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<p>Expansion tests were made for various temperature ranges between room temperature and 750 degrees C. on molybdenum ingots prepared from fine and coarse-grained molybdenum powders and on samples swaged to various diameters. The results are presented in figures and tables. Series 1 to 4 (molybdenum samples swaged to various diameters). - Some of the expansion curves or. heating show marked changes in the rote of expansion at about 350 degrees C. In most cases the plotted observations on cooling lie above the expansion curves on heating, so that after the expansion tests the specimens were longer than before these tests. For the samples prepared from fine-grained molybdenum powder the average coefficients of expansion between 25 and 500 degrees C. vary from 5.4*10/sup -6/ to 5.8*10/sup -6/ per degree centigrade, and for the samples prepared from coarse-grained powder the coefficients vary from 4.7*10/sup -6/ to 5.7*10/sup -6/. Series 5 (swaged and annealed samples). - The annealing was done in hydrogen gas at 1500 degrees C. The coefficients of expansion of the annealed samples of molybdenum are larger than the coefficients of the worked specimens. Several photomicrographs showing the structural changes that occurred in the samples of this series are included. Series 6" tests at high temperatures) - Forming gas was used for a neutral atmosphere in a high-temperature. furnace in two expansion tests on a sample of molybdenum. The annealing incident to the first test had no appreciable effect all the coefficients of expansion of the second test.
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<br>Subjects:</div>
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Hidnert, P. Gero, W.B.</div>
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