Study of the heat treatment influence on the formation of nanostructured state in bulk titanium nickelide alloys subjected to severe plastic deformation

The effects of severe plastic deformation (SPD) by isothermal rolling at the temperature of liquid nitrogen combined with prior- and post-SPD heat treatment, on microstructure and hardness of Al-4.4%Cu-1.4%Mg-0.7%Mn (D16) alloy were investigated. It was found no nanostructuring even after straining to 75%. Сryodeformation leads to microshear banding and processing the high-density dislocation substructures with a cell size of ~ 100-200 nm. Such a structure remains almost stable under 1 hr annealing up to 200oC and with further temperature increase initially transforms to bimodal with a small fraction of nanograins and then to uniform coarse grained one. It is found the change in the alloy post–SPD aging response leading to more active decomposition of the preliminary supersaturated aluminum solid solution, and to the alloy extra hardening under aging with shorter times and at lower temperatures compared to T6 temper.

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

Acta Physica Polonica A ◽

10.12693/aphyspola.131.1336 ◽

2017 ◽

Vol 131 (5) ◽

pp. 1336-1340 ◽

Cited By ~ 2

Author(s):

A. Kováčová ◽

T. Kvačkaj ◽

R. Kočiško ◽

L. Dragošek ◽

L. Lityńska-Dobrzyńska

Keyword(s):

Heat Treatment ◽

Plastic Deformation ◽

Severe Plastic Deformation ◽

Deformation And Heat Treatment

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The Influence of Severe Plastic Deformation Process on Structure and Properties of AZ 31 Alloy after Selected Heat Treatment

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.275.134 ◽

2018 ◽

Vol 275 ◽

pp. 134-146

Author(s):

Stanislav Rusz ◽

Ondřej Hilšer ◽

Stanislav Tylšar ◽

Lubomír Čížek ◽

Tomasz Tański ◽

...

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Plastic Deformation ◽

Severe Plastic Deformation ◽

Structure Refinement ◽

Hardness Measurement ◽

Az31 Alloy ◽

Strength Properties ◽

Aviation Industry ◽

Initial State

The technology of structure refinement in materials with the aim of achieving substantial mechanical properties and maintaining the required plasticity level is becoming increasingly useful in industrial practice. Magnesium alloys are very progressive materials for utilization in practice thanks to their high strength-to-weight ratios (tensile strength/density). The presented paper analyses the effect of the input heat treatment of the AZ31 alloy on the change of structure and strength properties through the process of severe plastic deformation (SPD), which finds an increasing utilization, especially in the automotive and aviation industry. For the study of the influence of the SPD process (ECAP method) on the properties of the AZ31 alloy, two types of thermal treatment of the initial state of the structure were selected. The analysis of the structure of the AZ31 alloy was performed in the initial state without heat treatment and subsequently after heat treatment. In the next part, the influence of the number of passes on the strengthening curves was evaluated. Mechanical properties of the AZ31 alloy after ECAP were evaluated by hardness measurement and completed by structure analysis.

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Magnetic Properties of Nanocrystalline (Nd,R)-(Fe,Co)-B (R = Pr, Ho) Alloys after Melt Spinning, Severe Plastic Deformation and Heat Treatment

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.312.235 ◽

2020 ◽

Vol 312 ◽

pp. 235-243

Author(s):

Lev Aleksandrovich Ivanov ◽

Tatiana P. Kaminskaya ◽

Irina Semenovna Tereshina ◽

Vladislav Davydov ◽

Vladimir V. Popov ◽

...

Keyword(s):

Heat Treatment ◽

Plastic Deformation ◽

Severe Plastic Deformation ◽

Melt Spinning ◽

Magnetic Hysteresis ◽

Hysteresis Loops ◽

Nanocrystalline State ◽

Force Microscopy ◽

Atomic Force ◽

Deformation And Heat Treatment

Magnetic force microscopy (MFM) and magnetometry, scanning electron microscopy (SEM) and atomic force microscopy (AFM) are used to study the magnetic and structural properties of the (Nd,Pr)-Fe–B and (Nd,Ho)-(Fe,Co)-B alloys. The alloys are synthesized using an arc or induction furnaces. The nanocrystalline state of the (Nd,Ho)-(Fe,Co)-B alloys is reached by two techniques, namely, melt spinning (MS) and severe plastic deformation (SPD). Hydrogenation and multistage treatment of (Nd,Ho)-(Fe,Co)-B alloys, which includes severe plastic deformation of melt-quenched ribbons and subsequent heat treatment, is also used. The surface morphology and domain structure of samples are studied. These pictures are used to interpret the observed magnetic hysteresis loops of the samples. It was found that multistage treatment allows one to obtain samples with higher values of coercivity due to the formation of a special microstructure with oval grain (the aspect ratio equal to ∼ 3).

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