Alloys Design of PdTi-Based Shape Memory Alloys Based on Defect Structures and Site Preference of Ternary Elements
Alloys Design of PdTi-Based Shape Memory Alloys Based on Defect Structures and Site Preference of Ternary Elements
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基于缺陷结构和三元元素位点偏好的PdTi基形状记忆合金的合金设计
DOI：
10.1177/1045389x9600700312
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发表时间：
1996
影响因子：
2.7
通讯作者：
K. Inoue
中科院分区：
文献类型：
--
作者：
H. Hosoda;K. Enami;A. Kamio;K. Inoue
为了设计基于PdTi的智能材料，利用伪基态分析（或接近零开尔文的分析）对b2型PdTi合金中三元元素的缺陷结构和位置偏好进行了评估。结果表明，无论合金成分如何，这种分析方法都可以预测合金中缺陷的结构类型，即反结构（取代）型缺陷。预测的取代行为如下：(1)大部分1A ~ 5A族元素仅占据Ti位点；(2) 6A ~ 8A族的大部分元素仅占据Pd位点；(3)当这些位点未被相应的组成元素（Pd或Ti）填充时，所研究的其他位点占据其中任何一个位点。此外，还以电子原子比（e/a）为函数，评价了化学计量学和三维跃迁元素添加量对PdTi合金马氏体相变起始温度（MS）的影响。研究发现，当考虑三元加成的三维电子时，M与e/a值密切相关，尽管e/a对M的影响随着它们的取代行为的不同而不同。当添加pd位点取代元素（如Cr、Mn、Fe、Co和Ni）时，每e/a M的变化估计为900 K，而当添加ti位点取代元素（如V）时，每e/a M的变化为790 K。这表明M不仅受e/a值的影响，还受原子构型的影响。
Defect structures and site preference of ternary elements in B2-type PdTi alloys are evaluated in order to design PdTi-based smart materials using the pseudo-ground state analysis (or analysis performed at near zero Kelvin). It has been found that this analysis can predict types of defect structures in these alloys which are of antistructure (substitution) type regardless of alloy compositions. Substitution behavior predicted is as follows: (1) most elements belonging to groups 1A through 5A occupy Ti sites only; (2) most elements belonging to groups 6A through 8A occupy Pd sites only; and (3) the others studied occupy either sites when these sites are unfilled with the corresponding constituent elements (Pd or Ti). Moreover, effects of both offstoichiometry and 3dtransition elemental additions on martensitic transformation start temperature (MS) in PdTi alloys are evaluated as a function of electron-atom ratio (e/a). It has been found that M, is strongly related to the e/a value when 3d electrons of ternary additions are taken into account, although the effect of e/a on M, differs if their substitution behavior is different. Changes in M, per e/a are estimated to be 900 K when Pd-site substitution elements, such as Cr, Mn, Fe, Co, and Ni are added, while changes in M, per e/a are 790 K when Ti-site substitution elements such as V are added. This suggests that M, is influenced not only by the e/a value but also by atomic configurations.