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采用液-液掺杂并结合粉末冶金的方法制备了不同稀土氧化镧含量(0.5%～1.5%)的掺杂钼坯,轧制成钼板材后,研究了钼板高温拉伸性能,并利用SEM、EDS和显微镜对钼合金的组织和断口形貌进行了分析。结果表明:氧化镧不仅细化了钼合金晶粒,还提高了钼板的再结晶温度,在1200℃,纯钼板晶粒基本长成等轴晶,而氧化镧钼板的晶粒细小且长径比大。随着氧化镧掺杂量的提高,氧化镧钼板强度逐渐增大,而伸长率在掺杂量为1.0%时最佳。纯钼板在1000℃之后转成脆性断裂,而氧化镧钼板在试验温度范围内始终是塑性断裂。
The doped molybdenum blank with different content of lanthanum oxide (0.5% -1.5%) was prepared by liquid-liquid doping combined with powder metallurgy. After rolling into molybdenum sheet, the tensile properties of molybdenum sheet at high temperature were studied. The microstructure and fracture morphology of molybdenum alloy were analyzed by SEM, EDS and microscopy. The results show that lanthanum oxide not only refine the grain of molybdenum alloy, but also increase the recrystallization temperature of molybdenum plate. At 1200 ℃, the grain of pure molybdenum plate grows into equiaxed crystal basically, while the grain of lanthanum oxide molybdenum plate is small Large aspect ratio. With the increase of lanthanum oxide doping amount, the strength of lanthanum oxide molybdenum plate gradually increases, while the elongation is best when the doping amount is 1.0%. Pure molybdenum plate into brittle fracture after 1000 ℃, and lanthanum oxide molybdenum plate in the test temperature range is always plastic fracture.