文献类型：期刊文献

英文题名：Micromechanical interaction and plasticity of B2-O phases in Ti2AlNb

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]East China Univ Sci & Technol, Shanghai Key Lab Intelligent Sensing & Detect, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[3]AECC Beijing Inst Aeronaut Mat, Mat Evaluat Ctr Aeronaut & Aeroengine Applicat, Beijing 100095, Peoples R China

年份：2026

卷号：314

外文期刊名：INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001696201500001)】；

基金：Y. Yan thanks the support of National Natural Science Foundation of China (Grant No. 52275149 and U2468210) . F.Z. Xuan thanks the support of Science Fund for Creative Research Groups of the National Natural Science Foundation of China (Grant No. 52321002) and National Natural Science Foundation of China (Grant No. 51835003) . Y. Wang thanks the support of National Science and Technology Major Project (No. J2009-VI-0003-0116) , WDZC program of BIAM (Grant No.2019-363) ,and Advanced Materials-National Science and Technology Major Project (2025ZD0609100) .

语种：英文

外文关键词：Titanium alloys; Mechanical characterization; Crystal plasticity; Ti2AlNb orthorhombic alloy; Interfacial slip transfer; In situ SEM micropillar compression

摘要：This study investigates the deformation behavior of Ti2AlNb micropillars with diameters of 1 mu m, 2 mu m, and 3 mu m, 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 Ti2AlNb alloys, offering novel insights into the plasticity mechanisms at small scales.