Anisotropic mechanical properties and deformation mechanisms of nanotwinned Ni and Ni alloys with extremely fine twin boundary spacings

doi:10.1016/j.actamat.2023.119311

IMR OpenIR

	Anisotropic mechanical properties and deformation mechanisms of nanotwinned Ni and Ni alloys with extremely fine twin boundary spacings
	Duan, Fenghui 1; Li, Qian 2,3; Shen, Zheling 3,4; Jiang, Zhihao 1; Liu, Wenbin 1; Yan, Yang 1; Pan, Jie 5; Sun, Ligang 6; Lu, Jian 1,7,8
通讯作者	Sun, Ligang(sunligang@hit.edu.cn) ; Lu, Jian(jianlu@cityu.edu.hk)
	2023-11-01
发表期刊	ACTA MATERIALIA
ISSN	1359-6454
卷号	260 页码:12
摘要	Introducing nanotwins with extremely fine twin boundary spacing (TBSs & LE; 10 nm) in metals with high stacking fault energy (SFE) has posed a longstanding challenge, hindering an in-depth understanding of their strengthening mechanisms. Here, we synthesized a series of columnar-grained nanotwinned structures with extremely fine TBSs in Ni and Ni alloys with high SFEs, and systematically investigated their mechanical responses under various loading directions relative to the coherent twin boundaries (CTBs). Under the loading directions of 90 degrees and 0 degrees, contrary to the softening effect observed in nanotwinned metals with equiaxed grains, continuous strengthening was found to extend to the finest TBS of 1.9 nm in the columnar-grained nanotwinned Ni and Ni alloy. This resulted in an ultra-high strength of 4.46 and 3.80 GPa, respectively. Combined experimental and simulational studies were employed to investigate the mechanism for continuous strengthening. As the TBS decreased to a critical value (3-5 nm), the strengthening mechanism was revealed to transform from CTB obstructing dislocations to the dislocation starvation-dominated mechanism, which led to a shift in deformation behavior from homogeneous to localized plasticity. Distinct from the detwinning-induced softening effect, the dislocation-starvation mechanism resulted in continuous strengthening, with the yield strength following a power-law function concerning TBS. Additionally, our results illustrate that nanotwins deformed via significant detwinning at the loading direction of 45 degrees, leading to strengthening that primarily depends mainly on the column width rather than TBS.
关键词	Nanotwins Anisotropic mechanical behavior Continuous strengthening Extremely fine twin boundary spacing Localized plasticity
资助者	Commission of Shenzhen Municipality
DOI	10.1016/j.actamat.2023.119311
收录类别	SCI
语种	英语
资助项目	Commission of Shenzhen Municipality[ZDSYS20210616110000001]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001072563900001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：8[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/179291
专题	中国科学院金属研究所
通讯作者	Sun, Ligang; Lu, Jian
作者单位	1.City Univ Hong Kong, Dept Mech Engn, Lab Nanomat & Nanomech, Hong Kong, Peoples R China 2.City Univ Hong Kong, Dept Mat Sci & Engn, Hong Kong, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 4.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China 5.Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Peoples R China 6.Harbin Inst Technol, Sch Sci, Shenzhen, Peoples R China 7.City Univ Hong Kong, Ctr Adv Struct Mat, Greater Bay Joint Div, Shenyang Natl Lab Mat Sci,Shenzhen Res Inst, Shenzhen, Peoples R China 8.CityU Shenzhen Futian Res Inst, Shenzhen 518045, Peoples R China
推荐引用方式 GB/T 7714	Duan, Fenghui,Li, Qian,Shen, Zheling,et al. Anisotropic mechanical properties and deformation mechanisms of nanotwinned Ni and Ni alloys with extremely fine twin boundary spacings[J]. ACTA MATERIALIA,2023,260:12.
APA	Duan, Fenghui.,Li, Qian.,Shen, Zheling.,Jiang, Zhihao.,Liu, Wenbin.,...&Lu, Jian.(2023).Anisotropic mechanical properties and deformation mechanisms of nanotwinned Ni and Ni alloys with extremely fine twin boundary spacings.ACTA MATERIALIA,260,12.
MLA	Duan, Fenghui,et al."Anisotropic mechanical properties and deformation mechanisms of nanotwinned Ni and Ni alloys with extremely fine twin boundary spacings".ACTA MATERIALIA 260(2023):12.