Strengthening and Toughening Mechanisms of Precipitation-Hardened Fe53Mn15Ni15Cr10Al4Ti2C1 High-Entropy Alloy

doi:10.11900/0412.1961.2021.00242

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	Strengthening and Toughening Mechanisms of Precipitation-Hardened Fe53Mn15Ni15Cr10Al4Ti2C1 High-Entropy Alloy
	Sun Shijie 1; Tian Yanzhong 2; Zhang Zhefeng 1
刊名	ACTA METALLURGICA SINICA
	2022-01-11
卷号	58 期号:1 页码:54-66
关键词	high-entropy alloy precipitation strengthening inhomogeneous microstructure strength ductility
ISSN号	0412-1961
DOI	10.11900/0412.1961.2021.00242
通讯作者	Zhang Zhefeng(zhfzhang@imr.ac.cn)
英文摘要	There has been significant progress in the development of high-entropy alloys (HEAs) with unconventional compositions in the past decade to meet the demand from a wide variety of industries, such as automotive, shipbuilding, and aerospace. The fcc HEAs have attracted growing attention due to their superior mechanical and functional properties. However, these HEAs exhibit low or modest yield strength, limiting their potential industrial application. To enhance the strength of the fcc HEAs, materials researchers are exploring additional strengthening methods, such as grain refinement, solid solution strengthening, and precipitation strengthening. However, the strengthening approaches mentioned above suffer from the trade-off dilemma between strength and ductility. In this study, a new precipitation-hardened Fe53Mn15Ni15Cr10Al4Ti2C1 HEA was designed by adding Al, Ti, and C elements based on the fcc HEA. Then the HEA was treated utilizing heavy-deformation and various heat-treatment processes, tuning the microstructure and precipitate. The cold-rolled alloy microstructure presented rolling bands (including deformation twins) and a significant dislocation density. Furthermore, the HEA microstructure consists of rolling bands, high-density dislocations, and nanoscale precipitates following heat treatment at medium temperatures for an extended period. In particular, the HEA possessed a superior balance between strength and ductility, resulting from the significant precipitation strengthening effect of L1(2) precipitates that were coherent with the matrix in the microstructure as well as the improved strain-hardening ability due to the recovery of dislocations. The precipitation-hardened HEA with an inhomogeneous microstructure could be obtained through heat treatment at medium temperatures over long periods, which exhibited an excellent strength-ductility relationship.
资助项目	Fundamental Research Funds for the Central Universities[N180204015] ; Liaoning Revitalization Talents Program[XLYC1808027] ; Special Research Assistant Program of Chinese Academy of Sciences ; IMR Innovation Fund[2021-PY16]
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000773693600005
资助机构	Fundamental Research Funds for the Central Universities ; Liaoning Revitalization Talents Program ; Special Research Assistant Program of Chinese Academy of Sciences ; IMR Innovation Fund
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/173089]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zhang Zhefeng
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Peoples R China
推荐引用方式 GB/T 7714	Sun Shijie,Tian Yanzhong,Zhang Zhefeng. Strengthening and Toughening Mechanisms of Precipitation-Hardened Fe53Mn15Ni15Cr10Al4Ti2C1 High-Entropy Alloy[J]. ACTA METALLURGICA SINICA,2022,58(1):54-66.
APA	Sun Shijie,Tian Yanzhong,&Zhang Zhefeng.(2022).Strengthening and Toughening Mechanisms of Precipitation-Hardened Fe53Mn15Ni15Cr10Al4Ti2C1 High-Entropy Alloy.ACTA METALLURGICA SINICA,58(1),54-66.
MLA	Sun Shijie,et al."Strengthening and Toughening Mechanisms of Precipitation-Hardened Fe53Mn15Ni15Cr10Al4Ti2C1 High-Entropy Alloy".ACTA METALLURGICA SINICA 58.1(2022):54-66.