. 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
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttheses, bookyear1920
