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首页> 外文期刊>Materials Science and Engineering >Effects of Nb addition on microstructure and mechanical properties of TiNiNb alloys fabricated by elemental powder sintering
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Effects of Nb addition on microstructure and mechanical properties of TiNiNb alloys fabricated by elemental powder sintering

机译：Nb添加对元素粉末烧结TiNiNb合金组织和力学性能的影响

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摘要

Porous TiNi binary and TiNiNb ternary alloys of four compositions (Ti_(50)Ni_(47.5)Nb_(2.5), Ti_(50)Ni_(45)Nb_5, Ti_(50)Ni_(42.5)Nb_(7.5), and Ti_(50)Ni_(40)Nb_(10)) were fabricated by the elemental powder sintering process. The effects of Nb addition on microstructure and mechanical properties of TiNi(Nb) alloys were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and tensile tests, respectively. With the increase of Nb contents, the TiNi matrix as the main phase is always retained, while the intensity of its diffraction peak gradually became weak with the appearance of P-Nb and TiNb phases. Most Nb particles are well-distributed in the TiNi matrix and (Ti,Nb)_2Ni phase is found in the binding domain between Nb phase and TiNi phase. The tensile strength and elastic modulus of TiNiNb alloys increase with the increase of Nb contents, due to the solid solution strengthening effect of Nb-rich particles, the enlarged sintering neck and the strengthened bond between particles. Consequently, Nb plays a crucial role in adjusting composition and improving microstructure and mechanical properties of TiNiNb alloys.
机译：四种成分的多孔TiNi二元和TiNiNb三元合金（Ti_（50）Ni_（47.5）Nb_（2.5），Ti_（50）Ni_（45）Nb_5，Ti_（50）Ni_（42.5）Nb_（7.5）和Ti_（通过元素粉末烧结工艺制备了50）Ni_（40）Nb_（10））。分别通过X射线衍射（XRD），扫描电子显微镜（SEM）和拉伸试验研究了添加铌对TiNi（Nb）合金组织和力学性能的影响。随着Nb含量的增加，TiNi基体作为主相始终被保留，而其衍射峰的强度随着P-Nb和TiNb相的出现逐渐变弱。大多数Nb颗粒均分布在TiNi基体中，并且在Nb相与TiNi相之间的结合域中发现（Ti，Nb）_2Ni相。 TiNiNb合金的拉伸强度和弹性模量随着Nb含量的增加而增加，这归因于富Nb颗粒的固溶强化作用，增大的烧结颈和增强的颗粒间结合。因此，Nb在调节TiNiNb合金的成分以及改善其微观结构和力学性能方面起着至关重要的作用。

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