Ultrastrong spinodoid alloys enabled by electrochemical dealloying and refilling.
Ultrastrong spinodoid alloys enabled by electrochemical dealloying and refilling.
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DOI：
10.1073/pnas.2214773120
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发表时间：
2023-01-03
影响因子：
11.1
通讯作者：
Jin, Hai-Jun
中科院分区：
文献类型：
--
作者：
Guan, Huai;Xie, Hui;Luo, Zhao-Ping;Bao, Wei-Kang;You, Ze-Sheng;Jin, Zhaohui;Jin, Hai-Jun
亚稳分解可以引起纳米级组成波动，同时保持材料的每个晶粒内的晶体相干性，并导致优异的机械/物理性能的组合。然而，其可行的合金系统和成分调制的范围非常有限。在这里，我们报告说，一个类似的“spinodoid”结构可以形成选择性蚀刻和电化学填充代替。这种方法在甚至不可分解的合金中也是有效的，并且可以将成分调制推向极端，这已经引起了接近理论的强度，并且可能在未来实现其他前所未有的机械/功能特性。我们提出了一个极端的情况下，通过选择性蚀刻（脱合金）和电化学再填充形成的成分调制的纳米材料。该产品是由两个交织的纳米相，具有相同的晶体结构和立方体上的立方体的关系，由光滑弯曲的半相干界面与高密度失配位错分开的粗晶粒多晶。这种材料在结构上类似于亚稳合金，但其合成和成分调制与亚稳无关。我们的Cu/Au“spinodoid”合金表现出上级的机械性能，如接近理论强度和单相的行为，由于其精细的成分调制，大规模的晶格相干性，和平滑的三维（3D）界面形态。作为旋节线合金的独特延伸，本文报道的旋节线合金揭示了将材料的结构和组成调节到纳米级的许多可能性，使得可以实现常规材料无法比拟的进一步改进的性能。
Spinodal decomposition can induce nanoscale composition fluctuations while maintaining crystal coherency within each grain of a material and lead to a combination of excellent mechanical/physical properties. However, its viable alloy systems and the range of composition modulation are very limited. Here, we report that a similar “spinodoid” structure can be formed by selective etching and electrochemical refilling instead. This approach is operative in even undecomposable alloys and can push composition modulation to the extreme, which has induced near-theoretical strength and might enable other unprecedented mechanical/ functional properties in the future. We present an extreme case of composition-modulated nanomaterial formed by selective etching (dealloying) and electrochemical refilling. The product is a coarse-grain polycrystal consisting of two interwoven nanophases, with identical crystal structures and a cube-on-cube relationship, separated by smoothly curved semicoherent interfaces with high-density misfit dislocations. This material resembles spinodal alloys structurally, but its synthesis and composition modulation are spinodal-independent. Our Cu/Au “spinodoid” alloy demonstrates superior mechanical properties such as near-theoretical strength and single-phase-like behavior, owing to its fine composition modulation, large-scale coherence of crystal lattice, and smoothly shaped three-dimensional (3D) interface morphology. As a unique extension of spinodal alloy, the spinodoid alloy reported here reveals a number of possibilities to modulate the material’s structure and composition down to the nanoscale, such that further improved properties unmatchable by conventional materials can be achieved.
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影响因子：
9.4
作者：
Choo, WK;Kim, JH;Yoon, JC
通讯作者：
Yoon, JC
通过成分波动将拉伸延展性与超高强度结合起来
影响因子：
64.8
作者：
Li, Heng;Zong, Hongxiang;Sun, Jun
通讯作者：
Sun, Jun
影响因子：
8.6
作者：
Jin, Zhaohui;Li, Xiuyan;Lu, K.
通讯作者：
Lu, K.
DOI：
10.1016/0001-6160(62)90114-1
发表时间：
1962-01-01
期刊：
ACTA METALLURGICA
影响因子：
--
作者：
CAHN, JW
通讯作者：
CAHN, JW
影响因子：
56.9
作者：
Li, X. Y.;Jin, Z. H.;Lu, K.
通讯作者：
Lu, K.