Thermal stability of hafnium bronze subjected to dynamic channel angular pressing

Evolution of structure and properties of Ni under severe plastic deformation by equal-channel angular pressing (ECAP) and dynamic channel-angular pressing (DCAP) has been studied by transmission and scanning electron microscopy and microhardness measurements, and the differences in formation of submicrocrystalline structure under different deformation techniques have been revealed. The thermal stability of structure obtained by these methods is compared. It is demonstrated that under the DCAP processing the material is strengthened faster, by lesser number of passes, and microstructure’s thermal stability is somewhat lower after ECAP compared to that after DCAP, although after equal number of passes ECAP results in a more homogeneous microstructure.

Download Full-text

Nanostructuring of Ni by Various Modes of Severe Plastic Deformation

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.354.109 ◽

2014 ◽

Vol 354 ◽

pp. 109-119 ◽

Cited By ~ 4

Author(s):

Vladimir V. Popov ◽

E.N. Popova ◽

D.D. Kuznetsov ◽

A.V. Stolbovsky ◽

E.V. Shorohov ◽

...

Keyword(s):

Thermal Stability ◽

Plastic Deformation ◽

Severe Plastic Deformation ◽

Cryogenic Temperature ◽

High Pressure Torsion ◽

Nanocrystalline Structure ◽

Deformation Bands ◽

Angular Pressing ◽

Dynamic Channel Angular Pressing ◽

Thermal Stability Of

Various modes of severe plastic deformation (SPD), such as high-pressure torsion (HPT) at cryogenic temperature, equal channel angular pressing (ECAP) and dynamic channel-angular pressing (DCAP), have been applied for nanostructuring of Ni, and the thermal stability of the structure obtained has been studied. The nanocrystalline structure with average grain sizes of 80 nm and the microhardness of 6200 MPa is produced by HPT in liquid nitrogen. DCAP and ECAP result in the submicrocrystalline structure of a mixed type, with ultra-fine grains separated by high-angle boundaries along with deformation bands and coarse cells with low-angle dislocation boundaries. The thermal stability of the structures obtained by ECAP and DCAP is approximately the same, and it is higher than after the HPT at cryogenic temperature.

Download Full-text

Numerical simulation of dynamic channel-angular pressing of copper specimens

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/177/1/012056 ◽

2017 ◽

Vol 177 ◽

pp. 012056 ◽

Cited By ~ 1

Author(s):

A S Bodrov ◽

S A Zelepugin

Keyword(s):

Numerical Simulation ◽

Angular Pressing ◽

Dynamic Channel Angular Pressing ◽

Dynamic Channel

Download Full-text

Thermal Stability of Mechanical Properties of Copper after Equal-Channel Angular Pressing

Materials Science Forum ◽

10.4028/www.scientific.net/msf.584-586.960 ◽

2008 ◽

Vol 584-586 ◽

pp. 960-965 ◽

Cited By ~ 1

Author(s):

Tamara Kravchenko ◽

Alexander Korshunov ◽

Natalia Zhdanova ◽

Lev Polyakov ◽

Irina Kaganova

Keyword(s):

Mechanical Properties ◽

Thermal Stability ◽

Tensile Strength ◽

Chemical Composition ◽

Yield Strength ◽

Equal Channel Angular Pressing ◽

Angular Pressing ◽

Different Temperatures ◽

Thermal Stability Of

Annealed oxygen-free and tough-pitch copper samples have been processed by equalchannel angular pressing (ECAP) by route BC. The samples included 8 x 8 mm section pieces and a 40 mm diameter bar. Thermal stability was assessed based on the changes in the standard mechanical properties (conventional yield strength, tensile strength, elongation, proportional elongation and contraction) after annealing at different temperatures for 1 hour. Thermal stability of the same grade of material has been found to be different for different batches and to depend on the structural conditions of deformed material. The zone of thermal stability for copper of the two grades of interest does not depend on the material’s chemical composition.

Download Full-text