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    Item type:Publication, Access status: with files ,
    Phase separation and up-hill diffusion in the ordered α2 compound of a γ-Ti-Al-Nb alloy
    (EDP Sciences, 2020-10-12)
    Gabrisch, Heike
    ;
    Krekeler, Tobias
    ;
    Lorenz, Uwe
    ;
    Rackel, Marcus Willi
    ;
    Ritter, Martin
    γ-TiAl alloys are intermetallic materials that are designed for applications in air craft engines. Oftentimes alloying elementsare added to improve the corrosion resistance and mechanical properties. Here we investigate microstructural changes thattake place when Nb is added to a binary γ-TiAl alloy. Previous studies of the alloy Ti-42Al-8.5Nb have shown that uponNb addition the orthorhombic O-phase forms out of the parent α2 phase within the alloy’s microstructure. During annealingNb segregates to the newly formed O-phase while Al and Ti partition to the remaining α2-like matrix phase. The changesthese newly formed O-phase domains undergo with time at elevated temperature are not known. Here we use TransmissionElectron Microscopy techniques to monitor the distribution of Nb and the size of O-phase domains during long-termannealing between 1 week and 4 weeks at 550°C. The results show that the size of O-phase domains shrinks withannealing time. At the same time the Nb concentration remains largely constant or possibly shows a small decrease.
    Publicationtype: Conference Paper
      45  83
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    Item type:Publication, Access status: with files ,
    Comparison of three methods of length compensation in a parallel kinematic and their equivalence conditions
    (EDP Sciences, 2018-06)
    Du, Shucen
    ;
    Schlattmann, Josef
    ;
    Schulz, Stefan
    ;
    Seibel, Arthur
    This paper is a further development of a previous work (PAMM 16, 51-52). In this paper, we derive an analytical formulation of the linear actuators' length variations for a 2-1-2 DOF joint designed parallel hexapod based on Riebe and Ulbrich's method (Arch. Appl. Mech. 72, 817-829) and the Euler angles based matrix method. The equivalence conditions as well as the computation errors are given and compared with a quaternion based method.
    Publicationtype: Conference Paper
    Scopus© Citations 2  263  290