| Anisotropic mechanical properties and deformation mechanisms of nanotwinned Ni and Ni alloys with extremely fine twin boundary spacings | |
| Duan, Fenghui1; Li, Qian2,3; Shen, Zheling3,4; Jiang, Zhihao1; Liu, Wenbin1; Yan, Yang1; Pan, Jie5; Sun, Ligang6; Lu, Jian1,7,8 | |
| Corresponding Author | Sun, Ligang(sunligang@hit.edu.cn) ; Lu, Jian(jianlu@cityu.edu.hk) |
| 2023-11-01 | |
| Source Publication | ACTA MATERIALIA
 |
| ISSN | 1359-6454 |
| Volume | 260Pages:12 |
| Abstract | 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. |
| Keyword | Nanotwins Anisotropic mechanical behavior Continuous strengthening Extremely fine twin boundary spacing Localized plasticity |
| Funding Organization | Commission of Shenzhen Municipality |
| DOI | 10.1016/j.actamat.2023.119311 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | Commission of Shenzhen Municipality[ZDSYS20210616110000001] |
| WOS Research Area | Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| WOS ID | WOS:001072563900001 |
| Publisher | PERGAMON-ELSEVIER SCIENCE LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/179291 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Sun, Ligang; Lu, Jian |
| Affiliation | 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 |
| Recommended Citation 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. |
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