. Alloys of tungsten by diffusion. Furnace No. 3 Time 2 hours Temperature .... 1600° C. Etched EF Photomicrograph • . x 100 The microstructure ofthis alloy is shown in The dark lines in-dicate the separation of car-bon as free graphite from amatrix of a tungsten-nickelalloy. Fig. XXIII. 1^. Fig. XXIV. 28 Experiment 2 Furnace Ho, 3 Time 10 hours temperature • • • . 1500° tched Photomicrograph • . z 100 This alloy is somewhathigher in tungsten than al-loy 1. The time of heatinghas also been microstructure () seems to show the for-mation of the double carbi
. Alloys of tungsten by diffusion. Furnace No. 3 Time 2 hours Temperature .... 1600° C. Etched EF Photomicrograph • . x 100 The microstructure ofthis alloy is shown in The dark lines in-dicate the separation of car-bon as free graphite from amatrix of a tungsten-nickelalloy. Fig. XXIII. 1^. Fig. XXIV. 28 Experiment 2 Furnace Ho, 3 Time 10 hours temperature • • • . 1500° tched Photomicrograph • . z 100 This alloy is somewhathigher in tungsten than al-loy 1. The time of heatinghas also been microstructure () seems to show the for-mation of the double carbideon long heating in this sys-tem, as shown by lighterportions of picture. Complete fusion has occurred in the case of both alloys. The matrix inFig. XXIV. is a tungsten-nickel alloy rich in tungsten. 29 III. Summary 1. A set of three furnaces has been arranged in which the vari-ous requirements of this problem, as to time, temperature, re-ducing atmosphere, and temperature control, have been largely-met. 2. A series of binary diffusion alloys of tungsten have beenprepared and studied. 3. A series of ternary diffusion alloys have been prepared andstudied. IV. Conclusions 1. Tungsten forms diffusion alloys quite readily with the fol-lowing metals: tin, antimony, cadmium, aluminum, iron
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttheses, bookyear1920
