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
收稿日期: 2022-08-31
修回日期: 2022-11-07
网络出版日期: 2022-11-14
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)
Microstructure and Mechanical Properties of NiTi Shape Memory Alloys by In Situ Laser Directed Energy Deposition
Received date: 2022-08-31
Revised date: 2022-11-07
Online published: 2022-11-14
Supported by
National Natural Science Foundation of China(51972246);Guangdong Major Project of Basic and Applied Basic Research(2021B0301030001);Independent Innovation Projects of the Hubei Longzhong Laboratory(2022ZZ-32)
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
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 . DOI: 10.11900/0412.1961.2022.00425
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.
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