Microstructure tailoring of Al-containing compositionally complex alloys by controlling the sequence of precipitation and ordering
نویسندگان
چکیده
• Refractory metal-based compositionally complex alloys exhibit a two-phase microstructure. The room temperature crystal structure can be tailored by the phase transition sequence. Differential scanning calorimetry reveals both, order reaction and separation. Al concentration has significant influence on reaction. metal-based, Al-containing (RCCA) are promising candidates for high-temperature structural applications. To shed light transitions, thermodynamic calculations were performed to select two representative with different sequences in transitions. Samples of these compositions synthesized arc melting pure elements followed homogenization treatment experimentally verify microstructure assess (DSC), (SEM) transmission electron microscopy (TEM) studies after quenching revealed multiple distinct transitions: (i) 82(TaMoTi)-8Cr-10Al (in at.%) exhibits solid-state separation concurrent ordering precipitates. This results disordered matrix ordered Thermal analysis indicates that while cooling from A2 phase, spread out over large range (approx. 750 – 1250°C), peak at 1055°C. (ii) In 77(TaMoTi)-8Cr-15Al alloy, continuous 1155°C leads single-phase B2 planar faults. At slightly lower temperatures 1096°C), occurs resulting segregation faults both investigated compositions, is enriched Ta Mo. Conversely, Ti, Cr uniformly distributed phases.
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ژورنال
عنوان ژورنال: Acta Materialia
سال: 2021
ISSN: ['1873-2453', '1359-6454']
DOI: https://doi.org/10.1016/j.actamat.2021.117217