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采用液-液掺杂、粉末冶金的方法制备出Mo-La2O3板坯并轧制成板材,经不同温度退火后进行室温拉伸测试,并利用SEM和EDS等检测手段对其断口形貌、氧化镧含量及分布进行了分析。结果表明:Mo-La2O3板材的延伸率始终高于纯钼板;随着氧化镧含量的增加,Mo-La2O3板材的室温抗拉强度显著提高;而随退火温度的升高,Mo-La2O3板材的断口形貌由韧窝形转变为解理形;氧化镧均匀分布于晶内和晶界,大大降低了晶界上杂质的浓度,抑制了显微空穴和微孔的长大,从而提高了钼板的强度和韧性。
Mo-La2O3 slabs were prepared by liquid-liquid doping and powder metallurgy method and rolled into plates. After annealing at different temperatures, tensile tests were conducted at room temperature. The fracture morphology, oxidation Lanthanum content and distribution were analyzed. The results show that the elongation of Mo-La2O3 sheet is always higher than that of pure molybdenum sheet. With the increase of the content of lanthanum oxide, the tensile strength at room temperature of Mo-La2O3 sheet significantly increases. With the increase of annealing temperature, The morphology of the fracture surface is changed from dimple to cleavage shape. Lanthanum oxide is uniformly distributed in the grain boundary and the grain boundary, greatly reducing the concentration of impurities on the grain boundary, inhibiting the growth of micro-voids and micropores, thereby increasing Molybdenum plate strength and toughness.