循环应变多晶铜晶间断口附近的位错结构

IF 3.2 2区 材料科学 Q2 ENGINEERING, MECHANICAL
Jaroslav Polák, Ladislav Poczklán, Tomáš Vražina
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引用次数: 0

摘要

对多晶铜试样进行应变幅循环,得到105 ~ 107次循环的疲劳寿命。对断口进行了扫描电镜观察,并对具有表面起伏的晶间切面进行了研究。制备了FIB切片,并用FIB切片制备了用于透射电镜的薄片。切面上的个别持久滑动痕迹,由独特的挤压和侵入组成,与表面呈一定角度倾斜,对应于原始滑动面的痕迹。观察并分析了靠近切面表面的位错结构。位错结构由随机分布的位错和一些位错亚边界组成。与试样表面下的位错结构相反,没有发现与持续滑移带相对应的特定位错结构。讨论了局部循环应变诱发位错模式的缺失,并将其归因于扩展裂纹的循环塑性区内复杂的应力和应变历史,其中多个滑移系统活跃。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Dislocation Structure Near the Intergranular Fracture Surface of Cyclically Strained Polycrystalline Copper

Polycrystalline copper specimens were cycled with strain amplitudes, resulting in fatigue lives ranging from 105 to 107 cycles. The fracture surfaces were inspected in the SEM, and intergranular facets with surface relief were studied. FIB sections were produced, and lamellae for the TEM were prepared using FIB sectioning. Individual persistent slip markings on the facets, consisting of distinctive extrusions and intrusions, were inclined at an angle to the surface corresponding to the trace of the primary slip plane. Dislocation structures close to the surface of the facets were observed and analyzed. The dislocation structure consisted of randomly distributed dislocations and some dislocation sub-boundaries. Contrary to the dislocation structure below the specimen surface, no specific dislocation structures corresponding to the persistent slip bands were found. The absence of localized cyclic strain-induced dislocation patterns was discussed and attributed to the complex stress and strain history within the cyclic plastic zone of the propagating crack, where multiple slip systems were active.

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来源期刊
CiteScore
6.30
自引率
18.90%
发文量
256
审稿时长
4 months
期刊介绍: Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.
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