原位激光定向能量沉积<strong>NiTi</strong>形状记忆合金的微观结构和力学性能

doi:10.11900/0412.1961.2022.00425

金属学报

2023, Vol. 59

Issue (1): 180-190 DOI: 10.11900/0412.1961.2022.00425

研究论文

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原位激光定向能量沉积NiTi形状记忆合金的微观结构和力学性能

陈斐¹^,²^,³(

), 邱鹏程¹, 刘洋¹^,², 孙兵兵⁴, 赵海生⁴, 沈强¹

1.武汉理工大学材料复合新技术国家重点实验室武汉 430070
2.武汉理工大学材料科学与工程国际化示范学院(材料与微电子学院) 武汉 430070
3 湖北隆中实验室襄阳 441000
4 航发优材(镇江)增材制造有限公司镇江 212132

Microstructure and Mechanical Properties of NiTi Shape Memory Alloys by In Situ Laser Directed Energy Deposition

CHEN Fei¹^,²^,³(

), QIU Pengcheng¹, LIU Yang¹^,², SUN Bingbing⁴, ZHAO Haisheng⁴, SHEN Qiang¹

1.State Key Laboratory of Advance e Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
2.International School of Materials Science and Engineering (School of Materials and Microelectronics), Wuhan University of Technology, Wuhan 430070, China
3 Hubei Longzhong Laboratory, Xiangyang 441000, China
4 HFYC (Zhenjiang) Additive Manufacturing Co., Ltd., Zhenjiang 212132, China

引用本文:

陈斐, 邱鹏程, 刘洋, 孙兵兵, 赵海生, 沈强. 原位激光定向能量沉积NiTi形状记忆合金的微观结构和力学性能[J]. 金属学报, 2023, 59(1): 180-190.
Fei CHEN, Pengcheng QIU, Yang LIU, Bingbing SUN, Haisheng ZHAO, Qiang SHEN. Microstructure and Mechanical Properties of NiTi Shape Memory Alloys by In Situ Laser Directed Energy Deposition[J]. Acta Metall Sin, 2023, 59(1): 180-190.

全文: PDF(2852 KB) HTML

摘要:

以Ni粉与Ti粉为原料，采用激光定向能量沉积(LDED)技术制备NiTi形状记忆合金。利用XRD、物相拟合、SEM、EDS和DSC等测试方法，对NiTi合金的显微组织、物相含量和物相转变进行分析，随后采用压缩圆柱样品进行形状记忆效应测试，并评估其形状记忆效应。激光能量密度较低时，NiTi合金中产生大量Ni₄Ti₃相沉淀，随着激光能量密度增加，Ni₄Ti₃相消失。激光能量密度为20.0 J/mm²时，NiTi合金具有2878 MPa的压缩断裂强度与34.9%的压缩失效应变，且样品在循环20 cyc后具有88.2%形状记忆恢复率。

关键词 ：激光定向能量沉积, 激光原位合成, NiTi形状记忆合金, 形状记忆效应

Abstract：

The NiTi alloy is a key material in aerospace and biomedical fields owing to its excellent superelasticity and high shape memory effect. Laser directed energy deposition (LDED), as an advanced additive manufacturing technology, made the preparation of NiTi alloys with high shape memory effect possible. In this study, the NiTi alloy was fabricated via LDED using Ni and Ti powder feedstock. The microstructure, phase content, and phase transformation of the alloy were analyzed by XRD, phase fitting, SEM, EDS, and DSC. Next, the shape memory effect was tested using compressed cylindrical samples. When the laser energy density was low, several Ni₄Ti₃ phases were produced in the NiTi alloy. The Ni₄Ti₃ phase disappeared with an increase in the laser energy density. When the laser energy density was 20.0 J/mm², the NiTi alloy showed a high compressive breaking strength of 2878 MPa and a compression failure strain of 34.9%, and the sample also showed a shape recovery rate of 88.2% after 20 cyc of compression.

Key words： laser directed energy deposition laser in situ synthesis NiTi shape memory alloy shape memory effect

收稿日期: 2022-08-31

ZTFLH:

TG139.6

基金资助:国家自然科学基金项目(51972246);广东省重大基础与应用基础研究项目(2021B0301030001);湖北隆中实验室自主创新研究项目(2022ZZ-32)

作者简介: 邱鹏程，男，1996年生，硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2022.00425 或 https://www.ams.org.cn/CN/Y2023/V59/I1/180

表1 球形Ni粉和Ti粉的化学成分 (mass fraction / %)

图1 粉末颗粒的尺寸分布和形貌

图2 不同激光能量密度下NiTi合金的XRD谱及其物相拟合结果

图3 NiTi合金中B19?、B2和NiTi2相含量随激光能量密度的变化

图4 不同激光能量密度下NiTi合金的致密度及其x-z面形貌像

图5 不同激光能量密度下NiTi合金的SEM像

表2 不同激光能量密度下NiTi合金的EDS分析结果

图6 不同激光能量密度下NiTi合金的TEM像和选区电子衍射花样

图7 不同激光能量密度下NiTi合金的DSC曲线

表3 不同激光能量密度下NiTi合金相变温度 (oC)

图8 不同激光能量密度下NiTi合金的压缩应力-应变曲线

表4 不同激光能量密度下NiTi合金常温压缩性能

图9 不同激光能量密度下NiTi合金20 cyc循环压缩应力-应变曲线

表5 不同激光能量密度下NiTi合金20 cyc循环压缩的形状记忆效应 (%)

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