Analysis of Rare-Earth Phase in a W-Mo-Ni-Fe- Mn-La Heavy Alloy

摘要

Besides W-phase and Ni-phase, there is a micro new phase in W-Mo-Ni-Fe heavy alloy added with La and Mn. The micro phase can be extracted as an electrolytic residue by the following method: A mixture of the new phase and the Ni-phase is isolated when an alloy sample is electrolyzed in 5%NaOH + 1% tartaric acid solution. And the new phase can be isolated alone when the mixture is electrolyzed in 10% acetylacetone + 1%LiCl methanol solution. The result of the quantitative phase analysis indicates that the new phase is a complex oxide rich in La, W and Mn. The interfacial segregation of oxygen decreases and the binding force between W-Ni phases increases because of the existence of the oxide. So the mechanical properties of the alloy are improved.