Deformation Behavior of Pure Titanium With a Rare HCP/FCC Boundary: An Atomistic Study

JQ Ren and XT Liu and QF Lei and Q Wang and XB Zhang and XD Zhang and XF Lu and HT Xue and YT Ding, MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, 23, e20190638 (2020).

DOI: 10.1590/1980-5373-MR-2019-0638

The compressive and tensile behaviors in a Ti nanopillar with a biphasic hexagonal close-packed (HCP) /face-centered cubic (FCC) phase boundary are theoretically researched using classic molecular dynamic simulation. The results indicate that the HCP/FCC interface and free surface of the nanopillar are the sources of dislocation nucleation. The plastic deformation is mainly concentrated in the metastable FCC phase of the biphasic nanopillar. Under compressive loading, a reverse phase transformation of FCC to the HCP phase is induced by the dislocation glide of multiple Shockley partial dislocations 1/6<<(1)over bar>21> under compressive loading. However, for tensile loading a large number 6 of Lomer-Cottrell sessile dislocations and stacking fault nets are formed when the partial dislocations react, which leads to an increase in stress. The formation mechanism of a Lomer-Cottrell sessile dislocation is also studied in detail. Shockley partial dislocations arc the dominant mode of plastic deformation behaviors in the metastable FCC phase of the biphasic nanopillar.

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