Conclusions
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1.
A study was made of the effect of 0.25 wt.% lanthanum and hafnium additions on the initial recrystallization temperature of tungsten. It was established that hafnium raises the initial recrystallization temperature of tungsten from 1200 to 1300°C; alloying with lanthanum fails to raise the initial recrystallization temperature of tungsten.
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2.
A 0.25 wt.% addition of hafnium lowers the brittle transition temperature of tungsten from 200 to 100°C, while alloying with lanthanum lowers the brittle transition temperature of tungsten in the recrystallized condition by 100–150°C.
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3.
Compared with unalloyed tungsten, hafnium-containing tungsten alloys retain good mechanical properties to higher temperatures.
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Literature cited
H. Braun and K. Sedlatschek, Current Metallurgical Topics [collected Russian translations], No. 2 (1961).
B. S. Lenient and I. Perlmutter, Current Metallurgical Topics [collected Russian translations], No. 1 (1961).
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Translated from Poroshkovaya Metallurgiya, No. 5(65), pp. 54–58, May, 1968.
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Borok, B.A., Dzneladze, Z.I. & Ershova, I.O. Some properties of tungsten and tungsten-base alloys. Powder Metall Met Ceram 7, 382–384 (1968). https://doi.org/10.1007/BF00774532
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DOI: https://doi.org/10.1007/BF00774532