Yawei Peng , Donghui Chen , Yang Yao , Han Duan , Jianming Gong
{"title":"低温气体渗碳对CoCrFeMnNi高熵合金力学和摩擦学性能的影响","authors":"Yawei Peng , Donghui Chen , Yang Yao , Han Duan , Jianming Gong","doi":"10.1016/j.intermet.2025.108900","DOIUrl":null,"url":null,"abstract":"<div><div>This study investigated the effect of low-temperature gas carburization (LTGC) on CoCrFeMnNi high-entropy alloy (HEA), focusing on the associated microstructural evolution, as well as the resulting changes in mechanical and tribological properties. The findings demonstrate that LTGC is an effective surface strengthening treatment for CoCrFeMnNi HEA. After LTGC, a ∼32 μm thick carburized case forms on the alloy surface, characterized by high hardness (∼12.8 GPa) and high compressive residual stress (∼2.5 GPa). This case consists of an expanded FCC phase, which is a carbide-free, supersaturated interstitial solid solution of carbon atoms in the FCC lattice. LTGC exerts limited influence on the macroscopic tensile properties of CoCrFeMnNi HEA, it leads to a modest increase in ultimate tensile strength, with slight reductions in yield strength and elongation. While, LTGC can significantly improves the tribological performance, reducing the volumetric wear rate from 11.4 × 10<sup>−4</sup> to 0.45 × 10<sup>−4</sup> mm<sup>3</sup>/Nm and decreasing the coefficient of friction from 0.51 to 0.49. Additionally, the wear mechanism transitions from a combination of abrasive, adhesive, oxidative, and fatigue wear to a mixed wear mechanism primarily governed by abrasion and oxidation after LTGC.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108900"},"PeriodicalIF":4.3000,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effect of low-temperature gaseous carburization on mechanical and tribological properties of CoCrFeMnNi high-entropy alloy\",\"authors\":\"Yawei Peng , Donghui Chen , Yang Yao , Han Duan , Jianming Gong\",\"doi\":\"10.1016/j.intermet.2025.108900\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>This study investigated the effect of low-temperature gas carburization (LTGC) on CoCrFeMnNi high-entropy alloy (HEA), focusing on the associated microstructural evolution, as well as the resulting changes in mechanical and tribological properties. The findings demonstrate that LTGC is an effective surface strengthening treatment for CoCrFeMnNi HEA. After LTGC, a ∼32 μm thick carburized case forms on the alloy surface, characterized by high hardness (∼12.8 GPa) and high compressive residual stress (∼2.5 GPa). This case consists of an expanded FCC phase, which is a carbide-free, supersaturated interstitial solid solution of carbon atoms in the FCC lattice. LTGC exerts limited influence on the macroscopic tensile properties of CoCrFeMnNi HEA, it leads to a modest increase in ultimate tensile strength, with slight reductions in yield strength and elongation. While, LTGC can significantly improves the tribological performance, reducing the volumetric wear rate from 11.4 × 10<sup>−4</sup> to 0.45 × 10<sup>−4</sup> mm<sup>3</sup>/Nm and decreasing the coefficient of friction from 0.51 to 0.49. Additionally, the wear mechanism transitions from a combination of abrasive, adhesive, oxidative, and fatigue wear to a mixed wear mechanism primarily governed by abrasion and oxidation after LTGC.</div></div>\",\"PeriodicalId\":331,\"journal\":{\"name\":\"Intermetallics\",\"volume\":\"185 \",\"pages\":\"Article 108900\"},\"PeriodicalIF\":4.3000,\"publicationDate\":\"2025-06-27\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Intermetallics\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0966979525002651\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Intermetallics","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0966979525002651","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Effect of low-temperature gaseous carburization on mechanical and tribological properties of CoCrFeMnNi high-entropy alloy
This study investigated the effect of low-temperature gas carburization (LTGC) on CoCrFeMnNi high-entropy alloy (HEA), focusing on the associated microstructural evolution, as well as the resulting changes in mechanical and tribological properties. The findings demonstrate that LTGC is an effective surface strengthening treatment for CoCrFeMnNi HEA. After LTGC, a ∼32 μm thick carburized case forms on the alloy surface, characterized by high hardness (∼12.8 GPa) and high compressive residual stress (∼2.5 GPa). This case consists of an expanded FCC phase, which is a carbide-free, supersaturated interstitial solid solution of carbon atoms in the FCC lattice. LTGC exerts limited influence on the macroscopic tensile properties of CoCrFeMnNi HEA, it leads to a modest increase in ultimate tensile strength, with slight reductions in yield strength and elongation. While, LTGC can significantly improves the tribological performance, reducing the volumetric wear rate from 11.4 × 10−4 to 0.45 × 10−4 mm3/Nm and decreasing the coefficient of friction from 0.51 to 0.49. Additionally, the wear mechanism transitions from a combination of abrasive, adhesive, oxidative, and fatigue wear to a mixed wear mechanism primarily governed by abrasion and oxidation after LTGC.
期刊介绍:
This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys.
The journal reports the science and engineering of metallic materials in the following aspects:
Theories and experiments which address the relationship between property and structure in all length scales.
Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations.
Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties.
Technological applications resulting from the understanding of property-structure relationship in materials.
Novel and cutting-edge results warranting rapid communication.
The journal also publishes special issues on selected topics and overviews by invitation only.