Deformation Behavior of Natural Wood Having Hierarchical Structure Under A Compression State

2011 ◽  
Vol 1304 ◽  
Author(s):  
Tsunehisa MIKI ◽  
Hiroyuki SUGIMOTO ◽  
Kozo KANAYAMA
Keyword(s):  
Plastic Deformation ◽  
Flow Stress ◽  
Hierarchical Structure ◽  
Deformation Behavior ◽  
Elevated Temperatures ◽  
Longitudinal Direction ◽  
Metallic Materials ◽  
The Hierarchical Structure ◽  
Natural Wood ◽  
Shear Flow Stress

ABSTRACTA large deformation of bulk wood using slipping between the wood cells has been found just like a plastic deformation generated by slip band in metallic materials. This phenomenon is caused by the hierarchical structure of the wood cell, and the intercellular layer becomes selectively softened in moistened states of wood. In such conditions, bulk wood subject to compression at elevated temperatures can easily be deformed perpendicular to the longitudinal direction of the cells by shear flow stress after being collapsed.

Compressive Deformation Behavior of the SiCw/AZ91 Composite at Elevated Temperatures

2005 ◽  
Vol 488-489 ◽  
pp. 783-786
Author(s):  
S.B. Li ◽  
Wei Min Gan ◽  
Ming Yi Zheng ◽  
Kun Wu
Keyword(s):  
Flow Stress ◽  
Deformation Behavior ◽  
Elevated Temperatures ◽  
Deformation Mode ◽  
Az91 Alloy ◽  
Strain Rates ◽  
Dominant Mechanism ◽  
Compression Direction ◽  
Initial Stage ◽  
Compressive Flow

Compressive behaviors of SiCw/AZ91composite and AZ91 alloy were investigated at temperatures from 423 K to 723 K and strain rates from 0.002 s-1 to 0.25 s-1. Microstructure evolutions after compressed at 623 K and 0.01 s-1 were observed by SEM and TEM. Results showed that compressive flow stress decreased with the increase of temperature; whiskers were broken and redistributed to the direction normal to the compression direction. At the initial stage of compression, dislocation sliding is the mainly deformation mode for the composite, while for AZ91 alloy, twining was the dominant mechanism.

scholarly journals Temperature dependence of elastic and plastic deformation behavior of a refractory high-entropy alloy

2020 ◽  
Vol 6 (37) ◽  
pp. eaaz4748 ◽  
Author(s):  
Chanho Lee ◽  
George Kim ◽  
Yi Chou ◽  
Brianna L. Musicó ◽  
Michael C. Gao ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Neutron Diffraction ◽  
Deformation Behavior ◽  
Elevated Temperatures ◽  
High Entropy ◽  
Plastic Deformation Behavior ◽  
Deformation Behaviors ◽  
In Situ Neutron Diffraction ◽  
Elastic And Plastic Deformation

Single-phase solid-solution refractory high-entropy alloys (HEAs) show remarkable mechanical properties, such as their high yield strength and substantial softening resistance at elevated temperatures. Hence, the in-depth study of the deformation behavior for body-centered cubic (BCC) refractory HEAs is a critical issue to explore the uncovered/unique deformation mechanisms. We have investigated the elastic and plastic deformation behaviors of a single BCC NbTaTiV refractory HEA at elevated temperatures using integrated experimental efforts and theoretical calculations. The in situ neutron diffraction results reveal a temperature-dependent elastic anisotropic deformation behavior. The single-crystal elastic moduli and macroscopic Young’s, shear, and bulk moduli were determined from the in situ neutron diffraction, showing great agreement with first-principles calculations, machine learning, and resonant ultrasound spectroscopy results. Furthermore, the edge dislocation–dominant plastic deformation behaviors, which are different from conventional BCC alloys, were quantitatively described by the Williamson-Hall plot profile modeling and high-angle annular dark-field scanning transmission electron microscopy.

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