"The present research is the result of interest in two rather broad, and at first thought, seemingly entirely separate topics: the structure of eutectics and x-ray microscopy. D. Hanson in 1923 in his correspondence with Albert M. Portevin in regard to his article on the structure of eutectics states, "A point that always stuck him (D. Hanson) in examining eutectics was that one of the constituents always formed a continuous phase round the other one. The orientation of one constituent was either constant or varied in a uniform manner. What, however, was the condition of the 'enveloped' constituent, which formed the small particles which were embodied in the continuous constituent? He had never seen any definite statement on that point, but he believed that, when dealing with the iron-carbon eutectoid, Colonel Belaiew expressed the opinion that the cementite was uniformly oriented throughout what was called a single pearlite grain. Did that apply to eutectics? Was the structure of the discontinuous or enveloped phase uniform throughout the colony or grain of eutectic?> He thought that was a somewhat important point, and, if that could be settled, it might help one to understand the method of crystallization of eutectics. The fact that one constituent was continuous and had a uniform orientation was surely important in studying the properties of the whole mass." To date no completely satisfactory answers have been given to these questions, although the fact that the individual particles in a eutectic are built up into a colony or aggregate, the structure of which is the same as that of any other crystal unit, has been shown in several ways. These will be discussed in a later section. In working with the application of various x-ray methods to metallurgy a new technique presented by Dr. C. S. Barrett was tried. The results obtained indicated that this method might be useful in determining answers to some of the questions quoted above"--Introduction, page 1-2.
Eppelsheimer, Daniel S., 1909-1988
Materials Science and Engineering
M.S. in Metallurgical Engineering
Missouri School of Mines and Metallurgy
vii, 86 pages
© 1950 John Stanton Winston, All rights reserved.
Thesis - Open Access
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Winston, John Stanton, "A study of cast eutectic structures by means of optical and x-ray microscopy" (1950). Masters Theses. 4880.