TY - JOUR
T1 - Synchrotron X-ray diffraction observation of phase transformation during annealing of Si processed by high-pressure torsion
AU - Ikoma, Yoshifumi
AU - Yamasaki, Terumasa
AU - Masuda, Takahiro
AU - Tange, Yoshinori
AU - Higo, Yuji
AU - Ohishi, Yasuo
AU - McCartney, Martha R.
AU - Smith, David J.
AU - Horita, Zenji
N1 - Funding Information:
This work was supported by Grants-in-Aid for Scientific Research (S), (A), and (B) from the Japan Society for the Promotion of Science, Japan [JP26220909, JP19H00830, JP18H01384]. The HPT process was carried out in the International Research Center on Giant Straining for Advanced Materials at Kyushu University. The authors also acknowledge the use of facilities in the John M. Cowley Center for High Resolution Electron Microscopy at Arizona State University. The synchrotron radiation experiments were performed at the BL04B1 of SPring-8 with the approval of JASRI [2017A1851, 2017A1864, 2017A1972, 2017B1487, 2018A1451, 2018B1494, 2018B1697].
Publisher Copyright:
© 2021 Informa UK Limited, trading as Taylor & Francis Group.
PY - 2021
Y1 - 2021
N2 - In situ observation of a phase transformation during annealing of Si containing diamond-cubic (dc) and metastable phases has been performed using synchrotron X-ray diffraction. Metastable body-centred-cubic (bc8) and rhombohedral (r8) phases were formed by high-pressure torsion. These metastable phases gradually disappeared when increasing the annealing temperature to ∼ 180°C while another metastable phase having a hexagonal diamond (hd) structure appeared at ∼ 190°C. High-resolution transmission microscopy analysis revealed that hd and dc grains were present after annealing at 200°C. The results indicate that a phase transformation, mainly from bc8 to hd, occurred during annealing.
AB - In situ observation of a phase transformation during annealing of Si containing diamond-cubic (dc) and metastable phases has been performed using synchrotron X-ray diffraction. Metastable body-centred-cubic (bc8) and rhombohedral (r8) phases were formed by high-pressure torsion. These metastable phases gradually disappeared when increasing the annealing temperature to ∼ 180°C while another metastable phase having a hexagonal diamond (hd) structure appeared at ∼ 190°C. High-resolution transmission microscopy analysis revealed that hd and dc grains were present after annealing at 200°C. The results indicate that a phase transformation, mainly from bc8 to hd, occurred during annealing.
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U2 - 10.1080/09500839.2021.1905192
DO - 10.1080/09500839.2021.1905192
M3 - Article
AN - SCOPUS:85103548228
SN - 0950-0839
VL - 101
SP - 223
EP - 231
JO - Philosophical Magazine Letters
JF - Philosophical Magazine Letters
IS - 6
ER -