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I. A vacuum x-ray diffractometer for high temperature studies. II. An investigation of the allotropic transformation of titanium

Citation

Willens, Ronald H. (1961) I. A vacuum x-ray diffractometer for high temperature studies. II. An investigation of the allotropic transformation of titanium. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechTHESIS:04112011-155942415

Abstract

A vacuum high temperature x-ray diffractometer has been designed and constructed to study metals, sensitive to oxygen and nitrogen contamination, up to 1200°C. The factors which affect the accuracy of the diffractometer method and the proper choice of extrapolation functions are discussed. It is shown that this instrument can determine lattice parameters with an accuracy of one part in forty thousand. The thermal expansion of titanium has been investigated to 650°C and the c/a parameter is found to increase rapidly above 400°C. This variation of c/a is correlated with other properties of titanium to formulate a band model. On the basis of this model it is shown that the electrons can give an appreciable positive contribution to the free energy as the transformation temperature is approached and it is proposed that this is the main factor causing the instability of the low temperature modification of titanium.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Engineering
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Engineering and Applied Science
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Duwez, Pol E.
Thesis Committee:
  • Buffington, Francis Stephan
  • DuMond, Jesse William Monroe
Defense Date:1 January 1961
Record Number:CaltechTHESIS:04112011-155942415
Persistent URL:http://resolver.caltech.edu/CaltechTHESIS:04112011-155942415
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6306
Collection:CaltechTHESIS
Deposited By: Tony Diaz
Deposited On:13 Apr 2011 16:36
Last Modified:26 Dec 2012 04:34

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