Softening Behaviors of Severely Deformed Zn Alloy Studied by the Nanoindentation

Authors :: Jiangjiang Hu
Taihua Zhang
Wei Zhang
Guangjian Peng
Yusheng Zhang
Xu Sun
Shuang Han
Shuo Sun
Source :: Coatings, Vol 10, Iss 803, p 803 (2020), Coatings, Volume 10, Issue 9
Publication Year :: 2020
Publisher :: MDPI AG, 2020.
Abstract: Zamak 3 alloy treatment by sliding-friction treatment (SFT) was investigated by nanoindentation to explore the influence of microstructure and strain rate on nanoscale deformation at room temperature. The results show that obvious material softening occurs in the ultrafine-grained (UFG) Zn alloy and strain-hardening happens in the twinning-deformed layer, respectively. It can be concluded that almost constant values of V in the UFG Zn alloy contribute to the dislocations moving along the grain boundary (GB) not cross the grain interior. In the twinning-deformed layer, the highly frequent dislocation&ndash<br />twinning boundary (TB) interactions are responsible for subsequent inverse Cottrell&ndash<br />Stokes at lower stress, which is quite different from dislocation&ndash<br />dislocation reaction inside the grain in their coarse-grained (CG) counterpart.

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