Abstract
In the presented article, a differential thermal analysis was carried out and the temperatures of thermal effects were established that arise during the reduction of neodymium from a technological salt mixture KCl–NaCl–CaCl2–NdF3 with a magnesium–zinc alloy. The results of experimental studies on the reduction of neodymium from a fluoride–chloride melt in a shaft electric furnace at temperatures of 550, 600, 650, 700 °C are presented. In order to increase the degree of extraction of neodymium into the Mg–Zn–Nd master alloy, the study of the influence of technological parameters on the degree of extraction of neodymium was carried out. It was experimentally proven that when zinc is added to a reducing agent (magnesium), the degree of extraction of neodymium into the master alloy is 99.5–99.7%. The structure of the obtained master alloy samples, characterized by a uniform distribution of ternary intermetallic compounds (Mg3,4NdZn7) in the volume of a double magnesium–zinc eutectic, was studied by optical and electron microscopy.
Highlights
The addition of neodymium into the magnesium–zinc–zirconium system leads to a change in the phase composition of magnesium-based alloys
It is known that the production of magnesium and aluminum alloys is carried out by dissolving in the melt double and ternary master alloys, which are produced by fusing the components, using metallothermic reduction of alloying components from their compounds or electrolysis [12,13,14,15]
It was found that ternary master alloys can be effectively used in the production of alloys based on light metals [19,20]
Summary
The addition of neodymium into the magnesium–zinc–zirconium system leads to a change in the phase composition of magnesium-based alloys. In this case, simultaneously with the known strengthening phases of magnesium with neodymium (for example, Mg12 Nd), phases of a more complex stoichiometric composition are formed, containing magnesium, neodymium, and zinc, for example Nd15 Mg65 Zn20 , Nd16 Mg37 Zn47 , Nd6 Mg41 Zn53 [1,2,3,4,5,6,7]. It was found that ternary master alloys can be effectively used in the production of alloys based on light metals [19,20]
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