Synchrotron X-Ray Diffraction Observation Of Phase Transformation During Annealing Of Si Processed By High-Pressure Torsion
PHILOSOPHICAL MAGAZINE LETTERS(2021)
摘要
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 similar to 180 degrees C while another metastable phase having a hexagonal diamond (hd) structure appeared at similar to 190 degrees C. High-resolution transmission microscopy analysis revealed that hd and dc grains were present after annealing at 200 degrees C. The results indicate that a phase transformation, mainly from bc8 to hd, occurred during annealing.
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关键词
Severe plastic deformation, semiconductors, metastable phases, phase transformation, synchrotron radiation
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