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Properties of superconducting CU-rich composites containing V_3SI or V_3GA


Chen, Wilkie Yung-Kee (1975) Properties of superconducting CU-rich composites containing V_3SI or V_3GA. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/4FAM-6K11.


Superconducting Cu-rich composites containing the A-15 compounds V3Si or V3Ga have been made by the "Tsuei" process, which consists of melting the constituent elements into ingots followed by subsequent cold working and heat treatment. The superconducting transition temperatures of the resulting composites have been measured. X-ray diffraction analyses have been performed to identify the phases in the alloys. The microstructures have been studied using both the optical metallograph and the scanning electron-microscope. For some composites containing V3Ga, the critical current densities as functions of transverse magnetic field up to 60 kG, and as functions of temperature from 4.2°K to 12°K have been measured. It was found that the Tsuei process does not work for the composites containing V3Si, but works satisfactorily for the composites containing V3Ga. The reasons are discussed based on the results of microstructure studies, electrical resistivity measurements, and also the relevant binary phase diagrams. The relations between the measured properties and the various metallurgical factors such as the alloy compositions, the cross-section reduction ratios of the materials, and the heat treatment are discussed. The basic mechanism for the observed superconductivity in the materials is also discussed. In addition, it was found that the Tsuei composites are expected to have high inherent magneto-thermal stability based on the stability theory of superconducting composites.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Applied Physics
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Applied Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Duwez, Pol E. (advisor)
  • Tsuei, Chang-chyi (co-advisor)
Thesis Committee:
  • Unknown, Unknown
Defense Date:24 June 1974
Record Number:CaltechTHESIS:07172014-081159687
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8547
Deposited By: Benjamin Perez
Deposited On:17 Jul 2014 15:26
Last Modified:17 May 2024 00:26

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