研究了添加La2O3后钼的韧性及其韧化机制.借助于拉伸、弯曲方法测定了Mo-La2O3材料的断裂韧性KⅠC和韧脆转变温度(DBTT),并用SEM、TEM、AES等方法对Mo-La2O3材料的变形、断裂特征和组织结构进行了分析.研究结果表明:烧结态Mo-La2O3材料的KⅠC值达到24.76MPa·m1/2,是纯钼的2.5倍多,而且高于热锻空冷态TiC-ZrC-Mo钼合金.经1900℃退火的Mo-La2O3板,其韧脆转变温度降低至－60℃,较同样状态的纯钼板降低了80℃,故La2O3对钼具有显著的韧化效果.AES结果表明,添加La2O3并不改变C、N、O等致脆杂质在钼晶界上的分布状态.Mo-La2O3材料的韧化主要归因于其抗裂纹扩展能力的提高,而这与La2O3粒子改变钼中的位错分布及组态有关.并提出了一种新的韧化机制—硬脆第二相的韧化机制,能很好解释实验结果.
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