Ultrastrong nanotwinned pure nickel with extremely fine twin thickness.
Ultrastrong nanotwinned pure nickel with extremely fine twin thickness.
复制标题
超强纳米孪晶纯镍，孪晶厚度极细
DOI：
10.1126/sciadv.abg5113
复制
发表时间：
2021-06
期刊：
影响因子：
13.6
通讯作者：
Li Y
中科院分区：
文献类型：
--
作者：
Duan F;Lin Y;Pan J;Zhao L;Guo Q;Zhang D;Li Y
在具有极细孪晶厚度的Ni中实现了连续强化和抗弯强度。当纳米晶和纳米孪晶金属的晶粒尺寸或孪晶厚度低于临界尺寸时，纳米晶和纳米孪晶金属的强度停止增加，甚至开始降低，这种现象称为Hall-Petch击穿，这阻碍了纳米晶金属强度的获得。在这里，我们报告连续强化纳米孪晶纯镍的孪晶厚度范围从81.0到2.9 nm。在2.9 nm的极细孪晶厚度下实现了前所未有的4.0 GPa强度，这比常规粗晶镍强约12倍。这种位错强度来自于孪晶晶界的良好稳定性及其对位错运动的强阻抗。特别是，我们发现二次纳米孪晶被激活，以维持塑性变形，这也有助于高强度。这些结果不仅推进了对纳米孪晶金属强化机制的理解，而且为开发具有纳米强度的工程材料提供了另一种途径。
Continuous strengthening and ultrahigh strength are realized in Ni with extremely fine twin thickness. The strength of nanocrystalline and nanotwinned metals stops increasing or even starts decreasing when their grain size or twin thickness is below a critical size—a phenomenon known as Hall-Petch breakdown—which hinders the attainment of ultrahigh strength. Here, we report continuous strengthening in nanotwinned pure Ni with twin thicknesses ranging from 81.0 to 2.9 nm. An unprecedented strength of 4.0 GPa was achieved at extremely fine twin thickness of 2.9 nm, which is about 12 times stronger than that of conventional coarse-grained nickel. This ultrahigh strength arises from the excellent stability of twin boundaries and their strong impedance to dislocation motion. In particular, we find that secondary nanotwins are activated to sustain plastic deformation, which also contribute to the high strength. These results not only advance the understanding of the strengthening mechanisms in nanotwinned metals but also offer an alternative pathway to develop engineering materials with ultrahigh strength.
登录
查看更多内容
影响因子：
4.6
作者：
Lee, Joon Hwan;Holland, Troy B.;Mukherjee, Amiya K.;Zhang, Xinghang;Wang, Haiyan
通讯作者：
Wang, Haiyan
影响因子：
9.4
作者：
Ott, R. T.;Geng, J.;King, A. H.
通讯作者：
King, A. H.
影响因子：
41.2
作者：
Ke, Xing;Ye, Jianchao;Sansoz, Frederic
通讯作者：
Sansoz, Frederic
DOI：
10.1016/s0965-9773(99)00050-1
发表时间：
1999-05-01
期刊：
NANOSTRUCTURED MATERIALS
影响因子：
--
作者：
Ebrahimi, F;Bourne, GR;Matthews, TE
通讯作者：
Matthews, TE
DOI：
10.1016/j.msea.2005.03.001
发表时间：
2005-04-25
影响因子：
6.4
作者：
Krasilnikov, N;Lojkowski, W;Valiev, R
通讯作者：
Valiev, R