材料科学
各向异性
延展性(地球科学)
纹理(宇宙学)
流动应力
极限抗拉强度
复合材料
压力(语言学)
铌
图层(电子)
横截面
凝聚态物理
冶金
合金
结构工程
蠕动
光学
人工智能
哲学
工程类
物理
图像(数学)
语言学
计算机科学
作者
Thomas J. Nizolek,Irene J. Beyerlein,Nathan A. Mara,Jaclyn T. Avallone,Tresa M. Pollock
摘要
The flow stress, ductility, and in-plane anisotropy are evaluated for bulk accumulative roll bonded copper-niobium nanolaminates with layer thicknesses ranging from 1.8 μm to 15 nm. Uniaxial tensile tests conducted parallel to the rolling direction and transverse direction demonstrate that ductility generally decreases with decreasing layer thickness; however, at 30 nm, both high strengths (1200 MPa) and significant ductility (8%) are achieved. The yield strength increases monotonically with decreasing layer thickness, consistent with the Hall-Petch relationship, and significant in-plane flow stress anisotropy is observed. Taylor polycrystal modeling is used to demonstrate that crystallographic texture is responsible for the in-plane anisotropy and that the effects of texture dominate even at nanoscale layer thicknesses.
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