Distinct driven steady states emerge from diverse initial textures in rolled nanocomposites
Distinct driven steady states emerge from diverse initial textures in rolled nanocomposites
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DOI：
10.1016/j.actamat.2019.10.058
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发表时间：
2020-01
期刊：
影响因子：
9.4
通讯作者：
I. Chesser;E. Holm;M. Demkowicz
中科院分区：
文献类型：
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作者：
I. Chesser;E. Holm;M. Demkowicz
剧烈塑性变形是制造高性能金属材料的一种广泛使用的方法。经历严重塑性变形的单相多晶金属会形成稳态织构，这是变形模式的特征。相比之下，我们表明两相 Cu-Nb 纳米层压复合材料在单一变形模式下达到各种不同的稳态织构。使用分子静力学模拟和晶体旋转分析的新颖算法，我们观察到这些材料的最终稳态织构和界面特征取决于复合材料的初始织构。这一发现表明，通过严重塑性变形可能形成的块状 Cu-Nb 纳米复合材料织构的范围比之前证明的要大，并且根据初始织构，可以获得多种塑性驱动的稳态。我们提出了对具有高纹理种子层的累积辊压粘合的修改，作为在层状复合材料中获得不同驱动稳态的一种手段。
Severe plastic deformation is a widespread method of making high-performance metallic materials. Single-phase polycrystalline metals undergoing severe plastic deformation develop steady-state textures that are characteristic of the mode of deformation. By contrast, we show that two-phase, Cu-Nb nano-laminate composites reach a variety of different steady-state textures under a single mode of deformation. Using molecular statics simulations and a novel algorithm for crystal rotation analysis, we observe that the final, steady state texture and interface character in these materials depends on the initial texture of the composite. This finding suggests that the range of bulk Cu-Nb nano-composite textures that may be made by severe plastic deformation is larger than previously demonstrated, with multiple plastically-driven steady states accessible, depending on initial texture. We propose a modification of accumulative roll bonding with highly textured seed layers as a means of accessing different driven steady states in layered composites.