Pd能用来作为添加元素改善Ti-Zr-Ni准晶合金的吸氢性能,但是Pd添加的作用机制仍然不清楚.本工作通过采用XRD、TEM、DSC分析技术研究了Pd在Ti45Zr38Ni17和Ti40Zr40Ni20两个合金中对Ti、Zr的替代行为.结果显示:在前1个合金中,替代4％-6％(原子分数,下同)Ti或4％Zr能够确保纯二十面体准晶形成;在后一个合金中,替代3％～4％Ti或3％以下Zr才能形成纯二十面体准晶.这说明Ti具有更高的替代极限.Ti39Zr38Ni17Pd6与Ti36Zr40Ni20Pd4两个衍生准晶合金在400℃温度下退火会转变为晶体相,而它们的初始准晶合金Ti45Zr38Ni17和Ti40Zr40Ni20在400℃仍然结构稳定,这反映出添加Pd后准晶合金的热力学稳定性变低.这种替代趋势和准晶稳定性的降低很可能归功于Pd具有适宜的原子尺寸.
参考文献
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