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On The Relationship Between Valence Electron Concentration and Superconducting Properties of Refractory Complex Concentrated Alloys

Kumar, Ravi
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1733838870033528

Abstract Details

2024, MS, University of Cincinnati, Engineering and Applied Science: Materials Science.
Refractory complex concentrated alloys (RCCAs) are known for their high-temperature mechanical properties, but less attention has been given to their low-temperature thermophysical behavior. High-throughput calculation of phase diagrams (CALPHAD) was used to study the body centered cubic (BCC) phase dominance within the Nbx(MoTi2V4)100-x alloy system by adding Niobium (Nb) at atomic concentrations of x=9%,23%,and 37%, and two additional alloys where vanadium (V) is substituted with hafnium (Hf) and zirconium (Zr) to form Hf10Mo24Nb38Ti28 and Mo24Nb38Ti28Zr10 alloys. Alloys were tested to see the effect of Nb content on the superconducting transition temperature (TC) and the effect of substituting V with Hf or Zr on TC. This approach tests the common assumption of the correlation between VEC with TC, to clarify the role of composition relative to VEC. Button specimens were cast via vacuum arc melting and were measured for electrical resistivity at different temperatures using a Quantum Design DynaCool system. X-ray diffraction (XRD) was used to confirm the formation of the phases predicted by CALPHAD. Five out of the six alloy samples exhibited superconductivity, with some anomalies observed and addressed in this study. These results are compared to literature to enhance understanding of the results.
Eric Payton, Ph.D. (Committee Chair)
Matthew Steiner, Ph.D. (Committee Member)
Sarah Watzman, Ph.D. (Committee Member)
105 p.
Materials Science
Superconductivity; Refractory alloys; Valence electron concentration; CALPHAD; Entropy of mixing

Recommended Citations

Citations

  • Kumar, R. (2024). On The Relationship Between Valence Electron Concentration and Superconducting Properties of Refractory Complex Concentrated Alloys [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1733838870033528

    APA Style (7th edition)

  • Kumar, Ravi. On The Relationship Between Valence Electron Concentration and Superconducting Properties of Refractory Complex Concentrated Alloys. 2024. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1733838870033528.

    MLA Style (8th edition)

  • Kumar, Ravi. "On The Relationship Between Valence Electron Concentration and Superconducting Properties of Refractory Complex Concentrated Alloys." Master's thesis, University of Cincinnati, 2024. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1733838870033528

    Chicago Manual of Style (17th edition)

ucin1733838870033528
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© 2024, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.
Release 3.2.12