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    <title language="eng">Revealing complex planar defects and their interactions at atomic resolution in a Laves phase containing Co-base superalloy</title>
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      <lastName>Wang</lastName>
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      <firstName>Yihao</firstName>
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      <firstName>Min</firstName>
      <lastName>Song</lastName>
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      <firstName>Yong</firstName>
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    <title language="eng">Revealing the unique evolution and splitting behavior of carbides at atomic-scale in TiAl alloys : the role of elastic interactions and chemical fluctuations</title>
    <abstract language="eng">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.</abstract>
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      <language>eng</language>
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    <title language="eng">Thermal Stability of gamma' phase in long-term aged Co-Al-W alloys</title>
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    <parentTitle language="eng">Journal of Alloys and Compounds</parentTitle>
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    <title language="eng">Temperature dependence of misfit in different Co–Al–W ternary alloys measured by synchrotron X-ray diffraction</title>
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    <abstract language="eng">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.</abstract>
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      <firstName>Li</firstName>
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      <firstName>Junyang</firstName>
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    <parentTitle language="eng">Materials Science and Engineering A</parentTitle>
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      <lastName>Lorenz</lastName>
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      <firstName>Junpin</firstName>
      <lastName>Lin</lastName>
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      <firstName>Florian</firstName>
      <lastName>Pyczak</lastName>
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    <author>
      <firstName>Tiebang</firstName>
      <lastName>Zhang</lastName>
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    <title language="eng">A eutectic high-entropy alloy with good high-temperature strength-plasticity balance</title>
    <parentTitle language="eng">Materials Research Letters</parentTitle>
    <identifier type="issn">2166-3831</identifier>
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    <author>
      <firstName>Liuliu</firstName>
      <lastName>Han</lastName>
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    <submitter>
      <firstName>Florian</firstName>
      <lastName>Pyczak</lastName>
    </submitter>
    <author>
      <firstName>Xiandong</firstName>
      <lastName>Xu</lastName>
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    <author>
      <firstName>Li</firstName>
      <lastName>Wang</lastName>
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    <author>
      <firstName>Florian</firstName>
      <lastName>Pyczak</lastName>
    </author>
    <author>
      <firstName>Rui</firstName>
      <lastName>Zhou</lastName>
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    <author>
      <firstName>Yong</firstName>
      <lastName>Liu</lastName>
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    <publishedYear>2019</publishedYear>
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    <title language="eng">Site occupancy of alloying elements in the L12 structure determined by channeling enhanced microanalysis in γ/γ’ Co-9Al-9W-2X alloys</title>
    <parentTitle language="eng">Acta Materialia</parentTitle>
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    <author>
      <firstName>Li</firstName>
      <lastName>Wang</lastName>
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    <submitter>
      <firstName>Florian</firstName>
      <lastName>Pyczak</lastName>
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    <author>
      <firstName>Michael</firstName>
      <lastName>Oehring</lastName>
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    <author>
      <firstName>Yuzhi</firstName>
      <lastName>Liu</lastName>
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    <author>
      <firstName>Uwe</firstName>
      <lastName>Lorenz</lastName>
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    <author>
      <firstName>Florian</firstName>
      <lastName>Pyczak</lastName>
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    <publishedYear>2020</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
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    <title language="eng">Microstructure and phase transformations of omega_o-Ti4Al3Nb based alloys after quenching and subsequent aging at intermediate temperatures</title>
    <parentTitle language="eng">Journal of Alloys and Compounds</parentTitle>
    <identifier type="issn">0925-8388</identifier>
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    <author>
      <firstName>Lin</firstName>
      <lastName>Song</lastName>
    </author>
    <submitter>
      <firstName>Florian</firstName>
      <lastName>Pyczak</lastName>
    </submitter>
    <author>
      <firstName>Li</firstName>
      <lastName>Wang</lastName>
    </author>
    <author>
      <firstName>Tiebang</firstName>
      <lastName>Zhang</lastName>
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    <author>
      <firstName>Junpin</firstName>
      <lastName>Lin</lastName>
    </author>
    <author>
      <firstName>Florian</firstName>
      <lastName>Pyczak</lastName>
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    <completedYear/>
    <publishedYear>2020</publishedYear>
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    <language>eng</language>
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    <volume>186</volume>
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    <completedDate>2021-01-24</completedDate>
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    <title language="eng">New insights into high-temperature deformation and phase transformation mechanisms of lamellar structures in high Nb-containing TiAl alloys</title>
    <parentTitle language="eng">Acta Materialia</parentTitle>
    <identifier type="doi">10.1016/j.actamat.2020.01.021</identifier>
    <identifier type="issn">1873-2453</identifier>
    <identifier type="issn">1359-6454</identifier>
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    <enrichment key="Fprofil">1 Energiewende und Dekarbonisierung / Energy Transition and Decarbonisation</enrichment>
    <author>
      <firstName>Lin</firstName>
      <lastName>Song</lastName>
    </author>
    <submitter>
      <firstName>Florian</firstName>
      <lastName>Pyczak</lastName>
    </submitter>
    <author>
      <firstName>Fritz</firstName>
      <lastName>Appel</lastName>
    </author>
    <author>
      <firstName>Li</firstName>
      <lastName>Wang</lastName>
    </author>
    <author>
      <firstName>Michael</firstName>
      <lastName>Oehring</lastName>
    </author>
    <author>
      <firstName>Xingguo</firstName>
      <lastName>Hu</lastName>
    </author>
    <author>
      <firstName>Andreas</firstName>
      <lastName>Stark</lastName>
    </author>
    <author>
      <firstName>Junyang</firstName>
      <lastName>He</lastName>
    </author>
    <author>
      <firstName>Uwe</firstName>
      <lastName>Lorenz</lastName>
    </author>
    <author>
      <firstName>Tiebang</firstName>
      <lastName>Zhang</lastName>
    </author>
    <author>
      <firstName>Junpin</firstName>
      <lastName>Lin</lastName>
    </author>
    <author>
      <firstName>Florian</firstName>
      <lastName>Pyczak</lastName>
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  <doc>
    <id>30287</id>
    <completedYear/>
    <publishedYear>2022</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
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    <issue/>
    <volume>906</volume>
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    <completedDate>2023-02-04</completedDate>
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    <title language="eng">Atomic site occupancy of alloying elements and Laves phase stability in γ-γ′ Co-base superalloys</title>
    <abstract language="eng">The atomic site occupancy of alloying elements in the ZrCo2 and HfCo2 based Laves phases formed in the Co-9Al-9W-2Zr and Co-9Al-9W-2Hf alloys was experimentally determined by the combined techniques of energy-dispersive X-ray spectroscopy mapping with atomic resolution and the atom location by channeling enhanced microanalysis (ALCHEMI) method. The results show that both Al and W occupy the Zr site in the C15 and the Hf site in the C36 crystal structure. The atomic locations of Al and W were further confirmed by comparing calculated inelastic cross-sections with experimental ALCHEMI results. Using the determined atomic site occupancies of alloying elements, special quasirandom structure solid solution models with 192 atoms were constructed and employed in first-principles calculations. It is found theoretically that the energy of formation of the C15 structure is always lower than that of the C36 structure at 0 K in both ZrCo2 and HfCo2 phases, no matter whether Al and W are incorporated or not. However, further ab initio molecular dynamics simulations suggest that lattice vibration at finite temperature contributes significantly to the phase stability, stabilizing the C36 structure compared to the C15 type for the (Hf, Al, W)Co2 phase at finite temperature, which fits well with the experimental findings.</abstract>
    <parentTitle language="eng">Journal of Alloys and Compounds</parentTitle>
    <identifier type="doi">10.1016/j.jallcom.2022.164261</identifier>
    <identifier type="issn">1873-4669</identifier>
    <identifier type="issn">0925-8388</identifier>
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    <author>
      <firstName>Li</firstName>
      <lastName>Wang</lastName>
    </author>
    <submitter>
      <firstName>Florian</firstName>
      <lastName>Pyczak</lastName>
    </submitter>
    <author>
      <firstName>Yi</firstName>
      <lastName>Kong</lastName>
    </author>
    <author>
      <firstName>Michael</firstName>
      <lastName>Oehring</lastName>
    </author>
    <author>
      <firstName>Min</firstName>
      <lastName>Song</lastName>
    </author>
    <author>
      <firstName>Florian</firstName>
      <lastName>Pyczak</lastName>
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    <publishedYear>2023</publishedYear>
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    <language>eng</language>
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    <volume>Vol. 222</volume>
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    <completedDate>2024-02-02</completedDate>
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    <title language="eng">Stacking fault formation in perovskite Ti3AlC carbides in a TiAl based alloy during creep at 800°C</title>
    <parentTitle language="eng">Scripta Materialia</parentTitle>
    <identifier type="doi">10.1016/j.scriptamat.2022.115034</identifier>
    <identifier type="issn">1872-8456</identifier>
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    <submitter>
      <firstName>Florian</firstName>
      <lastName>Pyczak</lastName>
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    <author>
      <firstName>Li</firstName>
      <lastName>Wang</lastName>
    </author>
    <author>
      <firstName>Xiaopeng</firstName>
      <lastName>Liang</lastName>
    </author>
    <author>
      <firstName>Bin</firstName>
      <lastName>Liu</lastName>
    </author>
    <author>
      <firstName>Michael</firstName>
      <lastName>Oehring</lastName>
    </author>
    <author>
      <firstName>Jonathan David Heaton</firstName>
      <lastName>Paul</lastName>
    </author>
    <author>
      <firstName>Jie</firstName>
      <lastName>Liu</lastName>
    </author>
    <author>
      <firstName>Min</firstName>
      <lastName>Song</lastName>
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    <author>
      <firstName>Florian</firstName>
      <lastName>Pyczak</lastName>
    </author>
    <author>
      <firstName>Yong</firstName>
      <lastName>Liu</lastName>
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    <title language="eng">Morphology evolution of P-Ti3AlC carbides and their influence on creep properties in a crept Ti-45Al-5Nb-0.75C alloy</title>
    <parentTitle language="eng">Journal of Materials Research and Technology</parentTitle>
    <identifier type="doi">10.1016/j.jmrt.2024.02.146</identifier>
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    <title language="eng">Stress-induced orthorhombic O phase in TiAl alloys</title>
    <abstract language="eng">The orthorhombic O phase precipitation within the D019-α2 phase has attracted increasing attention recently in high Nb containing TiAl (high Nb-TiAl) alloys since the precipitation temperature is close to the expected service temperature of the alloys. In this study, in-situ synchrotron high energy X-ray diffraction (HEXRD) reveals that the O phase precipitates at 550 °C while it dissolves into the α2 phase at 750 °C during heat treatments. However, under external stress the O phase unexpectedly precipitates from α2 phase at 800 °C and even 900 °C. The O phase formation proceeds further in the presence of a critical stress promoted by internal stress accumulation in the α2 phase, whereas the reverse O→α2 phase transformation takes place when the internal stresses are relaxed. Additionally, it has been revealed that the O phase preferentially precipitates from specifically oriented α2 grains with one of their &lt;110&gt; directions aligned perpendicular and their 〈0001〉 directions rotated by an angle of 120° out of the external load axis. This α2 phase orientation facilitates the α2→O crystal transition during uniaxial compression. Transmission electron microscopy (TEM) study shows that stress-induced α2→O transformation is governed by small atomic shifts in the α2 lattice. In addition, the selective growth of certain O variants via shuffling along an [110]α2 direction is found to accommodate the external strain component in this direction.</abstract>
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