Nb对选区激光熔化Zr基非晶合金组织及力学性能的影响  

Effect of Nb on the Microstructure and Mechanical Properties of Zr-based Metallic Glass Prepared by Selective Laser Melting

作　　者：畅泽欣 毕文浩 葛亚琼[1] 宋月 王文先[2] CHANG Zexin;BI Wenhao;GE Yaqiong;SONG Yue;WANG Wenxian(Taiyuan University of Science and Technology,Taiyuan 030024,China;Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原科技大学,太原030024 [2]太原理工大学,太原030024

出　　处：《表面技术》2025年第7期139-150,共12页Surface Technology

基　　金：国家自然科学基金面上项目(52274390);国家留学基金项目(202108140077);山西省回国留学人员科研项目(2021-139);山西省基础研究计划(202103021223297,202103021224266);来晋工作优秀博士奖励资金(20222014);太原科技大学校级博士科研启动基金(20202071);太原科技大学研究生教育创新项目(SY2023006)。

摘　　要：目的提高锆基块体非晶合金的韧性。方法将Nb颗粒粉末与锆基非晶粉末均匀混合,采用选区激光熔化技术制备不同含量(质量分数分别为0%、1%、5%、10%)Nb颗粒的锆基块体非晶复合材料。通过扫描电子显微镜、X射线衍射、透射电镜、纳米压痕及数值模拟等手段,重点研究不同Nb颗粒含量对非晶复合材料不同微区(熔池区、重熔区和热影响区)的微观组织形成机理和纳米压痕力学行为的影响规律。结果在非晶复合材料中,Nb颗粒均匀分布于非晶基体上,Nb颗粒与非晶基体结合的界面处存在200 nm左右的元素扩散层,未观察到新相产生。Nb颗粒的添加降低了熔池的流动性,导致复合材料内部的气孔增多。复合材料的不同微区呈现不同的微观组织特征,其中,熔池区为完全非晶状态,重熔区和热影响区由纳米晶和非晶基体组成。随着Nb颗粒含量的增加,材料的硬度、弹性模量和断裂韧性逐渐增大,在功率为90 W、Nb的质量分数为10%时,材料的弹性恢复率和断裂韧性达到最大值,分别为0.066、4.852 MPa·m^(1/2)。结论通过增加Nb的含量,促进了材料内部剪切带的增殖与分化,试样的硬度、弹性模量、弹性恢复率和断裂韧性明显提高。Bulk metallic glasses exhibit excellent physical,chemical and mechanical properties,which make them widely used in structural and functional material fields.However,bulk metallic glasses are constrained in their application due to intrinsic brittleness and size limitation of conventional preparation techniques.To address this issue,the work aims to introduce a reinforcement phase to improve the toughness of bulk metallic glass.The Zr-based bulk metallic glass composites with varying Nb particle contents(0%,1%,5%,and 10%,mass fractions)were successfully prepared by the selective laser melting technique.The phase composition analysis of the raw material and prepared samples was carried out by the X-ray diffraction,and the microstructure and morphology of different micro-zones(molten pool zone,remelting zone,and heat-affected zone)of the metallic glass composites and the distribution of internal Nb particles were observed by a scanning electron microscope.Moreover,transmission electron microscope and energy dispersive spectrometer were used to examine the interfacial morphology between Nb particles and the metallic glass matrix,and the nanoindentation test was conducted to analyze the mechanical properties of different micro-zones in the samples.The flow state of the molten pool was further analyzed by numerical simulation during selective laser melting process.Eventually,the effects of varying Nb particle contents on the forming quality,microstructure and morphology,and mechanical properties of the metallic glass composites were systematically investigated.The results showed that Nb particles were uniformly distributed in the metallic glass matrix with well-combined interfaces between the Nb particles and the metallic glass matrix.Moreover,some Zr,Ti,and Nb elements mainly dispersed in the interface,and no new crystalline phases were produced.However,some defects of porosity and microcracks were observed in the metallic glass composites.As the Nb particle content increased,the sample deformation and internal microc

关 键 词：选区激光熔化 块体非晶复合材料 微观组织 纳米压痕力学行为 

分 类 号：TG665[金属学及工艺—金属切削加工及机床]