激光扫描速度对4D打印钛镍形状记忆合金相转变和超弹性的影响

doi:10.3901/JME.2020.15.065

机械工程学报 ›› 2020, Vol. 56 ›› Issue (15): 65-71.doi: 10.3901/JME.2020.15.065

• 特邀专栏：4D打印技术 • 上一篇下一篇

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激光扫描速度对4D打印钛镍形状记忆合金相转变和超弹性的影响

卢海洲¹, 马宏伟¹, 罗炫¹, 杨超¹, 李元元^1,2

1. 华南理工大学国家金属材料近净成形工程技术研究中心广州 510640;
2. 华中科技大学材料科学与工程学院武汉 430074

收稿日期:2019-09-14 修回日期:2019-12-28 出版日期:2020-08-05 发布日期:2020-10-19
通讯作者: 杨超(通信作者),男,1977年出生,博士,教授,博士研究生导师。主要研究方向为金属新材料的制备与成形。E-mail:cyang@scut.edu.cn
作者简介:卢海洲,男,1993年出生,博士研究生。主要研究方向为4D打印钛镍合金。E-mail:mehzlu@mail.scut.edu.cn
基金资助:
中央军委科技委创新特区、国家自然科学基金面上（51574128）和国家自然科学基金重大科研仪器研制（51627805）资助项目。

Influence of Laser Scanning Speed on Phase Transformation and Superelasticity of 4D-printed Ti-Ni Shape Memory Alloys

LU Haizhou¹, MA Hongwei¹, LUO Xuan¹, YANG Chao¹, LI Yuanyuan^1,2

1. National Engineering Research Center of Near-net-shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640;
2. School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074

Received:2019-09-14 Revised:2019-12-28 Online:2020-08-05 Published:2020-10-19

摘要/Abstract

摘要： 通过调控激光扫描速度，运用4D打印技术制备出具有不同相转变温度和微观结构的钛镍形状记忆合金。结合XRD、DSC、SEM和循环压缩等分析方法研究了不同扫描速度对4D打印钛镍合金相组成、相转变、微观结构和超弹性的影响。结果表明，当激光扫描速度从80 mm/s到150 mm/s时，4D打印钛镍合金中马氏体相（B19'）含量减少，奥氏体相（B2）含量增加；马氏体转变开始温度（M_s）和奥氏体转变结束温度（A_f）随激光扫描速度增加而降低。奥氏体状态下循环压缩试验结果表明：激光扫描速度为80 mm/s时，4D打印钛镍合金具有良好的超弹性，10次循环压缩后稳定的可回复应变达到4.99%，高于目前文献报道的回复应变2.64%；激光扫描速度为150 mm/s时，在3次循环压缩后回复应变几乎保持在4.55%不变。

关键词: 4D打印, 形状记忆合金, 相转变, 超弹性, 微观结构

Abstract: By adjusting laser scanning speed during 4D printing, Ti-Ni shape memory alloys (SMAs) with different phase transformation temperatures and microstructures are manufactured. The influences of laser scanning speed on phase component, phase transformation temperature, microstructure and superelasticity of 4D-printed Ti-Ni SMAs are analyzed by various methods of XRD, DSC, SEM and cyclic compression experiment. The results show that the volume fraction of martensite (B19’) in 4D-printed TiNi SMAs decreases together with the gradually increased volume fraction of austenite (B2) when the laser scanning speed increases from 80 mm/s to 150 mm/s. Meanwhile, the martensite transformation start temperature (M_s) and the austenite transformation finish temperature (A_f) decrease with the increase of laser scanning speed. At the laser scanning speed of 80 mm/s, the cyclic compression experiments under austenite state (B2) show that the 4D-printed Ti-Ni SMAs have good superelasticity, exhibiting the stable recovery strain of 4.99% after ten times cyclic compression. It’s much higher than the recovery strain of 2.64%, which have been reported. With the increased laser scanning speed to 150 mm/s, the recovery strain remains at 4.55% after three cycle compressions.

Key words: 4D printing, shape memory alloy, phase transformation, superelasticity, microstructure

中图分类号:

TF124

卢海洲, 马宏伟, 罗炫, 杨超, 李元元. 激光扫描速度对4D打印钛镍形状记忆合金相转变和超弹性的影响[J]. 机械工程学报, 2020, 56(15): 65-71.

LU Haizhou, MA Hongwei, LUO Xuan, YANG Chao, LI Yuanyuan. Influence of Laser Scanning Speed on Phase Transformation and Superelasticity of 4D-printed Ti-Ni Shape Memory Alloys[J]. Journal of Mechanical Engineering, 2020, 56(15): 65-71.

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激光扫描速度对4D打印钛镍形状记忆合金相转变和超弹性的影响

Influence of Laser Scanning Speed on Phase Transformation and Superelasticity of 4D-printed Ti-Ni Shape Memory Alloys

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