<i>In situ</i> observation of fatigue behavior of single crystal copper micron-scale specimen under tension-compression cyclic loading

In situ, observation of twinning and detwinning in magnesium single crystals during tension-compression cyclic loading was made using optical microscopy. A quantitative analysis of plastic strain indicates that twinning and detwinning experience two stages, low and high work hardening de-twinning, and pure re-twinning and fresh twinning combined with retwinning. Slip is always activated. For the first time, inverse slip accompanying with pure retwinning and high work hardening detwinning was experimentally identified, which provides insights in better understanding of the activity of twining, detwinning, and slips.

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Correlation between Hardness and Fatigue Properties

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.662.197 ◽

2015 ◽

Vol 662 ◽

pp. 197-200 ◽

Cited By ~ 1

Author(s):

Pavol Zubko ◽

Ladislav Pešek

Keyword(s):

Cyclic Loading ◽

Fatigue Behavior ◽

Hardness Measurement ◽

Fatigue Properties ◽

Tensile Curve ◽

Static Tensile ◽

Static And Cyclic Loading ◽

Hardness Values ◽

Good Agreement

The contribution deals with estimation of tensile properties and fatigue behavior based on hardness measurement. First of all the database of tensile and fatigue properties vs. hardness data was created for a group of steels, from literature survey and performed experiments. Tensile strength, yield strength, ductility and parameters of Ludwig-Hollomon equation in static and cyclic loading were extracted and fitted in relation to the hardness HB. The experimental materials were API 5 L grade steels – X60 and X70 after different deformation exposition. Measured tensile curve (SC) and cyclic deformation curve (CDC) were compared with predicted curves. Hardness was measured in-situ during cyclic loading. The maximum possible hardness values were experimentally determined. The results give a good agreement between estimated and measured data of both static tensile test and fatigue properties.

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FE-SEM in situ observation of damage evolution in tension-compression fatigue of micro-sized single-crystal copper

Materials Science and Engineering A ◽

10.1016/j.msea.2019.138218 ◽

2019 ◽

Vol 764 ◽

pp. 138218 ◽

Cited By ~ 2

Author(s):

Takashi Sumigawa ◽

Shin Uegaki ◽

Tetsuya Yukishita ◽

Shigeo Arai ◽

Yoshimasa Takahashi ◽

...

Keyword(s):

Single Crystal ◽

Damage Evolution ◽

In Situ Observation ◽

Single Crystal Copper

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Direct observations of the sintering of silver nanoparticles on single crystal copper by in-situ uhv tem

MRS Proceedings ◽

10.1557/proc-501-283 ◽

1997 ◽

Vol 501 ◽

Cited By ~ 1

Author(s):

M. Yeadon ◽

J. C. Yang ◽

R. S. Averback ◽

J. W. Bullard ◽

J. M. Gibson

Keyword(s):

Silver Nanoparticles ◽

Electron Microscope ◽

Single Crystal ◽

Epitaxial Film ◽

Substrate Surface ◽

Silver Particles ◽

Single Crystal Copper ◽

Direct Observations ◽

Transmission Electron

ABSTRACTUsing a novel ultrahigh vacuum (UHV) transmission electron microscope with in-situ UHV sputtering attachment we have studied the sintering of copper and silver nanoparticles with single crystal copper substrates. Copper and silver particles deposited on (001) copper initially assume random orientations. Upon annealing, however, the particles reorient and assume an epitaxial orientation with the substrate. In the case of copper on copper, homoepitaxy occurs by a process involving sintering and grain growth. In the case of silver on copper, we have observed the particles to wet the substrate surface and sinter to form a thin epitaxial film with the orientation relationship (111)Ag // (001)Cu, [110]Ag // [110]Cu.

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