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首页> 外文期刊>Journal of Materials Engineering and Performance >Properties of Porous TiNbZr Shape Memory Alloy Fabricated by Mechanical Alloying and Hot Isostatic Pressing
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Properties of Porous TiNbZr Shape Memory Alloy Fabricated by Mechanical Alloying and Hot Isostatic Pressing

机译：机械合金化和热等静压制备的多孔TiNbZr形状记忆合金的性能

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摘要

In the past decades, systematic researches have been focused on studying Ti-Nb-based SMAs by adding ternary elements, such as Mo, Sn, Zr, etc. However, only arc melting or induction melting methods, with subsequent hot or cold rolling, were used to fabricate these Ni-free SMAs. There is no work related to powder metallurgy and porous structures. This study focuses on the fabrication and characterization of porous Ti-22Nb-6Zr (at.%) shape memory alloys produced using elemental powders by means of mechanical alloying and hot isostatic pressing. It is found that the porous Ti-22Nb-6Zr alloys prepared by the HIP process exhibit a homogenous pore distribution with spherical pores, while the pores have irregular shape in the specimen prepared by conventional sintering. X-ray diffraction analysis showed that the solid solution-treated Ti-22Nb-6Zr alloy consists of both β phase and α" martensite phase. Morphologies of martensite were observed. Finally, the porous Ti-22Nb-6Zr SMAs produced by both MA and HIP exhibit good mechanical properties, such as superior superelasticity, with maximum recoverable strain of ～3% and high compressive strength.
机译：在过去的几十年中，系统研究集中在通过添加三元元素（例如Mo，Sn，Zr等）来研究基于Ti-Nb的SMA。但是，只有电弧熔化或感应熔化方法，随后进行热轧或冷轧，用于制造这些无镍SMA。没有涉及粉末冶金和多孔结构的工作。这项研究的重点是通过机械合金化和热等静压的方法，利用元素粉末生产的多孔Ti-22Nb-6Zr（原子％）形状记忆合金的制备和表征。发现通过HIP方法制备的多孔Ti-22Nb-6Zr合金表现出具有球形孔的均匀孔分布，而通过常规烧结制备的样品中孔具有不规则形状。 X射线衍射分析表明，固溶处理的Ti-22Nb-6Zr合金由β相和α“马氏体相组成。观察到马氏体的形貌。 HIP具有良好的机械性能，例如优异的超弹性，最大可恢复应变约3％和高抗压强度。

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