Controlling crystallographic ordering in Mo–Cr–Ti–Al high entropy alloys to enhance ductility

Publication date: 15 May 2020Source: Journal of Alloys and Compounds, Volume 823Author(s): Stephan Laube, Hans Chen, Alexander Kauffmann, Steven Schellert, Franz Müller, Bronislava Gorr, Julian Müller, Benjamin Butz, Hans-Juergen Christ, Martin HeilmaierAbstractRefractory high entropy alloys (RHEAs) from the Mo–Cr–Ti–Al system exhibit promising strength at elevated temperatures. However, at room temperature they possess a B2-ordered crystal structure and, therefore, exhibit reduced ductility. Guided by thermodynamic calculations, the Al concentration was systematically reduced in MoCrTi-xAl (x = 25, 15, 10, 5, 3 at%) in order to achieve a disordered, solid solution with A2-type crystal structure even at room temperature. The alloys were manufactured by arc melting followed by a homogenization treatment. To evaluate the chemical homogeneity, backscatter electron (BSE) imaging and energy dispersive X-ray spectroscopy (EDS) were performed. Dynamic differential scanning calorimetry (DSC) and selected area diffraction utilizing transmission electron microscopy (TEM-SAD) were performed for the: (i) detection of the characteristic heat signatures of the disorder-order transformations and (ii) determination of the ordering state at room temperature of the synthesized alloys, respectively. In case of MoCrTi–3Al, a single-phase A2 crystal structure without indications of a disorder-order transformation was obtained. Compression tests at ...
Source: Journal of Alloys and Compounds - Category: Chemistry Source Type: research

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