激光选区熔化成形CuZnAl形状记忆合金工艺研究

doi:10.3901/JME.2019.15.024

机械工程学报 ›› 2019, Vol. 55 ›› Issue (15): 24-30.doi: 10.3901/JME.2019.15.024

• 特邀专栏：增材制造技术 • 上一篇下一篇

激光选区熔化成形CuZnAl形状记忆合金工艺研究

卓林蓉, 宋波, 章媛洁, 王敏, 魏青松, 史玉升

华中科技大学材料成形与模具技术国家重点实验室武汉 430074

收稿日期:2018-12-07 修回日期:2019-02-01 出版日期:2019-08-05 发布日期:2019-08-05
通讯作者: 宋波(通信作者),男,1984年出生,博士,副教授,博士研究生导师。主要研究方向为3D打印技术,粉末冶金,材料与结构设计。E-mail:bosong@hust.edu.cn
作者简介:卓林蓉,女,1995年出生。主要研究方向为形状记忆合金增材制造。E-mail:m201770858@hust.edu.cn
基金资助:
湖北省杰出青年科学基金（0216110085）和武汉市晨光计划（0216110066）资助项目。

Study on CuZnAl Memory Alloy Fbricated by Selective Laser Melting

ZHUO Linrong, SONG Bo, ZHANG Yuanjie, WANG Min, WEI Qingsong, SHI Yusheng

State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074

Received:2018-12-07 Revised:2019-02-01 Online:2019-08-05 Published:2019-08-05

摘要/Abstract

摘要： 利用激光选区熔化技术制备了铜基形状记忆合金块体，并初步探索了不同激光体能量密度对于合金致密度、相组成、微观组织形貌及力学性能的影响。发现随着激光体能量密度的增加，致密度先增加后减少。试样中β相的含量随着激光体能量密度的增加而减少，当激光体能量密度达到194.4 J/mm³时，β相完全消失，只剩下单一的α相。显微组织观察显示，采用激光选区熔化技术制备的块体中存在的α相呈现规则的层片状，不同于铸造组织中形成的长条状α相。受到孔隙率的影响，拉伸强度随着激光体能量密度的增加而增加，最高拉伸强度可达328.3 MPa；而由于相组成的改变，显微硬度随着激光体能量密度的增加而降低。

关键词: 多目标优化, 低能耗, 切削参数, 少切削液, 数控加工, Cu-Zn-Al形状记忆合金, 工艺参数, 激光选区熔化技术

Abstract: Copper based shape memory alloy was fabricated by selective laser melting successfully. The relative density, phase composition, microstructure and mechanical properties of samples with different energy density were investigated. The results shows that with the increase of energy density, relative density increases first and then decreases. The content of β phase decreases with the increase of the energy density. When energy density reaches 194.4 J/mm³, β phase disappears and there is only a phase left. Microstructure observation shows that there is lamellar α phase in the bulk fabricated by selective laser melting, which different from the short rod like α phase formed in the casting bulk. Tensile strength increases with the increase of energy density because of the decreased porosity. The maximum tensile strength can reach 328.3 MPa. While the microhardness decreases with the increase of energy density due to the change of phase composition.

Key words: Cutting parameters, Low Energy, Minimum Cutting Fluid, Multi-objective optimization, NC Machining, Cu-Zn-Al shape memory alloy, process parameter, selective laser melting

中图分类号:

TG139

卓林蓉, 宋波, 章媛洁, 王敏, 魏青松, 史玉升. 激光选区熔化成形CuZnAl形状记忆合金工艺研究[J]. 机械工程学报, 2019, 55(15): 24-30.

ZHUO Linrong, SONG Bo, ZHANG Yuanjie, WANG Min, WEI Qingsong, SHI Yusheng. Study on CuZnAl Memory Alloy Fbricated by Selective Laser Melting[J]. Journal of Mechanical Engineering, 2019, 55(15): 24-30.

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激光选区熔化成形CuZnAl形状记忆合金工艺研究

Study on CuZnAl Memory Alloy Fbricated by Selective Laser Melting

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