Formation of a submicrocrystalline structure in a two-phase titanium alloy without severe plastic deformation

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.

Download Full-text

The Role of Martensitic Transformation in Thermomechanical Development of Microstructure and Plasticity of Two-Phase Ti-6Al-4V Titanium Alloy

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.687.3 ◽

2016 ◽

Vol 687 ◽

pp. 3-10 ◽

Cited By ~ 1

Author(s):

Maciej Motyka ◽

Jan Sieniawski ◽

Waldemar Ziaja

Keyword(s):

Plastic Deformation ◽

Titanium Alloy ◽

Martensitic Transformation ◽

Titanium Alloys ◽

Thermomechanical Processing ◽

Solution Treatment ◽

Phase Morphology ◽

Two Phase ◽

Α Phase ◽

Hot Plasticity

Phase constituent morphology in microstructure of two-phase α+β titanium alloys is determined by conditions of thermomechanical processing consisting of sequential heat treatment and plastic deformation operations. Results of previous research indicate that particularly solution treatment preceding plastic deformation significantly changes α-phase morphology and determines hot plasticity of titanium alloys. In the paper thermomechanical processing composed of β solution treatment and following hot forging of Ti-6Al-4V titanium alloy was analysed. Development of martensite plates during heating up and hot deformation was evaluated. Microscopic examinations revealed that elongated and deformed α-phase grains were fragmented and transformed into globular ones. Significant influence of martensitic transformation on elongation coefficient of α-phase grains after plastic deformation was confirmed. Based on results of elevated temperature tensile tests it was established that α-phase morphology in examined two-phase α+β titanium alloy, developed in the thermomechanical processing, can enhance their hot plasticity – especially in the range of low strain rates.

Download Full-text

Multiscale two-phase Ti–Al with high strength and plasticity through consolidation of particles by severe plastic deformation

Scripta Materialia ◽

10.1016/j.scriptamat.2011.07.014 ◽

2011 ◽

Vol 65 (8) ◽

pp. 711-714 ◽

Cited By ~ 4

Author(s):

E.W. Lui ◽

W. Xu ◽

X. Wu ◽

K. Xia

Keyword(s):

Plastic Deformation ◽

Severe Plastic Deformation ◽

High Strength ◽

Two Phase ◽

Strength And Plasticity

Download Full-text

Formation of a submicrocrystalline structure in metastable austenitic steels during severe plastic deformation and subsequent heating

Russian Metallurgy (Metally) ◽

10.1134/s0036029516030095 ◽

2016 ◽

Vol 2016 (3) ◽

pp. 181-188

Author(s):

L. A. Mal’tseva ◽

T. V. Mal’tseva ◽

A. S. Yurovskikh ◽

G. I. Raab ◽

V. A. Sharapova ◽

...

Keyword(s):

Plastic Deformation ◽

Severe Plastic Deformation ◽

Submicrocrystalline Structure ◽

Austenitic Steels ◽

Subsequent Heating

Download Full-text

Structural Change in Ni-Fe-Ga Magnetic Shape Memory Alloys after Severe Plastic Deformation

Materials ◽

10.3390/ma12121939 ◽

2019 ◽

Vol 12 (12) ◽

pp. 1939 ◽

Cited By ~ 3

Author(s):

Gheorghe Gurau ◽

Carmela Gurau ◽

Felicia Tolea ◽

Vedamanickam Sampath

Keyword(s):

Electron Microscopy ◽

Plastic Deformation ◽

Severe Plastic Deformation ◽

Shape Memory Alloys ◽

Shape Memory ◽

High Speed ◽

High Pressure Torsion ◽

Magnetic Shape Memory ◽

Two Phase ◽

Ultrafine Grained

Severe plastic deformation (SPD) is widely considered to be the most efficient process in obtaining ultrafine-grained bulk materials. The aim of this study is to examine the effects of the SPD process on Ni-Fe-Ga ferromagnetic shape memory alloys (FSMA). High-speed high-pressure torsion (HSHPT) was applied in the as-cast state. The exerted key parameters of deformation are described. Microstructural changes, including morphology that were the result of processing, were investigated by optical and scanning electron microscopy. Energy-dispersive X-ray spectroscopy was used to study the two-phase microstructure of the alloys. The influence of deformation on microstructural features, such as martensitic plates, intragranular γ phase precipitates, and grain boundaries’ dependence of the extent of deformation is disclosed by transmission electron microscopy. Moreover, the work brings to light the influence of deformation on the characteristics of martensitic transformation (MT). Vickers hardness measurements were carried out on disks obtained by SPD so as to correlate the hardness with the microstructure. The method represents a feasible alternative to obtain ultrafine-grained bulk Ni-Fe-Ga alloys.

Download Full-text