Effects of Thickness and Crystallographic Orientation on Fatigue Life of Single-Crystalline Copper Foils

Kammuri, Kazuki; Kitamura, Masashi; Fujii, Toshiyuki; Kato, Masaharu

doi:10.2320/matertrans.m2014352

Cited by 6 publications

(1 citation statement)

References 20 publications

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“…found that double‐slip‐oriented single crystals had longer fatigue lives compared with single‐slip‐oriented single crystals. Kammuri et al . probed the t effect on the N f of pure Cu single‐crystal foils with two different orientations of [

21 \bar{1}

] and [5

\bar{11}

\bar{1}

], and found that as t is in the range of 140–500 μm, thinner [

21 \bar{1}

] and [5

\bar{11}

\bar{1}

] specimens have a shorter N f .…”

Section: Introductionmentioning

confidence: 99%

Thickness‐Dependent Tensile and Fatigue Behavior of A Single‐Slip‐Oriented Cu Single Crystal

Liu

Yan

Han

et al. 2017

Crystal Research and Technology

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To explore the micro-mechanism for the size effect of the mechanical behavior of metallic crystals, the tensile and fatigue behavior of [345] Cu single crystal with t of 0.1−2.0 mm is investigated. The results show that with the reduction of t, an obvious increase in σ YS and a slight decrease in σ UTS take place; meanwhile, the δ evidently reduces, especially as t < 0.6 mm, while the N f first sharply increases and then decreases at a constant stress amplitude of 80 MPa. The activated slip system reduces with t under tensile loading, and the fracture modes are transferred from ductile to slip separation rupture, whereas under cyclic loading, slip separation rupture becomes dominant especially at t = 2.0 and 0.1 mm. Correspondingly, the tensile microstructures are transformed from the cell-walls to dislocation cells, while dislocation cells are the dominant microstructure in fatigued specimens, and the dislocation density obviously decreases with decreasing t. In a word, a strong dependence of tensile and fatigue behavior on t is exhibited for the [345] Cu single crystal.

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