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首页> 外文期刊>Journal of Materials Engineering and Performance >Phase Transformation Behavior of Hot Isostatically Pressed NiTi-X (X = Ag, Nb, W) Alloys for Functional Engineering Applications
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Phase Transformation Behavior of Hot Isostatically Pressed NiTi-X (X = Ag, Nb, W) Alloys for Functional Engineering Applications

机译：功能工程应用的热等静压NiTi-X（X = Ag，Nb，W）合金的相变行为

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摘要

Owing to their unique properties, NiTi-based shape memory alloys (SMAs) are highly attractive candidates for a lot of functional engineering applications like biomedical implants (stents), actuators, or coupling elements. Adding a third element is an effective measure to adjust or stabilize the phase transformation behavior to a certain extent. In this context, addition of alloying elements, which are low soluble or almost insoluble in the NiTi matrix is a promising approach and - with the exception of adding Nb - has rarely been reported in the literature so far, especially if the manufacturing of the net-shaped parts of these alloys is aspired. In the case of addition of elemental Nb, broadening of hysteresis between austenitic and martensitic phase transformation temperatures after plastic deformation of the Nb phase is a well-known effect, which is the key of function of coupling elements already established on the market. In the present study, we replaced Nb with additions of elemental Ag and W, both of which are almost insoluble in the NiTi matrix. Compared with Nb, Ag is characterized by higher ductility in combination with lower melting point, enabling liquid phase sintering already at moderate temperatures. Vice versa, addition of W might act in opposite manner considering its inherent brittleness combined with high melting temperature. In the present study, hot isostatic pressing was used for manufacturing such alloys starting from prealloyed NiTi powder and with the additions of Nb, Ag, and W as elemental powders. Microstructures, interdiffusion phenomena, phase transformation behaviors, and impurity contents were investigated aiming to better understand the influence of insoluble phases on bulk properties of NiTi SMAs.
机译：由于其独特的性能，基于NiTi的形状记忆合金（SMA）是许多功能工程应用（例如生物医学植入物（支架），致动器或耦合元件）的极具吸引力的候选材料。添加第三元素是在一定程度上调节或稳定相变行为的有效措施。在这种情况下，添加低溶解度或几乎不溶解于NiTi基体的合金元素是一种有前途的方法，而且到目前为止，除了添加Nb以外，几乎没有文献报道，特别是在制造金属网时。吸入这些合金的异形零件。在添加元素Nb的情况下，Nb相塑性变形后奥氏体和马氏体相变温度之间的滞后变宽是众所周知的效果，这是市场上已经建立的耦合元素的功能关键。在本研究中，我们用元素Ag和W代替了Nb，这两种元素都几乎不溶于NiTi基体中。与Nb相比，Ag具有更高的延展性和更低的熔点，能够在中等温度下进行液相烧结。反之亦然，考虑到其固有的脆性和较高的熔化温度，W的添加可能以相反的方式起作用。在本研究中，热等静压用于从预合金化的NiTi粉末开始制造合金，并添加Nb，Ag和W作为元素粉末。为了更好地理解不溶相对NiTi SMAs整体性能的影响，研究了微结构，互扩散现象，相变行为和杂质含量。

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