Conclusions
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1.
It was found that zinc, copper, misch metal, and calcium do not affect the solubility of zirconium in magnesium but promote refining of the structure of the Mg-Zr alloy, while nickel, manganese, silicon, tin, aluminum, beryllium, and iron lower the solubility of zirconium and promote coarsening of the structure.
A lower solubility of zirconium in magnesium is promoted by elements which combine with zirconium to form compounds with melting points above 1200°C.
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2.
We established the maximum quantities of mangenese, silicon, tin, aluminum, beryllium, and iron which are acceptable as impurities in magnesium alloys with zirconium.
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3.
We determined the joint solubilities of impurities of zirconium and iron in the molten ML5 alloy. We found that the zirconium solubility decreases with increasing iron concentrations.
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3.
We propose an effective means of reducing the harmful zirconium impurity in the ML5 alloy to 0,0015%. It consists of enriching the alloy with iron by overheating to 900°C and holding at this temperature 30 min.
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Literature cited
A. Schneider and B. Strau, Aluminium, No. 11 (1961).
E. Emley, J. Institute of Metals,75, No. 6 (1949).
F. Ewyk, Modern Metals,7, No. 3 (1951).
M. V. Mal'tsev, Modification of the Structure of Metals and Alloys [in Russian], Metallurgiya, Moscow (1964).
Additional information
Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 61–64, March, 1968.