. Alloys of tungsten by diffusion. Fig. VII. Furnace . • . • . Ho. d Time 36 hours Temperature .... 1200° C. Unetched Photomicrograph . x 100 This specimen shows theformation of two distinct in-termetallic compounds, a mono-clinic crystal and a hexagonalcrystal. Campbell and Mathews^,by analysis, have shown these 16 to be respectively WAl^ (50$ ,¥)and WAI7 (5£$ tV). Figure Till,shows a crystal of the compoundWAI7 , magnified 355 dark portions in thisr tfiV figure are holes due to in- elusions of carbon. Experiment powder added to molten aluminum. Furnace No. 2 Time 2 h
. Alloys of tungsten by diffusion. Fig. VII. Furnace . • . • . Ho. d Time 36 hours Temperature .... 1200° C. Unetched Photomicrograph . x 100 This specimen shows theformation of two distinct in-termetallic compounds, a mono-clinic crystal and a hexagonalcrystal. Campbell and Mathews^,by analysis, have shown these 16 to be respectively WAl^ (50$ ,¥)and WAI7 (5£$ tV). Figure Till,shows a crystal of the compoundWAI7 , magnified 355 dark portions in thisr tfiV figure are holes due to in- elusions of carbon. Experiment powder added to molten aluminum. Furnace No. 2 Time 2 hours Temperature ..... 1200° C. The specimen was not ex-amined micro scopially nor wasit photographed. It showed,however, distinct crystals. Fig. VIII. of both kinds. The excess aluminum was dissolved out with diluteHC1 and, by the use of a hand lens, these could be easily separated The crystals were very hard and also very resistant toacid. They were not attacked by HC1 or EgS04. Campbell and Mathews, J. A. C. S. 24 (1902) p. 256 17 h. Tungsten and copper«
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttheses, bookyear1920
