In:
physica status solidi (b), Wiley, Vol. 259, No. 6 ( 2022-06)
Abstract:
Multiphase Al 2 O 3 samples are simulated using molecular dynamics method. These samples consist of γ‐Al 2 O 3 and α‐Al 2 O 3 crystals embedded in a disordered phase matrix. The stress–strain curves of these samples show elastic and plastic deformation. Structural analysis indicates that the AlO bond lengths are stretched and the geometries of the AlO x ( x = 4, 5, and 6) units are distorted during tensile deformation. AlO bond breakage causes the transformation of AlO x units; AlO 4 increases while AlO 6 decreases with increasing strain. The γ‐Al 2 O 3 and α‐Al 2 O 3 crystals transfer into the disordered phase, while a small number of atoms recrystallize under tensile loads. In plastic deformation, large simplexes with radii above 1.958 Å increase rapidly with increasing strains above 0.116, with the large simplexes coalescing to form the clusters in the disordered phase. The number of large simplexes in the largest cluster increases with increasing strain values above 0.127. The growth and coalescence of large simplexes in the disordered phase cause microscopic crack formation at high strains.
Type of Medium:
Online Resource
ISSN:
0370-1972
,
1521-3951
DOI:
10.1002/pssb.202100657
Language:
English
Publisher:
Wiley
Publication Date:
2022
detail.hit.zdb_id:
208851-4
detail.hit.zdb_id:
1481096-7
