{332}<113> Twinning transfer behavior and its effect on the twin shape in a beta-type Ti-23.1Nb-2.0Zr-1.0O alloy. (20th November 2021)

• Record Type: Journal Article
• Authors: Yang, Yi; Zhang, Bohua; Meng, Zhichao; Qu, Lei; Wang, Hao; Cao, Sheng; Hu, Jianan; Chen, Hao; Wu, Songquan; Ping, Dehai; Li, Geping; Zhang, Lai-Chang; Yang, Rui; Huang, Aijun
• Is Part Of: Journal of materials science & technology. Volume 91(2022)
• Page Start: 58
• Page End: 66
• Publication Date: 2021-11-20
• Subjects: Titanium alloys -- Plastic deformation -- Grain boundaries -- Twinning -- Twin shape; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2021.03.015
• Languages: English
• ISSNs: 1005-0302

Abstract

Highlights: Twinning transfer (TT) behavior depends on crystallographic alignment factor (m&#39;) of two twinning systems and misorientation angle (MA) of grain pairs. The twin shape is dependent on the occurrence of TT. Twins always present a ruler shape when TT can occur and present a lenticular shape when TT is not able to occur. A possible mechanism for the relationship between the twin shape and TT behavior is proposed based on the assumption of limited average concentrated stress in front of twin tips in different grain pairs. 1) For the grain pair with a low MA and a high m&#39;, such concentrated stress could be released effectively by inducing the outgoing twining in the neighboring grain, forming a ruler-shaped paired twins. 2) For the grain pair with a high MA and a small m&#39;, such concentrated stress could be reduced effectively by enlarging the distance between micro-twin tip and grain boundary along the [113] direction, forming a lenticular-shaped twin. Abstract: The interaction between twins and grain boundaries (GB) has an important influence on the deformation and fracture behavior of materials. In the present work, {332}&lt;113&gt; twinning transfer (TT) behavior and its effect on the twin shape in a deformed β-type Ti-23.1Nb-2.0Zr-1.0O Ti alloy were investigated experimentally and with molecular dynamics simulation. The crystallographic alignment factor of the two twinning systems in the neighboring grains and the misorientation angle of the grain pairs were found to influence the occurrence of TT. This further determines the twin shape: twins present a ruler shape when TT occurs but are in a lenticular shape otherwise. Such different twin shapes are attributed to the local stress states related to TT occurring or not. Both ruler-shaped paired twinning and lenticular twinning would provide effective mechanisms to release or reduce the stress concentration in front of the twin tips in different grain pairs.