Significance of Microstructural Thermal Stability in an Al-2219 Alloy Processed by Severe Plastic Deformation

Evolution of structure of high-purity and commercially pure copper at severe plastic deformation (SPD) by high pressure torsion (HPT) at room temperature and in liquid nitrogen has been studied by transmission electron microscopy (TEM) and measurements of microhardness. Thermal stability of structure obtained by HPT has been investigated. Factors preventing from obtaining nanocrystalline structure in Cu are analyzed and possible ways of their overcoming are discussed.

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Long-time stability of metals after severe plastic deformation: Softening and hardening by self-annealing versus thermal stability

Materials Science and Engineering A ◽

10.1016/j.msea.2018.05.079 ◽

2018 ◽

Vol 729 ◽

pp. 340-348 ◽

Cited By ~ 14

Author(s):

Kaveh Edalati ◽

Yuki Hashiguchi ◽

Hideaki Iwaoka ◽

Hirotaka Matsunaga ◽

Ruslan Z. Valiev ◽

...

Keyword(s):

Thermal Stability ◽

Plastic Deformation ◽

Severe Plastic Deformation ◽

Time Stability ◽

Long Time ◽

Long Time Stability

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Biocomposites Produced from Hardwood Particles by Equal Channel Angular Pressing Without Additives

Journal of Composites Science ◽

10.3390/jcs3020036 ◽

2019 ◽

Vol 3 (2) ◽

pp. 36

Author(s):

Yu Bai ◽

Xiaoqing Zhang ◽

Kenong Xia

Keyword(s):

Thermal Stability ◽

Plastic Deformation ◽

Severe Plastic Deformation ◽

Equal Channel Angular Pressing ◽

Crack Formation ◽

Cell Deformation ◽

Processing Conditions ◽

Ongoing Research ◽

Angular Pressing ◽

Wood Particles

Equal channel angular pressing (ECAP) has been shown to be a promising method for producing biocomposites from wood particles. However, severe plastic deformation during ECAP would cause considerable cracking when consolidation is carried out without a binder. In this study, the processing conditions were investigated for ECAP of hardwood particles into bulk biocomposites without any additives. Crack formation and wood cell deformation were examined in conjunction with thermal stability and crystallinity of the biocomposites. In comparison with hot pressing without severe shearing, a decrease in crystallinity and severe deformation of wood cells occurred during ECAP. Improved processability and homogeneous deformation would occur at high ECAP temperature (e.g., 210 °C) or low ECAP speed (e.g., 10 mm/min), leading to reduced crack formation in the ECAP-produced biocomposites. Despite its tendency to cause periodic cracking, effective plastic deformation in the regions between cracks was shown to improve interparticle binding. Ongoing research points to the potential achievement of crack-free hardwood (HW) consolidated without a binder, leading to significantly enhanced strength.

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Structure and Properties of Grain Boundaries in Submicrocrystalline W Obtained by Severe Plastic Deformation

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.283-286.629 ◽

2009 ◽

Vol 283-286 ◽

pp. 629-638 ◽

Cited By ~ 16

Author(s):

Vladimir V. Popov ◽

Ruslan Valiev ◽

E.N. Popova ◽

A.V. Sergeev ◽

A.V. Stolbovsky ◽

...

Keyword(s):

Thermal Stability ◽

Plastic Deformation ◽

High Pressure ◽

Severe Plastic Deformation ◽

Grain Boundaries ◽

High Pressure Torsion ◽

Submicrocrystalline Structure ◽

Emission Mössbauer Spectroscopy ◽

Structure And Properties ◽

Initial State

Submicrocrystalline structure of W obtained by severe plastic deformation (SPD) by high pressure torsion (5 revolutions of anvils at 4000C) and its thermal stability have been examined by TEM. Grain boundaries of submicrocrystalline W have been studied by the method of the emission Mössbauer spectroscopy in the initial state and after annealing at 400-6000С.

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