NiTiNb shape memory alloys fabricated via the reactive sintering of elemental powders: Microstructures, transformation behaviors and compressive properties
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引用次数: 0
Abstract
Elemental powder sintering is an important low-cost preparation method for NiTiNb shape memory alloys. Usually, the performance is poor due to high impurity content and macroscopic defects. In this study, high-strength NiTiNb alloys without macroscopic defects were successfully prepared using mixed elemental powders based on the previous investigation. Higher sintering temperature and Nb addition brought about faster atomic diffusion, which strongly affected the densification, grain size, phase composition and Nb solid solution, and further determined the transformation temperature and mechanical properties. The transformation temperature decreased with increasing Nb solid solubility. A high thermal hysteresis of 72–75 °C was obtained by nano-Nb precipitation. The compressive strength reached 1662–2185 MPa. The recovery properties gradually decreased with the increase of large Nb particles in the matrix, which should be optimized in further studies. Overall, the addition of Nb drastically reduced the sintering temperature of elemental NiTi powders, which was conducive to suppressing the loss of liquid phase and promoting homogenization. It provides a new idea for the preparation of high-performance, fully dense and low-cost NiTi-based alloys.
元素粉末烧结是镍钛铌形状记忆合金的一种重要的低成本制备方法。通常,由于杂质含量高和存在宏观缺陷,其性能较差。本研究在前人研究的基础上,采用混合元素粉末成功制备了无宏观缺陷的高强度镍钛铌合金。较高的烧结温度和 Nb 添加量带来了更快的原子扩散,对致密化、晶粒尺寸、相组成和 Nb 固溶体产生了强烈影响,并进一步决定了转变温度和力学性能。转变温度随着铌固溶度的增加而降低。纳米铌沉淀获得了 72-75 °C 的高热滞后。抗压强度达到 1662-2185 兆帕。随着基体中大铌颗粒的增加,恢复性能逐渐降低,这需要在进一步研究中加以优化。总之,Nb的加入大大降低了元素镍钛粉末的烧结温度,有利于抑制液相损失和促进均匀化。这为制备高性能、全致密、低成本的镍钛基合金提供了新思路。
期刊介绍:
Materials and Design is a multi-disciplinary journal that publishes original research reports, review articles, and express communications. The journal focuses on studying the structure and properties of inorganic and organic materials, advancements in synthesis, processing, characterization, and testing, the design of materials and engineering systems, and their applications in technology. It aims to bring together various aspects of materials science, engineering, physics, and chemistry.
The journal explores themes ranging from materials to design and aims to reveal the connections between natural and artificial materials, as well as experiment and modeling. Manuscripts submitted to Materials and Design should contain elements of discovery and surprise, as they often contribute new insights into the architecture and function of matter.