deformation at elevated temperatures through the reduction of NiO by Fe. Depending on the initial powder composition of Fe50NiO50 or Fe10Ni40NiO50 the new phase was magnetite or maghemite, respectively. Magnetometry measurements demonstrated an exchange bias in high-pressure torsion-processed bulk nanocomposites. Additionally, the tailoring of magnetic parameters was demonstrated by the application of different strains or post-process annealing. A correlation between the amount of applied strain and exchange bias was found. The increase of exchange bias through applied strain was related to the microstructural refinement of the nanocomposite. The nanocrystalline maghemite was considered to have a crucial impact on the observed changes of exchange bias through applied strain.

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Section: Discussionmentioning

confidence: 99%

Exchange Bias Demonstrated in Bulk Nanocomposites Processed by High-Pressure Torsion

et al. 2023

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“…Lastly, the measured stresses (ϳ1 GPa) are well in excess of the measured yield strengths (ϳ100 MPa) for single crystals of NiO and CoO in compression. 32,33 To understand the generation of gigapascal stresses in this phase, it is necessary to follow the development of these stresses on cooling. As will be discussed below, thermal mismatch stresses will actually not develop until the sample is cooled to some fraction of the melting point (e.g., 70%).…”

Section: Discussionmentioning

confidence: 99%

Residual Stress Distributions in the Solid Solution Eutectic, Co_1−xNi_xO/ZrO₂(CaO)

Brewer

Peascoe

Hubbard

et al. 2003

Journal of the American Ceramic Society

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This study investigates thermal mismatch stresses in the lamellar microstructure of the solid solution directionally solidified eutectic (DSE) oxide Co1−xNixO/ZrO2(CaO). X‐ray and neutron diffraction measurements were performed on isolated eutectic domains to measure the residual strain and stress tensors. Maximum principal residual stresses on the order of 1 GPa were recorded, with the Co1−xNixO and the ZrO2(CaO) phases maintaining states of tensile and compressive stress, respectively. The stress tensors for these materials are compared with measurements for similar DSE oxide systems and suggest that solid solution DSEs might be used to tailor the residual stress states in DSE composites.

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“…The discrete change of deformation behaviour between 200°C and 225°C (Figure 1e), could not be related to a specific transition temperature. Although NiO has a T N of ∼251°C [45], the expected change of plasticity around the T N was not reported in [18]. The brittle-toductile transition temperature (BDTT) of NiO has been reported to be ∼0.3 of the melting temperature or approximately ∼600°C [14], which is still significantly above 225°C.…”

Section: Deformation Behaviourmentioning

confidence: 98%

Exchange Bias Demonstrated in Bulk Nanocomposites Processed by High Pressure Torsion

Zawodzki¹,

Weissitsch²,

Krenn³

et al. 2023

Preprint

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Ferromagnetic (Fe or Fe 20 Ni 80 ) and antiferromagnetic (NiO) phases were deformed by high pressure torsion, a severe plastic deformation technique, to manufacture bulk sized nanocomposites and demonstrate an exchange bias, which has been reported predominantly for bilayer thin films. High pressure torsion deformation at elevated temperatures proved to be the key to obtain homogeneous bulk nanocomposites. X-ray diffraction investigations detected nanocrystallinity of the ferromagnetic and antiferromagnetic phases. Furthermore, an additional phase was identified by X-ray diffraction, which formed during deformation at elevated temperatures through the reduction of NiO by Fe. Depending on the initial powder composition of Fe 50 NiO 50 or Fe 10 Ni 40 NiO 50 the new phase was magnetite or maghemite, respectively. Magnetometry measurements demonstrated an exchange bias in the high pressure torsion processed bulk nanocomposites. Additionally, a tailoring of magnetic parameters was demonstrated by the application of different strains or post-process annealing. A correlation between the amount of applied strain and exchange bias was found. The increase of exchange bias through applied strain was related to the microstructural refinement of the nanocomposite. The nanocrystalline maghemite was considered to have a crucial impact on the observed changes of exchange bias through applied strain.

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Plastic deformation of bunsenite (NiO) at temperatures below 1 050 °C

Abstract: [3,5]. The plastic anisotropy is compared to other ionic compounds and the hardening mechanism are discussed based on mechanical data.Revue Phys. Appl. 21 (1986) 87-92 FÉVRIER 1986, Classification Physics Abstracts

Cited by 11 publications

References 14 publications

Exchange Bias Demonstrated in Bulk Nanocomposites Processed by High-Pressure Torsion

Exchange Bias Demonstrated in Bulk Nanocomposites Processed by High-Pressure Torsion

Residual Stress Distributions in the Solid Solution Eutectic, Co_1−xNi_xO/ZrO₂(CaO)

Exchange Bias Demonstrated in Bulk Nanocomposites Processed by High Pressure Torsion

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Plastic deformation of bunsenite (NiO) at temperatures below 1 050 °C

Abstract: [3,5]. The plastic anisotropy is compared to other ionic compounds and the hardening mechanism are discussed based on mechanical data.Revue Phys. Appl. 21 (1986) 87-92 FÉVRIER 1986, Classification Physics Abstracts

Cited by 11 publications

References 14 publications

Exchange Bias Demonstrated in Bulk Nanocomposites Processed by High-Pressure Torsion

Exchange Bias Demonstrated in Bulk Nanocomposites Processed by High-Pressure Torsion

Residual Stress Distributions in the Solid Solution Eutectic, Co1−xNixO/ZrO2(CaO)

Exchange Bias Demonstrated in Bulk Nanocomposites Processed by High Pressure Torsion

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Residual Stress Distributions in the Solid Solution Eutectic, Co_1−xNi_xO/ZrO₂(CaO)