Selection of Twin Variants in Dynamic Plastic Deformation of Pure Ti at Liquid Nitrogen Temperature
Received date: 2021-11-12
Revised date: 2021-12-22
Online published: 2022-02-22
Supported by
Joint Research and Development Fund of Liaoning Province and Shenyang National Laboratory for Materials Science(2019JH3/30100030);Young Talents Project of Shenyang National Laboratory for Materials Science, and Natural Science Foundation Project of Liaoning Provincial Department of Education(J2020050)
Pure Ti can form twins during deformation due to the hcp crystal structure, and some kinds of twins can easily form under certain conditions, thus affecting the properties of materials. It has considerable influence on the properties of materials through the regulation of twin types and variants. This work investigates the effect of the dislocation slip of adjacent grains on the selection of twin variants during the deformation of pure Ti. The dynamic plastic deformation (DPD) of commercially pure Ti (99.9%) was performed at liquid nitrogen temperature (-196oC). The microstructure before and after the deformation was observed using EBSD. The influence of twinning on Schmid factor (m) before and after deformation was investigated, and a mechanism for selecting twin variants of polycrystalline pure Ti was proposed. The results show that after DPD at liquid nitrogen temperature, high-density primary twins appeared in pure Ti, followed by secondary and double twins. After twinning, the Schmid factor of basal slip changed noticeably, and the m of a large number of grains was close to 0.5. Based on the geometric compatibility factor (m') of the original slip and twin matching relationship and the Schmid factor of an adjacent grain (m1), a new orientation compatibility factor ω (ω = m1·m') was established, and the selection of twin variants in the plastic deformation of polycrystalline pure titanium was quantitatively analyzed. It was discovered that the ω determines the selection of twin variants in pure Ti, and the pyramidal slip <a> of the adjacent grain plays a significant role in promoting the initiation of twin variants.
Dong GAO , Yu ZHOU , Ze YU , Baoguang SANG . Selection of Twin Variants in Dynamic Plastic Deformation of Pure Ti at Liquid Nitrogen Temperature[J]. Acta Metall Sin, 2022 , 58(9) : 1141 -1149 . DOI: 10.11900/0412.1961.2021.00491
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