中文摘要：

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。

英文摘要：

The Mo-La2O3 slab was prepared by liquid-liquid doping and powder metallurgy,and then rolled into plate.After annealing at different temperature,the tensile strength of the Mo-La2O3 plate was tested at room temperature.The fracture surface of the Mo-La2O3 plate and its La2O3 content and distribution were analyzed by SEM and EDS.The results show that the elongation of the Mo-La2O3 plate is higher than pure molybdenum plate.The room temperature tensile strength of the Mo-La2O3 plate increases significantly with the La2O3 content increasing.The dimple-shaped fracture changes into a cleavage-type one with annealing temperature rising.La2O3 is distributed in the grain or on grain boundary,which can greatly reduces the impurity content on grain boundary,inhibit the growth of microscopic holes and micropores,and then improve the strength and toughness of molybdenum plate.