Unlocking ultrahigh strength in dilute Al alloys: The synergy of stable grain boundary networks and solute clusters

doi:10.1016/j.actamat.2025.120758

IMR OpenIR

	Unlocking ultrahigh strength in dilute Al alloys: The synergy of stable grain boundary networks and solute clusters
	Fang, L.1,2; Xue, H. T.3; Zhang, B.1; Kong, Y.4; Xin, Y. C.1; Xu, W.1; Li, X. Y.1,4
通讯作者	Xu, W.(wxu@imr.ac.cn) ; Li, X. Y.(xyli@imr.ac.cn)
	2025-03-01
发表期刊	ACTA MATERIALIA
ISSN	1359-6454
卷号	286 页码:16
摘要	The strength of Al alloys can be significantly enhanced through grain refinement and aging hardening. However, improving strength through aging hardening in nanograins is challenging due to the poor structural stability, which leads to grain growth and precipitation coarsening. Herein, a nanostructured AA6061 alloy with grain size of 26 nm and a high proportion of relaxed grain boundaries (GB) was fabricated using cryogenic high-pressure torsion (HPT). During aging treatment, Mg-Si-Cu co-segregated at GBs and high density of Mg-Si solute clusters (approximately 5.6 x 1023 m-3) rather than intermetallic precipitates formed within the nanograins, resulting in a record strength as high as 805 MPa. The solute clusters exhibited an excellent thermal stability against prolonged aging at higher temperatures, which can be attributed to the stable GB networks. This work presents a promising prototype for designing high strength and thermally stable nanocrystalline Al alloys through the synergy of stable GB networks and solute clusters.
关键词	Al-Mg-Si Grain boundary relaxation Grain boundary segregation Thermal stability Solute clusters
资助者	Strategic Priority Research Program of the Chinese Academy of Sciences ; National Nat-ural Science Foundation of China ; Young Elite Scientists Sponsorship Program by CAST
DOI	10.1016/j.actamat.2025.120758
收录类别	SCI
语种	英语
资助项目	Strategic Priority Research Program of the Chinese Academy of Sciences[XDB0510401] ; National Nat-ural Science Foundation of China[52225102] ; National Nat-ural Science Foundation of China[52101161] ; Young Elite Scientists Sponsorship Program by CAST[2022QNRC001]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001406361000001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/180579
专题	中国科学院金属研究所
通讯作者	Xu, W.; Li, X. Y.
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 3.Lanzhou Univ Technol, Sch Mat Sci & Engn, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China 4.Liaoning Acad Mat, Shenyang 110004, Peoples R China
推荐引用方式 GB/T 7714	Fang, L.,Xue, H. T.,Zhang, B.,et al. Unlocking ultrahigh strength in dilute Al alloys: The synergy of stable grain boundary networks and solute clusters[J]. ACTA MATERIALIA,2025,286:16.
APA	Fang, L..,Xue, H. T..,Zhang, B..,Kong, Y..,Xin, Y. C..,...&Li, X. Y..(2025).Unlocking ultrahigh strength in dilute Al alloys: The synergy of stable grain boundary networks and solute clusters.ACTA MATERIALIA,286,16.
MLA	Fang, L.,et al."Unlocking ultrahigh strength in dilute Al alloys: The synergy of stable grain boundary networks and solute clusters".ACTA MATERIALIA 286(2025):16.