The nanocrystalline structure formation in germanium subjected to severe plastic deformation

Исламгалиев, Р. К.; Chmelı́k, František; Gibadullin, I.F.; Biegel, W.; Valiev, Ruslan Z.

doi:10.1016/0965-9773(94)90109-0

Cited by 14 publications

(2 citation statements)

References 15 publications

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“…In the last decade, the bulk nano and ultrafine grained materials have received considerable scientific and application attention. Nowadays, severe plastic deformation (SPD) is most frequently used for the grain refinement [ 3 , 4 ]. The basic principle of the SPD process consists in inducing an extremely high plastic strain into the material resulting in a substantial grain refinement and improved strengths.…”

Section: Introductionmentioning

confidence: 99%

Annealing Effects in Twin-Roll Cast AA8006 Aluminium Sheets Processed by Accumulative Roll-Bonding

Cieslar

Šlapáková

2014

Materials

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Ultrafine grained sheets were prepared from a twin-roll cast AA8006 aluminium alloy using accumulative roll-bonding process at room temperature. The evolution of microstructure of sheets after three accumulative roll-bonding passes during isochronal annealing with a constant step of 20 °C/20 min was studied by light and electron microscopy. The influence of the resulting microstructure on mechanical properties was monitored by microhardness measurements. The microhardness increases when the material is annealed up to 160 °C. Above this temperature a fast drop of microhardness occurs followed by a negligible variation at annealing temperatures exceeding 300 °C. In order to map continuously the microstructure changes during annealing, the in situ TEM experiments in the heating stage were performed as a supplement to post-mortem TEM observations.

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Section: Introductionmentioning

confidence: 99%

Annealing Effects in Twin-Roll Cast AA8006 Aluminium Sheets Processed by Accumulative Roll-Bonding

Cieslar

Šlapáková

2014

Materials

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“…23) Blank and Kulnitskiy 30) carried out the HPT processing of Si, and reported the direct transitions of Si-I to metastable phases under shear deformation. Islamgaliev et al further reported the nanograin refinement and the formation of metastable phases of Ge 31,32) and Si, 33) and photoluminescence from the HPT-processed Si. 33) However, the detailed crystal structural properties and functional properties such as electrical resistivities and photoluminescence have not fully understood so far.…”

Section: Introductionmentioning

confidence: 99%

Severe Plastic Deformation of Semiconductor Materials Using High-Pressure Torsion

Ikoma

2019

Mater. Trans.

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Severe plastic deformation (SPD) has been widely studied in order to enhance the strength and ductility of metallic materials. Among various SPD processing techniques, high-pressure torsion (HPT) can be applied to various brittle materials including semiconductors. In this overview, we report on the HPT processing of Si, Ge, and compound semiconductor GaAs. When crystalline Si was subjected to HPT, metastable body-centered-cubic (bcc) Si-III and rhombohedral Si-XII as well as amorphous regions were formed. After annealing, Si-III and Si-XII reversely transformed to diamond-cubic Si-I. No appreciable photoluminescence (PL) peak was observed from the as-HPT processed samples while a broad PL peak originating from Si-I nanograins appeared after annealing. The electrical resistivity was increased just after compression without anvil rotation, but it decreased after HPT-processing because of the formation of semimetallic Si-III. In the case of Ge, metastable tetragonal Ge-III was formed by room-temperature HPT processing. A broad PL peak originating from diamond-cubic Ge-I nanograins was observed after annealing. The metastable bcc Ge-IV was observed in the cryogenic-HPT-processed samples. In the case of GaAs, no metastable phase was observed in the HPT-processed samples. A strong PL peak associated with the bandgap disappeared after HPT processing. An additional PL peak in the visible light region appeared after annealing. These results suggested that noble properties such as optical and electrical properties can be obtained by applying HPT processing to semiconductor materials.

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Yield stress measurements on an Al-1.5% Mg alloy with submicron grain size using a miniature bending procedure

Horita

Furukawa

et al. 1995

Materials Letters

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The nanocrystalline structure formation in germanium subjected to severe plastic deformation

Cited by 14 publications

References 15 publications

Annealing Effects in Twin-Roll Cast AA8006 Aluminium Sheets Processed by Accumulative Roll-Bonding

Annealing Effects in Twin-Roll Cast AA8006 Aluminium Sheets Processed by Accumulative Roll-Bonding

Severe Plastic Deformation of Semiconductor Materials Using High-Pressure Torsion

Yield stress measurements on an Al-1.5% Mg alloy with submicron grain size using a miniature bending procedure

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