Pd替代对Ti-Zr-Ni准晶合金中的相形成与稳定性影响（英文）

发布时间：2018-04-27 18:58

  本文选题：准晶 + Ti-Zr-Ni合金　； 参考：《稀有金属材料与工程》2015年04期

【摘要】：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。
[Abstract]:PD can be used as addition element to improve the hydrogen absorption properties of Ti-Zr-Ni quasicrystal alloys, but the mechanism of PD addition is still unclear. The substitution behavior of PD in Ti45Zr38Ni17 and Ti40Zr40Ni20 alloys was studied by means of DSC. The results show that in the former alloy, the substitution of 4% and 6 (atomic fraction) can ensure the formation of pure icosahedron quasicrystal, and in the latter alloy, the pure icosahedron quasicrystal can be formed by replacing 3%~4%Ti or less than 3% Zr. This indicates that Ti has a higher substitution limit. Two derived quasicrystals, Ti39Zr38Ni17Pd6 and Ti36Zr40Ni20Pd4, can be transformed into crystalline phase after annealing at 400 鈩，

本文编号：1811913