增强体形貌对高熵合金增强铸铝合金组织及性能的影响  

Effect of Reinforcement Morphology on Microstructure and Properties of High-Entropy Alloy Particles Reinforced Cast Aluminum Alloy

作　　者：赵彬 朱德智[1] 温冬宝 詹泉泉 陈龙[1] Zhao Bin;Zhu Dezhi;Wen Dongbao;Zhan Quanquan;Chen Long(Guangdong Key Laboratory for Metallic Materials Processing,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学广东省金属新材料制备与成形重点实验室

出　　处：《稀有金属材料与工程》2019年第12期4004-4009,共6页Rare Metal Materials and Engineering

基　　金：工信部绿色制造系统集成项目（2017（No.83））;中央高校基本科研业务费项目（2018MS47）;江西省重点研发计划项目（20171ACH80012）;佛山市科技创新项目（2016AG101761）;广东省自然科学基金（2018A010103006）

摘　　要：采用机械合金化工艺制备了2种不同形貌特征的高熵合金(Al0.25Cu0.75FeCoNi)颗粒,一种为椭球状颗粒(平均粒径约为53μm,无过程控制剂);另一种为片状颗粒(平均粒径为15μm,有过程控制剂)。采用挤压铸造工艺制备了低体积分数(颗粒含量为5vol%)的高熵合金颗粒增强铸造铝合金材料,重点分析了不同增强相形貌对复合材料的组织和力学性能的影响规律。结果表明:在复合材料预制块制备过程中,椭球状高熵合金粉体与铝粉容易混合均匀,而片状高熵合金粉体之间易发生团聚。椭球状颗粒与片状颗粒增强的复合材料的抗拉强度分别达到162和174 MPa,比铸铝合金实验基体分别提升了12.5%和20.8%,但伸长率较铸铝合金基体有明显下降。断口分析表明,椭球状颗粒增强复合材料的断裂以基体的撕裂为主;而片状颗粒增强复合材料则以团聚颗粒的破裂为主。Two kinds of morphological high-entropy alloy particles(Al0.25 Cu0.75 FeCoNi) were prepared by mechanical alloying. One is ellipsoidal particles(average particle size 53 μm, no control agent), while the other is flake particles(average particle size 15 μm, with control agent). High-entropy alloy particles reinforced cast aluminum alloy(volume 5 vol%) was prepared by squeeze casting. The influence of different reinforcement morphologies on the microstructure and mechanical properties of composites was analyzed. The results show that in the preparation process of precast block, ellipsoidal ones are easily mixed uniformly with aluminum powder, while the flake are prone to agglomeration. The tensile strengths of the ellipsoidal and the flake particles reinforced composites reach 162 and 174 MPa, respectively, which are 12.5% and 20.8% higher than that of matrix alloy, but the elongations are significantly lower. Fracture analysis shows that the fracture of ellipsoidal particles reinforced composite is dominated by the tear of the matrix, while the flake particles reinforced composite is dominated by the rupture of agglomeration.

关 键 词：铸造铝合金 高熵合金 微观组织 性能 

分 类 号：TB331[一般工业技术—材料科学与工程]