文献类型：期刊文献

英文题名：Micromechanical interaction and plasticity of B2-O phases in Ti?AlNb

作者：Dong, Yahui[1,2]; Wan, Shijia[1,2]; Wang, Yiheng[1,2]; Su, Ting[1,2]; Wang, Yanju[3]; Yan, Yabin[1,2]; Xuan, Fu-Zhen[1,2]

机构：[1] Shanghai Key Laboratory of Intelligent Sensing and Detection Technology, East China University of Science and Technology, Shanghai, 200237, China; [2] School of Mechanical and Power Engineering, Key Laboratory of Pressure Systems and Safety of Ministry of Education, East China University of Science and Technology, Shanghai, 200237, China; [3] Materials Evaluation Center for Aeronautical and Aeroengine Application, AECC Beijing Institute of Aero-nautical Materials, Beijing, 100095, China

年份：2026

卷号：314

外文期刊名：International Journal of Mechanical Sciences

收录：EI(收录号：20260820106398)

语种：英文

外文关键词：Aluminum alloys - Niobium alloys - Phase boundaries - Plasticity - Single crystals - Stress analysis - Superconducting materials - Ternary alloys

摘要：This study investigates the deformation behavior of Ti?AlNb micropillars with diameters of 1 μm, 2 μm, and 3 μm, focusing on the interaction between phase boundaries and plastic deformation mechanisms using in-situ micropillar compression experiments and dual-phase crystal plasticity simulations. We introduce a new understanding of the size-dependent strength and plasticity transitions observed across varying pillar sizes and O-phase distributions. Notably, this study reveals that plastic slip transfer across the B2/O phase boundary is influenced by the geometric alignment of slip systems, providing new insights into interphase slip mechanisms. Experimental results show that O-phase alignment parallel to the loading direction limits plastic slip, while the size effect leads to a decrease in yield strength from 537.2 MPa to 278.5 MPa as micropillar diameter increases. Additionally, CPFEM simulations quantify the stress partitioning at the B2/O interface, revealing how stress differences attenuate with increasing pillar size. This work highlights the critical roles of microstructure, size effects, and interphase interactions in the mechanical behavior of Ti?AlNb alloys, offering novel insights into the plasticity mechanisms at small scales. ? 2026