Pd替代对Ti-Zr-Ni准晶合金中的相形成与稳定性影响（英文）  

Effect of Pd Substitution on Phase Formation and Stability in Ti-Zr-Ni Quasicrystalline Alloys

作　　者：黄火根[1] 陈亮[1] 徐钦英[2] 

机构地区：[1]中国工程物理研究院,四川绵阳621900 [2]表面物理与化学重点实验室,四川绵阳621907

出　　处：《稀有金属材料与工程》2015年第4期821-825,共5页Rare Metal Materials and Engineering

基　　金：Foundation of Science and Technology on Surface Physics and Chemistry Laboratory

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。Pd can be used as an adding element to improve hydrogenation properties of Ti-Zr-Ni quasicrystalline alloys. However, the action mechanism of Pd addition is unclear yet. The effects of Pd substituting Ti and Zr in TigsZr38Ni17 and Ti40Zr4oNi20 alloys were studied by means of XRD, TEM and DSC examination. The results show that icosahedral quasicrystal can be formed purely through 4%-6% Pd substitution for Ti or 4% for Zr in the Ti45Zr38Ni17 alloy, as well as 3%-4% for Ti or possibly below 3% for Zr in the Ti40Zr40Ni20 alloy. This indicates a higher substitution limit for Ti in order for the heritance of the quasicrystal phase. Two derived quasicrystals Ti39Zr38Ni17Pd6 and Ti36Zr4oNi2oPch can be transformed into crystalline phases after annealing at 400 ℃, demonstrating their lower thermo-stabilities in comparison to such Ti-Zr-Ni alloys being stable at about 700 ℃. Both the replacement tendency and the decrease of the thermostability of quasicrystal phase might be ascribed to appropriate atomic size of Pd.

关 键 词：准晶 Ti-Zr-Ni合金 钯 相稳定性 

分 类 号：TG146.23[一般工业技术—材料科学与工程]