Microstructure and Mechanical Properties of NiTi Alloy Prepared by Double-Wire + Arc Additive Manufacturing Plus In Situ Heat Treatment.

IF 4.7 Q2 MATERIALS SCIENCE, BIOMATERIALS ACS Applied Bio Materials Pub Date : 2024-06-18 eCollection Date: 2024-06-01 DOI:10.1089/3dp.2023.0003

Jian Han, Xinya Chen, Guoyang Zhang, Bang Liu, Meiqing Meng, Yangchuan Cai, Hongbing Jiang, Mingjie Bi, Yueqian Hong, Yinbao Tian

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Abstract

In this study, NiTi shape memory alloy was prepared by double-wire + arc additive manufacturing plus in situ heat treatment using TA1 and ER-Ni welding wires as the raw materials. The results show that the microstructural evolution from the bottom to top is NiTi₂ + NiTi → NiTi + Ni₃Ti + Ni₄Ti₃ → NiTi + Ni₄Ti₃ + Ni₃Ti₂ + Ni₃Ti + α-Ti. Complex thermal cycles led to the precipitation of Ni₃Ti, which improves the hardness of the matrix (B2), and the average hardness value of the top region reaches 550.7 HV_0.2. The fracture stress is 2075 ± 138.4 MPa and the fracture strain is 11.2 ± 1.27%. The sample shows 7.02% residual strain and 5.87% reversible strain after 15 cycles, and the stress hysteresis decreases with an increase in cyclic strain.

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双丝+电弧增材+原位热处理制备NiTi合金的组织与力学性能

本研究以 TA1 和 ER-Ni 焊丝为原料，采用双丝+电弧快速成型加原位热处理的方法制备了 NiTi 形状记忆合金。结果表明，从下到上的微观结构演变为 NiTi2 + NiTi → NiTi + Ni3Ti + Ni4Ti3 → NiTi + Ni4Ti3 + Ni3Ti2 + Ni3Ti + α-Ti。复杂的热循环导致了 Ni3Ti 的析出，从而提高了基体（B2）的硬度，顶部区域的平均硬度值达到了 550.7 HV0.2。断裂应力为 2075 ± 138.4 MPa，断裂应变为 11.2 ± 1.27%。样品在循环 15 次后显示出 7.02% 的残余应变和 5.87% 的可逆应变，应力滞后随循环应变的增加而减小。

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来源期刊

ACS Applied Bio Materials Chemistry-Chemistry (all)

CiteScore

9.40

自引率

2.10%

发文量

464

期刊介绍： ACS Applied Bio Materials is an interdisciplinary journal publishing original research covering all aspects of biomaterials and biointerfaces including and beyond the traditional biosensing, biomedical and therapeutic applications. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important bio applications. The journal is specifically interested in work that addresses the relationship between structure and function and assesses the stability and degradation of materials under relevant environmental and biological conditions.