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稀土金属在改善钼的低温塑性及抗氧化性方面,所起的作用是为人们所关心的问题。钆、镧及钕能够降低钼的脆性转变温度,在钼中加入微量铈,对降低钼的脆性转变温度也有好处。在Ce-Mo,La-Mo,Gd-Mo及Dy-Mo系中均未发现中间相。据本文作者所知,有关钼-稀土相图除Mo-Y系外,文献上还缺少这方面的资料。本文介绍我们研究Mo-Gd相图的初步结果。配制样品所用原料为纯度99.95%的钼条及纯度为99.9%的金属钆。富钼部分每个样品重15克,高于25%钆,每个样品重5克。样品在非自耗炉钨极水冶钢坩埚内在纯化过的氩气氛下熔化。每个样品重复熔化6—8次。铸态样品在1000℃均匀化50小时。Mo-Gd合金金相样品的磨制在煤油中进行。煤油具有较小的粘度,能很好湿润金属
The role of rare earth metals in improving the low temperature plasticity and oxidation resistance of molybdenum is a matter of concern. Gadolinium, lanthanum, and neodymium can reduce the brittle transition temperature of molybdenum, adding a trace amount of cerium to molybdenum also has the benefit of reducing the brittle transition temperature of molybdenum. No mesophase was found in Ce-Mo, La-Mo, Gd-Mo and Dy-Mo systems. As far as the author of this paper is concerned, there is still a lack of information in this literature on molybdenum-rare earth phase diagrams except Mo-Y. This article presents the preliminary results of our study of the Mo-Gd phase diagram. The raw materials used in the preparation of the sample were molybdenum strips with a purity of 99.95% and metallic gadolinium with a purity of 99.9%. The molybdenum-rich portion weighs 15 grams per sample, higher than 25% gadolinium, and weighs 5 grams per sample. The sample was melted in a purified argon atmosphere in a non-consumable tungsten tungsten steel crucible. Each sample is melted 6-8 times repeatedly. The as-cast samples were homogenized at 1000 ° C for 50 hours. Mo-Gd alloy metallographic samples were ground in kerosene. Kerosene has a lower viscosity, good wetting of metals