TEM study of Ti50Ni25Cu25 melt spun ribbons
TEM study of Ti50Ni25Cu25 melt spun ribbons
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DOI：
10.1016/s1359-6462(97)00092-4
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发表时间：
1997-08
影响因子：
6
通讯作者：
Z. Xie;J. Humbeeck;Yinong Liu;L. Delaey
中科院分区：
文献类型：
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作者：
Z. Xie;J. Humbeeck;Yinong Liu;L. Delaey
三元合金元素添加到近等原子Ti-Ni形状记忆合金（SMA）中影响相变行为（1）和形状记忆特性（2）。在合金元素中，Cu的影响是独特的。用Cu代替Ni降低了M、温度（3）、相变滞后（4）、马氏体的流动应力（3）、伪弹性的滞后（3，5）的组成敏感性，并且还防止了Ti 3 Nid相（3）的沉淀。不幸的是，发现Cu添加超过10原子%，使合金脆化并严重降低可成形性。因此，需要改进制造工艺，以便导致具有高（> 10 at.%）在20世纪90年代初探索了通过熔融纺丝技术制造Ti-Ni-Cu带（5，6）。结果表明，与传统的Ti-Ni-Cu合金丝相比，快淬薄带具有相变应变大、热能转换能力高等上级特点。（s）。本文研究了两种熔体快淬Ti_（50）Ni_（50）（at.%）用DSC和TEM研究了不同宽度的薄带。
Ternary alloying elements added to a near-equiatomic Ti-Ni shape memory alloy (SMA) affect the transformation behavior (1) and the shape memory characteristics (2). Among the alloying elements, the influence of Cu is unique. Substituting Cu for Ni reduces the composition sensitivity of the M, temperature (3), the transformation hysteresis (4), the flow stress of martensite (3), the hysteresis of the pseudoelasticity (3, 5), and also prevents the precipitation of the Ti3Nid phase (3). Unfortunately, it was found that Cu addition exceeding 10 at.% embrittles the alloy and reduces seriously the formability. Improvement of the fabrication processes is thus needed in order to lead to new applications of the Ti-Ni-Cu SM4s with high (> 10 at.%) copper.Fabrication of Ti-Ni-Cu ribbon by a melt spinning technique was explored in the beginning of 1990’s (5, 6). It was found that the melt spun ribbons have several superior characteristics when compared with thme conventionally produced Ti-Ni-Cu wires, such as a large transformation strain and a higher thermal energy conversion capability, etc..(s). In the present research, the transformation behavior and microstructures of two melt spun TisoNi&uzs (at.%) ribbons with different widths are studied by using DSC and TEM.