Abstract
We report shear bands as a precursor structure of deformation twinning in Pb3(PO4)2. Atomic force microscopy shows “slip-line” like traces on the surface of untwinned regions of the sample. The traces are shear bands oriented along twin boundaries of the ferroelastic R3¯m-C2/c transition. Computer simulations reproduce the shear band patterns and show that each shear band is a precursor embryo of a twin wall that forms under higher shear stress. This observation reveals the structural origin of twin boundaries under stress conditions just before ferroelastic switching occurs.
Highlights
We report shear bands as a precursor structure of deformation twinning in Pb3(PO4)2
shear bands oriented along twin boundaries of the ferroelastic R3m-C2
a precursor embryo of a twin wall that forms under higher shear stress
Summary
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