Principles of equal-channel angular pressing as a processing tool for grain refinement

Valiev, Ruslan Z.; Langdon, Terence G.

doi:10.1016/j.pmatsci.2006.02.003

Cited by 3,915 publications

(2,399 citation statements)

References 399 publications

Supporting

Mentioning

1,777

Contrasting

Unclassified

Order By: Relevance

“…Generally, the materials fabricated by deposition are expected to contain relatively low-energy interfaces as the deposition processes are in near thermal equilibrium, while materials synthesized by SPD are expected to contain high-energy, 'thermally non-equilibrium' interfaces 49 . Consistent with this viewpoint, nanocrystalline Cu prepared by high-pressure torsion (HPT), a SPD process, suffers grain coarsening and decreases in hardness even at 50°C (ref.…”

Section: Resultsmentioning

confidence: 99%

High-strength and thermally stable bulk nanolayered composites due to twin-induced interfaces

Zheng

Beyerlein

Carpenter³

et al. 2013

Nat Commun

320

156

View full text Add to dashboard Cite

Bulk nanostructured metals can attribute both exceptional strength and poor thermal stability to high interfacial content, making it a challenge to utilize them in high-temperature environments. Here we report that a bulk two-phase bimetal nanocomposite synthesised via severe plastic deformation uniquely possesses simultaneous high-strength and high thermal stability. For a bimetal spacing of 10 nm, this composite achieves an order of magnitude increase in hardness of 4.13 GPa over its constituents and maintains it (4.07 GPa), even after annealing at 500°C for 1 h. It owes this extraordinary property to an atomically well-ordered bimaterial interface that results from twin-induced crystal reorientation, persists after extreme strains and prevails over the entire bulk. This discovery proves that interfaces can be designed within bulk nanostructured composites to radically outperform previously prepared bulk nanocrystalline materials, with respect to both mechanical and thermal stability.

show abstract

Section: Resultsmentioning

confidence: 99%

High-strength and thermally stable bulk nanolayered composites due to twin-induced interfaces

Zheng

Beyerlein

Carpenter³

et al. 2013

Nat Commun

320

156

View full text Add to dashboard Cite

show abstract

“…During ECAP processing, boundaries with relatively low misorientation are formed by dislocations rearrangement at lower strain (dislocation cells substructure), which are progressively transformed to higher angle grain boundaries at higher strains [5,14,15]. At the * corresponding author; e-mail: andrea.kovacova@tuke.sk same time ductility remains good for such heavily deformed Cu alloys [16].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Severe Plastic Deformation and Heat Treatment on CuCrZr Alloys

et al. 2017

View full text Add to dashboard Cite

CuCrZr alloy was subjected to equal channel angular pressing method, belonging to the severe plastic deformation group, followed by heat treatment under different ageing conditions to optimize mechanical properties of the alloy. Before equal channel angular pressing, CuCrZr alloy was treated by solution annealing at temperature 1020 • C for 1 h. Afterwards, samples were pressed through an equal channel angular pressing die once at room temperature and subjected to artificial ageing under different conditions (200, 400, 450, 480 • C for 30, 60, 90, 120, 150 min). Optimization of the CuCrZr alloy was done through the study of mechanical properties and microhardness as a function of ageing temperature and time considering the progress in microstructural/substructural features.

show abstract

“…ECAP and HPT are performed under high applied pressures and at low temperatures 1,2 . In the ECAP process, a well-lubricated billet is pressed in a die comprising two channels intersecting at a constant angle.…”

Section: Introductionmentioning

confidence: 99%

An Investigation on the Deformation Heating in Billet and Die During Equal-Channel Angular Pressing and High-Pressure Torsion

Karami

2016

Mat. Res.

View full text Add to dashboard Cite

This work aims to investigate the temperature rise in Aluminum alloy 6061 due to deformation heating in equal channel angular pressing (ECAP) and high-pressure torsion (HPT) processes using finite element method. The roles of various parameters are investigated and the heating of ECAP die due to billet deformation is included in the simulations. The results show that while the work-piece moves in the exit channel, the generated heat is transferred to die via conduction and therefore the temperature isosurfaces in die are extended in the direction of inlet and exit channels. The dependency of maximum work-piece temperature to velocity is more than its dependency to friction. Increasing the plunger velocity increases the difference between maximum and minimum temperatures. Additionally, the maximum work-piece temperature is attained at the deformation zone. The temperature rise in HPT is less than ECAP due to the small size of the HPT work-piece compared to ECAP. Not only the work-piece size, but also the good heat conduction of aluminum makes the temperature distribution roughly uniform in HPT.

show abstract

Principles of equal-channel angular pressing as a processing tool for grain refinement

Cited by 3,915 publications

References 399 publications

High-strength and thermally stable bulk nanolayered composites due to twin-induced interfaces

High-strength and thermally stable bulk nanolayered composites due to twin-induced interfaces

The Effect of Severe Plastic Deformation and Heat Treatment on CuCrZr Alloys

An Investigation on the Deformation Heating in Billet and Die During Equal-Channel Angular Pressing and High-Pressure Torsion

Contact Info

Product

Resources

About