TY - GEN A1 - Wang, Li A1 - Wang, Yihao A1 - Pyczak, Florian A1 - Oehring, Michael A1 - Song, Min A1 - Liu, Yong T1 - Revealing complex planar defects and their interactions at atomic resolution in a Laves phase containing Co-base superalloy T2 - Acta Materialia Y1 - 2024 U6 - https://doi.org/10.1016/j.actamat.2023.119568 SN - 1359-6454 VL - 264 SP - 1 EP - 20 PB - Elsevier BV ER - TY - GEN A1 - Wang, Li A1 - Wang, Yihao A1 - Liang, Xiaopeng A1 - Liu, Bin A1 - He, Junyang A1 - Oehring, Michael A1 - Pyczak, Florian A1 - Liu, Yong T1 - Revealing the unique evolution and splitting behavior of carbides at atomic-scale in TiAl alloys : the role of elastic interactions and chemical fluctuations T2 - Acta materialia N2 - Cubic perovskite-Ti3AlC carbides are essential strengthening particles in TiAl alloys, especially for application above 800 °C where coarsening is expected to occur. However, these carbides can decompose into small sub-particles upon extended annealing, and the underlying atomic-scale mechanisms, especially structural and compositional changes, driving this unique splitting remain unclear. This study revisits this behavior in a Ti-45Al-5Nb-0.75C alloy utilizing probe-corrected transmission electron microscopy, atom probe tomography and first-principle calculations. The results reveal that the elastic interactions significantly influence carbide evolution. While needle-like carbides transform to intact plates during aging, those in high-density regions tend to coalesce or align along elastically softest γ-matrix directions, forming low-energy plate-like carbide conglomerates. With extended annealing, periodic chemical fluctuations driven by lattice misfit, especially along the needles induce splitting. Simultaneously, a γi-phase with a larger tetragonality and a 90°-rotated c-axis relative to the γ matrix emerges between the sub-particles, which exhibits near-zero lattice mismatch with carbides along [001], combined with mass-center shifts of carbides, further stabilizing the split configurations. This study provides atomic-scale insights into the evolution and stability of strengthening precipitates in systems with tetragonal misfit, and offers new strategies for improving creep properties of TiAl alloys by tailoring carbide configurations. KW - Titanium aluminides KW - Carbides KW - Morphology KW - Elastic interaction KW - STEM HAADF Y1 - 2025 U6 - https://doi.org/10.1016/j.actamat.2025.121277 SN - 1359-6454 VL - 296 SP - 1 EP - 17 PB - Elsevier BV CY - Amsterdam ER - TY - GEN A1 - Li, Yuzhi A1 - Pyczak, Florian A1 - Oehring, Michael A1 - Wang, Li A1 - Paul, Jonathan A1 - Lorenz, Uwe A1 - Yao, Zekun T1 - Thermal Stability of gamma' phase in long-term aged Co-Al-W alloys T2 - Journal of Alloys and Compounds Y1 - 2017 SN - 0925-8388 VL - 729 SP - 266 EP - 276 ER - TY - GEN A1 - Wang, Li A1 - Oehring, Michael A1 - Li, Yuzhi A1 - Song, Lin A1 - Liu, Yon A1 - Stark, Andreas A1 - Lorenz, Uwe A1 - Pyczak, Florian T1 - Microstructure, phase stability and element partitioning of γ/γʹ Co-9Al-9W-2X alloys in different annealing conditions T2 - Journal of Alloys and Compounds Y1 - 2019 SN - 0925-8388 VL - 787 SP - 594 EP - 605 ER - TY - GEN A1 - Li, Yuzhi A1 - Pyczak, Florian A1 - Stark, Andreas A1 - Wang, Li A1 - Oehring, Michael A1 - Paul, Jonathan A1 - Lorenz, Uwe T1 - Temperature dependence of misfit in different Co–Al–W ternary alloys measured by synchrotron X-ray diffraction T2 - Journal of Alloys and Compounds Y1 - 2020 SN - 0925-8388 VL - 819 ER - TY - GEN A1 - Li, Longjun A1 - Wang, Li A1 - Liang, Zhida A1 - He, Junyang A1 - Qiu, Jingwen A1 - Pyczak, Florian A1 - Song, Min T1 - Effects of Ni and Cr on the high-temperature oxidation behavior and mechanisms of Co- and CoNi-base superalloys T2 - Materials and Design N2 - The high-temperature oxidation behaviors of Co- and CoNi-base alloys with different Ni and Cr additions were investigated by isothermal oxidation in air at 900 and 1000 °C. The structure, composition, and element distribution in the three layers within the oxide scales in different alloys have been explored in detail by electron microscopy, especially with regard to the fine oxide particles in the intermediate layer. Based on the microstructure and phase constitution of the oxide scales, the synergetic effects of alloying elements on the oxidation mechanisms and resistance have been elucidated in detail with the aid of CALPHAD calculation. Y1 - 2022 U6 - https://doi.org/10.1016/j.matdes.2022.111291 SN - 1873-4197 VL - 224 ER - TY - JOUR A1 - Jamaludin, Farah Hidayah A1 - Nordin, Nur Syahirra A1 - Li, Xinge A1 - Wong, Jie‐Wei A1 - Lim, Zhixian A1 - Wang, Lei A1 - Ma, Chunxin A1 - Zhao, Qian A1 - Wong, Tuck‐Whye A1 - Neffe, Axel T. A1 - Li, Tiefeng T1 - Recent Advances in the Field of Shape-Memory Polymer from Bio-Based Precursors: Review and Perspective JF - Polymer Reviews N2 - Shape-memory polymers (SMPs) are predominantly derived from nonrenewable resources due to their low production cost, wide availability, and refined techniques for processing and tailoring SMP properties. However, the heavy reliance on these nonrenewable resources poses significant concerns regarding resource depletion and the long-term sustainability of the technology. As petroleum-based resources, which have traditionally fueled the polymer industry, become increasingly scarce, it is imperative to develop bio-based SMPs. This shift is essential not just for resource conservation but to ensure the continued viability and sustainability of SMP technology in the face of dwindling petroleum supplies. This review provides an overview of bio-based SMPs, which are synthesized from renewable precursors or through chemical variation and functionalization of biopolymers. The molecular mechanism and design strategy for the shape-memory effect (SME), syntheses, unique characteristics and shape-memory performance for these bio-based SMPs are covered. Furthermore, this review highlights novel insights and proposes promising directions for the development of sustainable SMPs with comparable performance to their nonrenewable counterparts. By focusing on bio-based alternatives, this work aims to motivate the exploration and advancement of next-generation sustainable SMPs. Y1 - 2025 U6 - https://doi.org/10.1080/15583724.2024.2427827 SN - 1558-3724 VL - 65 IS - 1 SP - 199 EP - 249 PB - Informa UK Limited ER - TY - GEN A1 - Li, Siyang A1 - Lok, Tow-Jie A1 - Ngo, Shi-Han A1 - Xue, Yaoting A1 - Miao, Zhikun A1 - Feng, Tao A1 - Wang, Lei A1 - Wong, Jie-Wei A1 - Low, Jiatee A1 - Lim, Kai-Yi A1 - Woon, Min-Rou A1 - Neffe, Axel T. A1 - Wong, Tuck-Whye A1 - Li, Tiefeng A1 - Yang, Xuxu A1 - Yang, Wei T1 - A water-recyclable, robust, and self-healing sugar-based supramolecular network enabled by Maillard-analogous initialization of polymerization T2 - Materials horizons N2 - Crosslinked functional polymers exhibit exceptional mechanical and chemical properties critical for applications spanning biomedical engineering, advanced adhesives, and self-healing materials. However, challenges in recycling, either due to irreversible crosslinks or, in the case of covalent adaptable networks (CANs), limited solid-state plasticity that typically requires catalysts, significantly restrict sustainability. To address these limitations, we present a novel water-mediated polymerization strategy inspired by the radical-generating mechanism of the Maillard reaction, utilizing maltose as both an initiator and a functional side group in a simple, catalyst-free, aqueous reaction with acrylamide (AAm). This mild, one-pot reaction occurs below 100 °C, forming adaptively functionalized supramolecular networks (AFSNs) that form supramolecular networks through hydrogen bonding and display dynamic imine linkages to the maltose side chains supporting self-healing and re-shaping. These elastomers are characterized by impressive mechanical strength (up to 5 MPa tensile strength), high elongation (up to 1000%), notable fracture energy (36 kJ m−2), robust adhesive performance (up to 4.8 MPa), and rapid self-healing capability at room temperature. Crucially, the elastomer's supramolecular network can be fully and repeatedly dissolved and reprocessed using only water, preserving mechanical integrity without chemical degradation. This sustainable approach provides a practical solution for synthesizing and recycling high-performance crosslinked materials while eliminating environmental hazards, guiding the future development of green polymer chemistry and functional material design. KW - Recycling KW - biobased polymer KW - self-healing KW - Maillard Y1 - 2026 U6 - https://doi.org/10.1039/D5MH01828E SN - 2051-6347 VL - 13 IS - 1 SP - 219 EP - 232 PB - Royal Society of Chemistry (RSC) CY - Cambridge ER - TY - THES A1 - Wang, Li T1 - Millimeter-wave Integrated Circuits in SiGe:C Technology KW - Integrierte Mikrowellenschaltung KW - Silicium KW - Germanium KW - MMiC Y1 - 2008 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:co1-opus-5993 ER - TY - GEN A1 - Wang, Li A1 - Pyczak, Florian A1 - Zhang, Jian A1 - Lou, Langhong A1 - Singer, Robert F. T1 - Effect of eutectics on plastic deformation and subsequent recrystallization in the single crystal nickel base superalloy CMSX-4 T2 - Materials Science and Engineering A Y1 - 2012 SN - 1873-4936 IS - 532 SP - 487 EP - 492 ER - TY - GEN A1 - Gabrisch, Heike A1 - Stark, Andreas A1 - Schimansky, Frank-Peter A1 - Wang, Li A1 - Schell, Norbert A1 - Pyczak, Florian T1 - Carbides in Ti-45Al-5Nb alloys with different carbon contents T2 - Intermetallics Y1 - 2013 SN - 0966-9795 IS - 33 SP - 44 EP - 53 ER -