冷脆的难熔金属 ,特别是Cr、Mo和W的脆性 ,在室温下是它们的主要缺点 ,它们的这种脆性是因为存在着一定方向的原子间键 ,例如共价键、原子或电子排列有序化等。另一种观点认为 ,门捷列夫元素周期表中的VA (V ,Nb ,Ta)族和VIA (Cr ,Mo ,W )族过渡金属的脆性 ,与金属中存在N ,O , The brittleness of cold brittle refractory metals, especially Cr, Mo and W, is their major drawback at room temperature and their brittleness is due to the presence of a certain direction of inter-atomic bonds such as covalent bonds, atoms or electrons Arranged in order and so on. Another view is that the fragility of the transition metals of the VA (V, Nb, Ta) and VIA (Cr, Mo, W) families in the Mendeleev’s Periodic Table is related to the presence of N, O,