Metallurgy Division - Quarterly Prog Rpt [Jul 31, 1952]

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Additional experiments at 779OC are planned in order t o make certain that the minor phase disappears when equilibrium conditions are obtained. Etching of the silver-zirconium alloys by electrolytic means has been highly satisfactory in the regions o f the zirconium-rich solid solutions, but t h i s method p i t s and stains the surface badly as the silver content i s increased. The best method found for preparing alloys that contain the AgZr, or AgZr phases i s t o polish by hand and t o chemically etch the surface with one of the following reagents: 1% HF + 49% glycerine + 50% HNO,, 1% HF + 1% HF + 49% glycerine + 50% acetic 49% glycerine + 50% alcohol, acid.

The thermal analysis ingots w i l l be arc melted a number of times and then heated for long periods of time t o make them uniform i n composition. This uniformity w i l l be tested by chemical analysis o f the center and surface o f the ingots. The thermal analysis w i l l then be conducted with a sensitive potentiometer by the method o f Hume-Rothery and R a y n ~ r . ( ~ ) A quenching arrangement using silicone diffusion pump o i l as the quenching medium has been made for the continuously pumped, mullite, tube furnace.

7 annealed at 779°C. Additional experiments at 779OC are planned in order t o make certain that the minor phase disappears when equilibrium conditions are obtained. Etching of the silver-zirconium alloys by electrolytic means has been highly satisfactory in the regions o f the zirconium-rich solid solutions, but t h i s method p i t s and stains the surface badly as the silver content i s increased. The best method found for preparing alloys that contain the AgZr, or AgZr phases i s t o polish by hand and t o chemically etch the surface with one of the following reagents: 1% HF + 49% glycerine + 50% HNO,, 1% HF + 1% HF + 49% glycerine + 50% acetic 49% glycerine + 50% alcohol, acid.

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