Effect of twin boundary spacing on the deformation behaviour of Au nanowire

ZY Hou and QX Xiao and Z Wang and JG Wang and RS Liu and C Wang, PHYSICA B-CONDENSED MATTER, 581, 411952 (2020).

DOI: 10.1016/j.physb.2019.411952

The deformation behaviour of Au twinned nanowire is investigated by molecular dynamic simulation. It is found that the relationship of yield strength with twin boundary spacing (TBS) can be divided into three ranges. The deformation mechanism of Au twinned nanowire is revealed according to the dislocation-twin interactions. For those with large and medium softening TBS ranges, some Shockley partial dislocations and stair-rod dislocations are formed, and a small step is left on the TBs during the dislocation-twin interactions. But the amount of dislocations in the nanowire with medium TBS is remarkably larger than that with large TBS, and more different 111 slip planes are activated. For that with small strengthening TBS range, lots of Shockley partial dislocations are formed, and they form highly-localized shear zone at the middle of nanowire. TBs undergo a destruction and following recovery process during the dislocation-twin interactions, and the TBS is enlarged during this process.

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