{"title":"选择性激光熔化增强SiC纳米颗粒增强CoCrFeMnNi纳米复合材料摩擦学性能","authors":"Asit Kumar Gain , Liangchi Zhang , Zhen Li","doi":"10.1016/j.wear.2025.206358","DOIUrl":null,"url":null,"abstract":"<div><div>The CoCrFeMnNi high-entropy alloy (HEA) is distinguished by its superior mechanical properties, machinability and corrosion resistance. However, its relatively low yield strength and inadequate wear resistance constrain its applicability in structural and tribological applications. To address these limitations, this study systematically investigates the incorporation of 5 vol% silicon carbide (SiC) nanoparticles into HEA via a selective laser melting (SLM) process, with the objective of enhancing its microstructural characteristics, mechanical properties and tribological performance. Microstructural analysis reveals that the homogeneous dispersion of SiC nanoparticles (35–50 nm) within both grain interiors and boundaries promotes significant grain refinement, leading to notable improvements in compressive yield strength (55.2 %), nanohardness (72.8 %) and elastic modulus (20.3 %) relative to the plain HEA. Tribological assessment demonstrates a substantial reduction in wear rate, with abrasive wear mechanisms prevailing at low loads. Under elevated loads, the unreinforced HEA undergoes pronounced plastic deformation and oxidation-induced degradation due to frictional heating, whereas the incorporation of SiC nanoparticles mitigates oxidation and induces a self-lubricating effect, thereby enhancing wear resistance. Worn subsurface characterization shows the formation of shear bands, high-density dislocation structures and localized nanohardness increases, elucidating the underlying deformation and wear mechanisms governing the enhanced tribological performance of the nanocomposite. These findings underscore the synergistic role of SiC nanoparticles in refining microstructure, strengthening mechanical properties and improving tribological behavior.</div></div>","PeriodicalId":23970,"journal":{"name":"Wear","volume":"582 ","pages":"Article 206358"},"PeriodicalIF":6.1000,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Enhancement of tribological performance of SiC nanoparticle-reinforced CoCrFeMnNi nanocomposites produced by selective laser melting\",\"authors\":\"Asit Kumar Gain , Liangchi Zhang , Zhen Li\",\"doi\":\"10.1016/j.wear.2025.206358\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>The CoCrFeMnNi high-entropy alloy (HEA) is distinguished by its superior mechanical properties, machinability and corrosion resistance. However, its relatively low yield strength and inadequate wear resistance constrain its applicability in structural and tribological applications. To address these limitations, this study systematically investigates the incorporation of 5 vol% silicon carbide (SiC) nanoparticles into HEA via a selective laser melting (SLM) process, with the objective of enhancing its microstructural characteristics, mechanical properties and tribological performance. Microstructural analysis reveals that the homogeneous dispersion of SiC nanoparticles (35–50 nm) within both grain interiors and boundaries promotes significant grain refinement, leading to notable improvements in compressive yield strength (55.2 %), nanohardness (72.8 %) and elastic modulus (20.3 %) relative to the plain HEA. Tribological assessment demonstrates a substantial reduction in wear rate, with abrasive wear mechanisms prevailing at low loads. Under elevated loads, the unreinforced HEA undergoes pronounced plastic deformation and oxidation-induced degradation due to frictional heating, whereas the incorporation of SiC nanoparticles mitigates oxidation and induces a self-lubricating effect, thereby enhancing wear resistance. Worn subsurface characterization shows the formation of shear bands, high-density dislocation structures and localized nanohardness increases, elucidating the underlying deformation and wear mechanisms governing the enhanced tribological performance of the nanocomposite. These findings underscore the synergistic role of SiC nanoparticles in refining microstructure, strengthening mechanical properties and improving tribological behavior.</div></div>\",\"PeriodicalId\":23970,\"journal\":{\"name\":\"Wear\",\"volume\":\"582 \",\"pages\":\"Article 206358\"},\"PeriodicalIF\":6.1000,\"publicationDate\":\"2025-09-23\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Wear\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0043164825006271\",\"RegionNum\":1,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, MECHANICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Wear","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0043164825006271","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
Enhancement of tribological performance of SiC nanoparticle-reinforced CoCrFeMnNi nanocomposites produced by selective laser melting
The CoCrFeMnNi high-entropy alloy (HEA) is distinguished by its superior mechanical properties, machinability and corrosion resistance. However, its relatively low yield strength and inadequate wear resistance constrain its applicability in structural and tribological applications. To address these limitations, this study systematically investigates the incorporation of 5 vol% silicon carbide (SiC) nanoparticles into HEA via a selective laser melting (SLM) process, with the objective of enhancing its microstructural characteristics, mechanical properties and tribological performance. Microstructural analysis reveals that the homogeneous dispersion of SiC nanoparticles (35–50 nm) within both grain interiors and boundaries promotes significant grain refinement, leading to notable improvements in compressive yield strength (55.2 %), nanohardness (72.8 %) and elastic modulus (20.3 %) relative to the plain HEA. Tribological assessment demonstrates a substantial reduction in wear rate, with abrasive wear mechanisms prevailing at low loads. Under elevated loads, the unreinforced HEA undergoes pronounced plastic deformation and oxidation-induced degradation due to frictional heating, whereas the incorporation of SiC nanoparticles mitigates oxidation and induces a self-lubricating effect, thereby enhancing wear resistance. Worn subsurface characterization shows the formation of shear bands, high-density dislocation structures and localized nanohardness increases, elucidating the underlying deformation and wear mechanisms governing the enhanced tribological performance of the nanocomposite. These findings underscore the synergistic role of SiC nanoparticles in refining microstructure, strengthening mechanical properties and improving tribological behavior.
期刊介绍:
Wear journal is dedicated to the advancement of basic and applied knowledge concerning the nature of wear of materials. Broadly, topics of interest range from development of fundamental understanding of the mechanisms of wear to innovative solutions to practical engineering problems. Authors of experimental studies are expected to comment on the repeatability of the data, and whenever possible, conduct multiple measurements under similar testing conditions. Further, Wear embraces the highest standards of professional ethics, and the detection of matching content, either in written or graphical form, from other publications by the current authors or by others, may result in rejection.