摘要
粘结剂喷射3D打印(BJ3DP)技术因其独特优势而受到广泛关注,然而,粉末床打印工艺需要球形粉末,限制了一些熔点差较大的高熵合金粉末的制备以及打印成形。本工作主要针对非球形颗粒的BJ3DP-烧结行为开展研究。结果表明,采用机械合金化法制备了bcc结构的不规则AlTiCrNiCu低密度高熵合金粉末,其粒径分布为6.72~67.52μm,平均粒径为21.17μm,满足BJ3DP工艺要求。正交试验结果表明,在保证生坯形貌完整条件下:当粘结剂饱和度为70%、层厚为120μm和铺粉速度为5 mm/s时,BJ3DP的生坯致密度较高(约44.4%)。生坯经过1190℃/4 h烧结后,其块体的致密度达到91.6%。AlTiCrNiCu低密度高熵合金为多相结构,基体为B2相,还包括bcc、fcc和少量L2_(1)相。该合金具有高的抗压缩性能,其屈服强度和抗压强度分别约为840和960 MPa。
The binder jet 3D printing(BJ3DP)process is currently a research hotspot.Generally,the powder bed printing process requires spherical powders,which limits the preparation and fabrication of some high-entropy alloy(HEA)powders with significant melting point differences.This study mainly focuses on the BJ3DP-sintering behavior of non-spherical particles.The results show that the non-spherical AlTiCrNiCu low-density HEA powder with bcc structure was prepared via mechanical alloying,with a particle size distribution of 6.72-67.52μm and an average particle size of 21.17μm,which complies with the process requirements of BJ3DP.The results of orthogonal experiment indicate that under the condition of ensuring green part morphology integrity,the higher green density(approximately 44.4%)is achieved in BJ3DP with a binder saturation of 70%,a layer thickness of 120μm,and a powder spreading speed of 5 mm/s.After sintering at 1190℃ for 4 h,the relative density of the sintered sample reaches 91.6%.The AlTiCrNiCu low-density HEA exhibits a multiphase structure consisting of B2 phase as matrix,along with bcc,fcc,and a small amount of L2_(1) phase.The AlTiCrNiCu low-density HEA exhibits high compressive properties,with a yield strength and compressive strength of approximately 840 and 960 MPa,respectively.
作者
朱德智
陈海鹏
蔡良福
Zhu Dezhi;Chen Haipeng;Cai Liangfu(Guangdong Key Laboratory for Processing and Forming of Advanced Metallic Materials,South China University of Technology,Guangzhou 510640,China)
出处
《稀有金属材料与工程》
北大核心
2026年第1期116-123,共8页
Rare Metal Materials and Engineering
基金
国家自然科学基金(52271029)
广东省基础与应用基础研究基金(2022B1515120016)
江西省重点研发计划(20212BBE51012)
江西省技术创新引导类计划(20212BDH81012)。
关键词
粘结剂喷射3D打印
低密度高熵合金
烧结
致密化
binder jet 3D printing
low-density high-entropy alloy
sintering
densification
