激光粉末床熔融对NiTi/Zr复合材料显微组织及性能的调控机制  

Regulatory Mechanism of Laser Powder Bed Fusion on the Microstructure and Properties of NiTi/Zr Composites

作　　者：李晟 唐柳琳 闫星辰 邓朝阳 褚清坤 黄正华 郑李娟[1,2,3] LI Sheng;TANG Liulin;YAN Xingchen;DENG Zhaoyang;CHU Qingkun;HUANG Zhenghua;ZHENG Lijuan(School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou Guangdong 510006,China;State Key Laboratory for High Performance Tools,Guangdong University of Technology,Guangzhou Guangdong 510006,China;Guangdong Provincial Key Laboratory of Minimally Invasive Surgical Instruments and Manufacturing Technology,Guangdong University of Technology,Guangzhou Guangdong 510006,China;Guangdong Provincial Key Laboratory of Modern Surface Engineering Technology,Guangdong-Hong Kong Joint Laboratory of Modern Surface Engineering Technology,Institute of New Materials,Guangdong Academy of Sciences,Guangzhou Guangdong 510651,China;School of Materials and Energy,Guangdong University of Technology,Guangzhou Guangdong 510006,China;Guangdong Hanbang 3D Technology Co.,Ltd.,Zhongshan Guangdong 528427,China)

机构地区：[1]广东工业大学机电工程学院,广东广州510006 [2]广东工业大学高性能工具全国重点实验室,广东广州510006 [3]广东工业大学广东省微创手术器械设计与精密制造重点实验室,广东广州510006 [4]广东省科学院新材料研究所,粤港现代表面工程技术联合实验室,广东省现代表面工程技术重点实验室,广东广州510651 [5]广东工业大学材料与能源学院,广东广州510006 [6]广东汉邦激光科技有限公司,广东中山528427

出　　处：《机床与液压》2025年第4期191-198,共8页Machine Tool & Hydraulics

基　　金：广东省自然科学基金面上项目(2023A1515011584);广东省重点领域研发计划项目(2023B0909020004);广州市基础与应用基础项目(2023A04J1608);中山市重大科技专项(2022A1006);广东工业大学智慧医疗创新技术中心揭榜挂帅项目(26330278206)。

摘　　要：采用激光粉末床熔融增材制造的NiTi形状记忆合金普遍存在延展性低、缺陷多、形状记忆性能调控困难等问题。针对此,通过在近等原子比NiTi合金粉末中加入质量分数为1%的ZrH_(2)粉末,形成NiTi/Zr金属基复合材料,以改善NiTi合金的成形性和力学性能,并通过工艺参数有效调控NiTi合金的相变性能。结果表明:Zr掺杂在合适的成形参数条件下有效抑制了球化现象,从而减少了未熔合缺陷。同时分析了Zr掺杂NiTi形状记忆复合材料的显微组织。结果表明:激光工艺参数能够改变Zr在NiTi基体中的状态,形成Zr单质、固溶体、析出相等不同显微组织。示差扫描量热仪和拉伸实验表明:Zr掺杂结合不同的工艺参数能够实现形状记忆性能调控,并在不显著改变弹性模量的前提下同时提高材料的抗拉强度和断裂韧性。NiTi shape memory alloys manufactured by laser powder bed fusion have many problems,such as low ductility,many defects and difficult shape memory performance control.In view of this,by adding ZrH_(2)nanoparticle with a mass fraction of 1%to NiTi alloy powder,NiTi/Zr metal matrix composite was formed to improve the formability and mechanical properties of NiTi alloy,and the phase transformation properties of NiTi alloy were effectively regulated by the process parameters.The results show that Zr addition effectively inhibits spheroidization phenomenon under suitable forming parameters,thus reducing unfused defects.The microstructure of NiTi shape memory composite with Zr addition was also analyzed.The results show that the laser process parameters can change the formation of Zr in NiTi matrix,and the microstructure of Zr elemental,solid solution and precipitated phase are formed.Differential scanning calorimeter and tensile experiments show that Zr addition combined with different process parameters can achieve shape memory performance regulation,and improve the tensile strength and fracture toughness of the material without significantly changing the elastic modulus.

关 键 词：激光粉末床熔融 NiTi/Zr金属基复合材料 力学性能 显微组织 

分 类 号：TB331[一般工业技术—材料科学与工程]