Abstract
The corrosion and serration behaviors of TiZr0.5NbCr0.5, TiZr0.5NbCr0.5V and TiZr0.5NbCr0.5Mo high entropy alloys (HEAs) in NaCl and H2SO4 solutions were studied by potentiodynamic polarizations (PP) and immersion tests. The results show that all the alloys display excellent corrosion resistance no matter in NaCl solution or in H2SO4 solution. The additions of V and Mo increase the pitting corrosion resistance for the three alloys in NaCl solution slightly and greatly improve the corrosion resistance in H2SO4 solution. The corrosion behaviors of TiZr0.5NbCr0.5 and TiZr0.5NbCr0.5Mo alloys are more sensitive to temperature than that of TiZr0.5NbCr0.5V alloy. After immersion, the surface of TiZr0.5NbCr0.5 alloy appears some pitting holes, this may be related to the electrochemical noise and serration behavior on PP curves; localized corrosion initiates mainly on the boundaries of the BCC and Cr2Zr Laves phase for TiZr0.5NbCr0.5V alloy; while for the TiZr0.5NbCr0.5Mo alloy, the dendrites with Mo element rich region exhibit poor corrosion resistance.
Highlights
High-entropy alloys (HEAs), which may be defined as alloys that generally contain more than three principal elements and each of them has an atomic percentage more than 5 at.% [1,2,3,4,5,6,7], have attracted increasing attentions due to their extensive applications prospect
All the alloys exhibit the reflections of a body center cubic (BCC) disordered solid solutions (DSS) phase and an ordered Cr2Zr phase, indicating that the additions of V or Mo have little effect on the phase constitution of TiZr0.5NbCr0.5 alloy and only make the diffraction peaks shift to the right side
)among all the constituent elements, we can see that Zr has the most negative mixing enthalpy with Cr, and this may be the reason why intermetallic compound phase Cr2Zr forms
Summary
High-entropy alloys (HEAs), which may be defined as alloys that generally contain more than three principal elements and each of them has an atomic percentage more than 5 at.% [1,2,3,4,5,6,7], have attracted increasing attentions due to their extensive applications prospect. The particular structure makes multi-component HEAs exhibit excellent properties, such as high strength [7], high ductility [9,10], well magnetic properties [11], excellent resistances to wear, oxidation, irradiation and corrosion [5,12,13], and high thermal stability [14].
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
