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。
Rare earth oxide-doped molybdenum billet were prepared by liquid-liquid doping and powder metallurgy process,and then rolled into sheets.The effect of La2O3 on high temperature tensile properties of Mo-La2O3 sheets was researched.The fracture surface of Mo-La2O3 sheets and the rare earth phase were analyzed by means of XRD,SEM,EDS and tensile test.The results show that La2O3 not only refines grains of Mo-La2O3 alloy,but also increases recrystallization temperature of the molybdenum sheets.At 1200 ℃,the grains of pure molybdenum sheet grow into equiaxed grains,while finer grains with larger aspect ratio in the Mo-La2O3 sheets are observed.With increasing the content of La2O3,tensile strength of the Mo-La2O3 sheets significantly increases,the maximum elongation of Mo-1.0%La2O3 sheet is obtained.The fracture surface of Mo-La2O3 sheets exhibits ductile fracture features at 900-1200 ℃.However,the pure molybdenum sheet shows brittle fracture characteristics at temperature higher than 1000 ℃.
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