Al、Ti元素含量对激光熔化沉积技术制备的FeCrNi(AlTi)x中熵合金组织性能的影响  

Influence of Al and Ti Element Content on the Microstructure and Performance of FeCrNi(AlTi)x Medium-entropy Alloys Prepared by Laser Melting Deposition

作　　者：王凯 刘铭杰 刘川 丁宗业 黎小辉 张立平 陈超 周功胜 Wang Kai;Liu Mingjie;Liu Chuan;Ding Zongye;Li Xiaohui;Zhang Liping;Chen Chao;Zhou Gongsheng(Guangdong Provincial Key Laboratory of Industrial Intelligent Inspection Technology,School of Mechatronic Engineering and Automation,Foshan University,Foshan,Guangdong 528225,China;Guangdong Additive and Subtractive Material Technology Co.,Ltd.,Foshan,Guangdong 528000,China)

机构地区：[1]佛山大学机电工程与自动化学院,广东省工业智能检测技术重点实验室,广东佛山528225 [2]广东增减材科技有限公司,广东佛山528000

出　　处：《机电工程技术》2025年第4期38-45,共8页Mechanical & Electrical Engineering Technology

基　　金：广东省基础与应用基础研究基金(2022A1515010761,2022A0505050081,2022A1515140028,2023A1515140124);广东省高校现代陶瓷与铝型材装备重点实验室(2017KSYS012);粤自然资合[2024]32号。

摘　　要：为提高FeCrNi体系中熵合金的力学性能和耐腐蚀性能,采用激光熔化沉积技术作为制备方法,研究不同Al、Ti元素含量对FeCrNi(AlTi)_(x)(x=0.17、0.24)中熵合金的组织结构、力学性能及耐腐蚀性能的影响。结果表明:Al、Ti元素的添加将改变合金相结构组成,并且Al、Ti含量更高的FeCrNi(AlTi)_(0.24)形成的FCC、BCC双相结构中BCC相体积分数更高;且合金的硬度与抗拉强度随着Al、Ti元素含量的增加有所提升,分别由392.4 HV和656.39 MPa提高到了507.1 HV和919.73 MPa,但合金塑性也因固溶强化作用和BCC相含量的增加而减小;在质量分数3.5%的NaCl溶液中,Al、Ti含量的增加,能够有效提高FeCrNi(AlTi)_(x)中熵合金表面钝化膜的保护性,有效抑制了合金表面点蚀的发生,从而提高了合金的耐腐蚀性能。在一定范围内,提高Al、Ti元素在FeCrNi(AlTi)_(x)体系中含量,能够提升合金的力学性能及耐腐蚀性能。In order to improve the mechanical properties and corrosion resistance of entropy alloy in FeCrNi system,the effects of different contents of Al and Ti elements on the microstructure,mechanical properties and corrosion resistance of entropy alloy in FeCrNi(AlTi)_(x)(x=0.17,0.24)are studied by laser melting deposition technique.The results show that the addition of Al and Ti elements will change the phase structure of the alloy,and the volume fraction of BCC phase formed by FeCrNi(AlTi)_(0.24) with higher content of Al and Ti is higher.The hardness and tensile strength of the alloy increased from 392.4 HV and 656.39 MPa to 507.1 HV and 919.73 MPa with the increase of the content of Al and Ti elements,but the plasticity of the alloy also decreased due to the increase of solid solution strengthening and BCC phase content.In 3.5 wt%NaCl solution,the increase of Al and Ti content can effectively improve the protection of passivation film on the surface of FeCrNi(AlTi)_(x) entropy alloy,effectively inhibit the occurrence of pitting on the alloy surface,and thus improve the corrosion resistance of the alloy.In a certain range,increasing the content of Al and Ti elements in FeCrNi(AlTi)_(x) system can improve the mechanical properties and corrosion resistance of the alloy.

关 键 词：中熵合金 激光熔化沉积 微观组织 力学性能 耐腐蚀性 

分 类 号：TG146.2[一般工业技术—材料科学与工程]