TY - GEN A1 - Liu, Xu A1 - Song, Lin A1 - Liu, Tong A1 - Stark, Andreas A1 - Pyczak, Florian A1 - He, Zhanbing A1 - Lin, Junpin A1 - Zhang, Tiebang T1 - In- and ex-situ study of the deformation behavior of the βo(ωo) phase in a Ti4Al3Nb alloy during high-temperature compression T2 - Journal of Alloys and Compounds N2 - In-situ synchrotron-based high energy X-ray diffraction (HEXRD) and ex-situ Gleeble tests were conducted to investigate the deformation behavior of the βo(ωo) phase in a Ti4Al3Nb alloy. In samples compressed at 600 and 800 °C, the brittle ωo phase deforms mostly elastically, resulting in the failure of the Ti4Al3Nb alloy by premature fracture. In a sample deformed at 900 °C, the ωo phase mostly transforms into the βo phase under uniaxial loading. Moreover, the ductility of a Ti4Al3Nb alloy is largely enhanced at this temperature. In a sample deformed at 1000 °C, dynamic recrystallization (DRX) of the βo phase extensively takes place. Direction 1 (D1) and Direction 2 (D2) deviating from the loading direction with an angle of 65° ± 5° and 15° ± 5° are selected to analyze the lattice strain evolution of (110)βo lattice planes. At the late stage of macro strain hardening, deformed[removed]βo//D1 oriented grains bear a higher load due to the occurrence of DRX in[removed]βo//D2 oriented grains. Subsequently, DRX continues in[removed]βo//D1 oriented βo grains. The coordinated deformation of βo grains ensures the good deformability of a Ti4Al3Nb alloy at 1000 °C. Y1 - 2022 U6 - https://doi.org/10.1016/j.jallcom.2022.165626 SN - 0925-8388 VL - 918 ER - TY - GEN A1 - Liu, Xu A1 - Song, Lin A1 - Stark, Andreas A1 - Lorenz, Uwe A1 - He, Zhanbing A1 - Lin, Junpin A1 - Pyczak, Florian A1 - Zhang, Tiebang T1 - Deformation and phase transformation behaviors of a high Nb-containing TiAl alloy compressed at intermediate temperatures T2 - Journal of Materials Science and Technology N2 - In modern β-solidified TiAl alloys, the decomposition of α2 phase is frequently observed during heat treatment or high-temperature deformation of the alloys. In this study, high-temperature deformation and decomposition mechanisms of α2 phase in a Ti-45Al-8.5Nb-0.2B-0.2W-0.02Y alloy are investigated. In a sample deformed at 800 °C, the precipitation of βo(ωo) phase is observed within the equiaxed α2 phase. The nucleation of ωo particles within the βo matrix indicates the α2→βo→ωo transformation. In addition, numerous γ phase precipitates form within the βo(ω) areas. The α2 lamellae decompose into ultrafine (α2+γ) lamellae and coarsened γ lamellae via α2→α2+γ and α2→γ transformation, respectively. Moreover, the ωo phase nucleates within the ultrafine lamellae via α2→ωo transformation. However, in a sample deformed at 1000 °C, the nucleation of βo particles is sluggish, which is caused by the efficient release of the internal stress via dynamic recrystallization (DRX). These results indicate that complex phase transformations can be introduced by the decomposition of α2 phase in TiAl alloys with a high amount of β-stabilizing elements. Y1 - 2022 U6 - https://doi.org/10.1016/j.jmst.2021.06.041 SN - 0861-9786 VL - 102 SP - 89 EP - 96 ER - TY - GEN A1 - Han, Liuliu A1 - Xu, Xiandong A1 - Wang, Li A1 - Pyczak, Florian A1 - Zhou, Rui A1 - Liu, Yong T1 - A eutectic high-entropy alloy with good high-temperature strength-plasticity balance T2 - Materials Research Letters Y1 - 2019 SN - 2166-3831 VL - 7 IS - 11 SP - 460 EP - 466 ER - TY - GEN A1 - Shen, Jianqi A1 - Yu, Bin A1 - Riebel, Ulrich A1 - Xu, Yamin A1 - Liu, Lei A1 - Guo, Xiaoai T1 - Fundamentals of Particle Size Analysis by Fluctuating Transmission Autocorrelation with an Extremely Narrow Beam Y1 - 2008 U6 - https://doi.org/10.1016/j.measurement.2006.11.021 ER - TY - GEN A1 - Liu, Xu A1 - Stark, Andreas A1 - Pyczak, Florian A1 - Zhang, Tiebang T1 - In-situ synchrotron high energy X-ray diffraction study on the internal strain evolution of D019-α2 phase during high-temperature compression and subsequent annealing in a TiAl alloy T2 - Journal of Materials Science and Technology Y1 - 2023 U6 - https://doi.org/10.1016/j.jmst.2023.04.027 SN - 1941-1162 SN - 1005-0302 VL - Vol. 163 SP - 212 EP - 222 ER - TY - GEN A1 - Guo, Xiang A1 - Song, Lin A1 - Liu, Xu A1 - Stark, Andreas A1 - Pyczak, Florian A1 - Zhang, Tiebang T1 - In-situ synchrotron HEXRD study on the phase transformation mechanisms of the ω-related phases in a Ti4Al3Nb alloy T2 - Materials Characterization Y1 - 2023 U6 - https://doi.org/10.1016/j.matchar.2023.112901 SN - 1873-4189 SN - 1044-5803 VL - Vol. 200 ER -