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Interaction of {11■2} twin variants in hexagonal close-packed titanium

Journal of Materials Science & Technology 2019年第4期35卷 660-666页

作者： Xiaocui Li Jingwei Li Bo Zhou Mingchao Yu Manling Sui Institute of Microstructure and Property of Advanced Materials Beijing University of Technology

As multiple{11■2}twin variants are often formed during deformation in hexagonal close-packed(hcp)titanium,the twin-twin interaction structure has a profound influence on mechanical *** this paper,the twin-twin interaction structures of the{11■2}contraction twin in cold-rolled commercial purity titanium were studied by using electron backscatter diffraction(EBSD)and transmission electron microscopy(TEM).Formation of the{11■2}twin variants was found to deviate the rank of Schmid factor,and the non-Schmid behavior was explained by the high-angle grain boundary nucleation *** the observed twin-twin pairs manifested a quilted-looking structure,which consists of the incoming twins being arrested by the obstacle ***,the quilted-looking{11■2}twin-twin boundary was revealed by TEM and high resolution TEM ***-twinning,lattice rotation and curved twin boundary were observed in the obstacle twin due to the twin-twin reaction with the impinging twin.A twin-twin interaction mechanism for the{11■2}twin variants was proposed in terms of the dislocation dissociation,which will enrich the understanding for the propagation of twins and twinning-induced hardening in hcp metals and alloys.

关键词： HCP titanium {11■2} twin-twin interaction EBSD analysis TEM observation

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Stress field interaction during propagation of adjacent tensile twinning nuclei in magnesium

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Rare Metals 2019年第8期38卷 721-732页

作者： Zhe Li Ben Xu Qi Sun Qiu-Lin Li Wei Liu School of Materials Science and Engineering Tsinghua University Beijing 100084 China Daya Bay Nuclear Power Plant China Nuclear Power Engineering Co. Ltd Shenzhen 518000 China Joint Laboratory of Nuclear Materials and Service Safety Graduate School at Shenzhen Tsinghua University Shenzhen 518000 China

The shear stress field proximity to the twinning and prismatic/basal interfaces of {1012} tensile twins is shown by molecular dynamics *** stress field interacts and influences the twinning growth mode in the subsequent deformation process,which is simulated by changing the relative positions of the *** asymmetrical growth mode appears,in which the growth of one twin is predominant over the other when they are oriented at 45° to each *** growth mode is sensitive to the simulation temperature and strain rate and can be attributed to the interaction of the stress field proximity to the prismatic/basal interfaces and twinning planes.

关键词： twinning twin-twin interaction Stress field Molecular dynamics Magnesium

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