In-situ study of rules of nanostructure evolution, severe plastic deformations, and friction under high pressure
In-situ study of rules of nanostructure evolution, severe plastic deformations, and friction under high pressure
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DOI：
10.1080/21663831.2023.2231983
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发表时间：
2023-03
影响因子：
8.3
通讯作者：
F. Lin;V. Levitas;K. Pandey;Sorb Yesudhas;Changyong Park
中科院分区：
文献类型：
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作者：
F. Lin;V. Levitas;K. Pandey;Sorb Yesudhas;Changyong Park
高压下的剧烈塑性变形被用于生产纳米结构材料，但研究是在非原位的。粗糙金刚石砧被引入到达到最大摩擦等于屈服强度在剪切和第一次原位研究的演变的压力依赖性屈服强度和径向分布的纳米结构参数进行严重预变形锆。ω-Zr表现为完全塑性、各向同性和应变路径无关，并达到稳定的晶粒尺寸和位错密度值，这些值与压力、应变和应变路径无关。然而，α-Zr的稳态获得与光滑和粗糙砧是不同的，造成塑性理论的重大挑战。用粗糙金刚石砧对ω-Zr的严重塑性变形进行的原位研究表明，与压力相关的屈服强度、微晶尺寸和位错密度变得稳定，并且与塑性应变和应变路径无关。
Severe plastic deformations under high pressure are used to produce nanostructured materials but were studied ex-situ. Rough diamond anvils are introduced to reach maximum friction equal to yield strength in shear and the first in-situ study of the evolution of the pressure-dependent yield strength and radial distribution of nanostructural parameters are performed for severely pre-deformed Zr. ω-Zr behaves like perfectly plastic, isotropic, and strain-path-independent and reaches steady values of the crystallite size and dislocation density, which are pressure-, strain- and strain-path-independent. However, steady states for α-Zr obtained with smooth and rough anvils are different, causing major challenge in plasticity theory. GRAPHICAL ABSTRACT IMPACT STATEMENT In-situ study of severe plastic deformation of ω-Zr with rough diamond anvils revealed that pressure-dependent yield strength, crystallite size, and dislocation density are getting steady and plastic strain- and strain-path-independent.