Influence of Molybdenum on the Microstructure, Mechanical Properties and Corrosion Resistance of Ti20Ta20Nb20(ZrHf)20-xMox (Where: x = 0, 5, 10, 15, 20) High Entropy Alloys.

Karsten Glowka,Krystian Prusik,Dariusz Chrobak,Maciej Zubko,Magdalena Szklarska,Paweł Świec,János L Lábár,Danuta Stróż

doi:10.3390/ma15010393

Karsten Glowka, Krystian Prusik + Show 6 more

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https://doi.org/10.3390/ma15010393

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The presented work was focused on investigating the influence of the (hafnium and zirconium)/molybdenum ratio on the microstructure and properties of Ti20Ta20Nb20(ZrHf)20−xMox (where: x = 0, 5, 10, 15, 20 at.%) high entropy alloys in an as-cast state. The designed chemical composition was chosen due to possible future biomedical applications. Materials were obtained from elemental powders by vacuum arc melting technique. Phase analysis revealed the presence of dual body-centered cubic phases. X-ray diffraction showed the decrease of lattice parameters of both phases with increasing molybdenum concentration up to 10% of molybdenum and further increase of lattice parameters. The presence of two-phase matrix microstructure and hafnium and zirconium precipitates was proved by scanning and transmission electron microscopy observation. Mechanical property measurements revealed decreased micro- and nanohardness and reduced Young’s modulus up to 10% of Mo content, and further increased up to 20% of molybdenum addition. Additionally, corrosion resistance measurements in Ringers’ solution confirmed the high biomedical ability of studied alloys due to the presence of stable oxide layers.

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Since the dawn of time, people have modified metallic materials by adding new alloying elements and have developed new methods for producing and processing materials
Six-elemental high entropy Ti20Ta20Nb20(ZrHf)20−xMox alloys were produced from elemental powders and by vacuum arc melting techniques
Small amounts of Hf-Zr hexagonal precipitates were revealed by scanning–transmission electron microscope (STEM) microstructure analysis and recorded electron diffraction patterns

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Since the dawn of time, people have modified metallic materials by adding new alloying elements and have developed new methods for producing and processing materials. The first produced binary alloys were mainly composed of dominant metallic elements and one alloying element [1]. More advanced engineering materials containing more alloying elements in their microstructures were produced [2]. Novel materials produced by innovative methods consisting of more than two alloying elements belonged to the group of multicomponent alloys [3]. The idea of multicomponent alloys led to the new concept of materials containing many chemical elements with equiatomic ratios, such as high entropy alloys (HEAs) representing multi-principalelement materials. High entropy alloys are defined as alloys that are composed of at least five chemical elements in equiatomic or near-equiatomic ratios. Five-elemental, equiatomic Co20Cr20Fe20Mn20Ni20 Cantor’s alloy exhibited single-phase, faced-centered cubic (FCC) structure and dendritic microstructure [5]

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