表面技术2025，Vol.54Issue(3)：110-117,8.DOI:10.16490/j.cnki.issn.1001-3660.2025.03.009
等离子原位制备VC增强Al1.5CoCrFeNi高熵合金熔覆层的组织与力学性能
Microstructure and Mechanical Properties of VC Enhanced Ali.5CoCrFeNi High-entropy Alloy Cladding Layers by Plasma in Situ Synthesis Technique
摘要
Abstract
The work aims to prepare in situ carbide enhanced BCC structure high-entropy alloy cladding layers,and study the effect of design content of carbide on their microstructure and mechanical properties.Therefore,in situ VC enhanced Al1.5CoCrFeNi(VC)x(x=0,0.1,0.2,0.3,mole ratio)high-entropy alloy were manufactured on the Q235 steel by plasma cladding.The effect of VC design content on their phases,microstructure,and mechanical properties were analyzed. Al,Co,Cr,Fe,Ni,vanadium-iron alloy(50％V,50％Fe)and high carbon ferrochrome(7％C,30％Fe,63％Cr)powders were mixed according to the atomic ratio of Al1.5CoCrFeNi(VC)v(x=0,0.1,0.2,0.3,mole ratio).The particle size range of the above powders was 100-200 mesh.Q235 steel was selected as substrate,whose surface was polished and rinsed with acetone before plasma cladding.A plasma spray welding machine(PT-400E4-ST)was used to produce cladding layers.The phases,morphologies,and element compositions of cladding layers were analyzed by X-ray diffractometer(XRD,XRD-7000),scanning electron microscope(SEM,S-3400),energy dispersive spectrometer(EDS)and transmission electron microscope(TEM,JEM2100),respectively.The microhardness of cladding layers were measured by microhardness tester(HXD-1000).The wear properties of cladding layers were evaluated by abrasive wear testing machine(MLS-225). The results indicated that when x=0,the cladding layer was BCC solid-solution and its microstructure was typical dendrite structure.The dendrite was BCC solid-solution rich in Al and Ni,and the interdendrite was BCC solid-solution rich in Cr and Fe.After adding V and C(x=0.1,0.2,0.3),the diffraction peaks of cladding layers were composed of BCC solid-solution,VC and a few σ phases.The shape of VC was polygonal granular,long striplight and cross-dendrite.The VC mostly segregated at interdendrite,but only a few inside the dendrite.And with the increase of V and C content,the precipitation amount of VC also increased.TEM results indicated that the interface between the in situ VC and the matrix was clean without other reacting products.With the increase of VC design content from x=0 to x=0.3,the hardness of cladding layers increased from 529.3HV to 829.8HV,and weight loss rate reduced from 34.88 mg/min to 2.45 mg/min.When x=0,the wear mechanism of the cladding layer was mainly microscopic cutting,supplemented by repeated plastic deformation.After adding V and C(x=0.1,0.3),the wear mechanism of cladding layers was mainly microscopic cutting.In situ VC plays an obvious strengthening role in the high-entropy alloy.With the increase of VC design content from x=0 to x=0.3,the hardness and wear resistance of the cladding layers are increased.关键词
等离子熔覆/原位合成/高熵合金/VC/微观组织/力学性能Key words
plasma cladding/in situ synthesized/high-entropy alloy/VC/microstructure/mechanical properties分类
通用工业技术引用本文复制引用
王虎,秦晓婷,王智慧,贺定勇..等离子原位制备VC增强Al1.5CoCrFeNi高熵合金熔覆层的组织与力学性能[J].表面技术,2025,54(3):110-117,8.基金项目
中央引导地方科技发展资金项目(246Z1816G) （246Z1816G）
北华航天工业学院科研基金项目(CXPT202402) Central Government Guided Local Development Foundation(246Z1816G) （CXPT202402）
The Research Fund Project Project of North China Institute of Aerospace Engineering(CXPT202402) （CXPT202402）
