Conclusions
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1.
The ÉI827 alloy, in the state investigated, has good mechanical properties at very low temperatures (down to the temperature of liquid hydrogen). Along with a relatively high strength (about 140 kg/mm2 at −253°C) it has high ductility: δ=47%, ψ=40%. The ductility remains unchanged between +20 and −253°C.
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2.
Deformation at room temperature leads to deformational aging. The amount of the excess phase (apparently Ni, Al) increases by 3%. At the temperatures of boiling liquid nitrogen and hydrogen there is no deformational aging.
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Literature cited
D. V. Lebedev, B. V. Molotilov, and B. M. Ovsyannikov, Zavodskaya laboratoriya, No. 4 (1964).
Additional information
Central Scientific Research Institute of Ferrous Metallurgy Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 64–65, March, 1966
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Lebedev, D.V., Maslenkov, S.B. & Ovsyannikov, B.M. Mechanical properties of the ÉI827 alloy at low temperatures. Met Sci Heat Treat 8, 243–244 (1966). https://doi.org/10.1007/BF00660400
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DOI: https://doi.org/10.1007/BF00660400