Martensitic transformation and metastable ß-phase in binary titanium alloys with β-metals of 4-6 periods

2003 ◽  
Vol 112 ◽  
pp. 723-726
Author(s):  
A. V. Dobromyslov ◽  
V. A. Elkin
Keyword(s):  
Martensitic Transformation ◽  
Titanium Alloys

Hydrogen Influence on Martensitic Transformation and Shape Memory Effect in Titanium Alloys

1995 ◽  
Vol 05 (C8) ◽  
pp. C8-1145-C8-1150
Author(s):  
A.A. Ilyin ◽  
M.Yu. Kollerov ◽  
A.M. Mamonov ◽  
A.A. Krastilevsky ◽  
D.Yu. Makarenkov
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory ◽  
Titanium Alloys ◽  
Shape Memory Effect ◽  
Memory Effect

Analysis on the Martensitic Transformation in the Ti-xNb Alloys Using a Phenomenological Theory

2007 ◽  
Vol 124-126 ◽  
pp. 1669-1672 ◽  
Author(s):  
Hi Won Jeong ◽  
Seung Eon Kim ◽  
Chang Yong Jo ◽  
Yong Tae Lee ◽  
Joong Kuen Park
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Martensitic Transformation ◽  
Shape Memory ◽  
Titanium Alloys ◽  
Martensitic Transformations ◽  
Phenomenological Theory ◽  
Transition Elements ◽  
Low Elastic Modulus ◽  
Diffraction Peaks

The titanium alloys containing the Nb transition elements have been investigated as the Ni-free shape memory and the biomedical alloys with a low elastic modulus. The mechanical properties of the alloys depended upon the meta-stable phases like the α`, α``, ω. To study the martensitic transformations from the β to α`` or α` the Ti-xNb (x=0 to 40 wt%) alloys were melted into the button type ingots using a VAR, and followed by the water-quenching after the soaking at 1000oC for 2hrs. The crystallography of the martensitic phases in the water-quenched alloys was analyzed using a XRD. The diffraction peaks of the orthorhombic martensites were identified by the crystallographic relationship with the bcc matrix. The lattice parameters of the orthorhombic martensites were varied continuously with the contents of the Nb elements. The martensitic transformations of the alloys were studied using the phenomenological theory of Bowles and Mackenzie.

Specific features of martensitic transformation in titanium alloys

1965 ◽  
Vol 7 (4) ◽  
pp. 233-238 ◽  
Author(s):  
S. G. Fedotov ◽  
E. P. Sinodova
Keyword(s):  
Martensitic Transformation ◽  
Titanium Alloys

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

2016 ◽  
Vol 687 ◽  
pp. 3-10 ◽  
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.

Effect of prior β grain size on the martensitic transformation of titanium alloys

2021 ◽  
pp. 111525
Author(s):  
Sang Won Lee ◽  
Hyeon Jin Lee ◽  
Jae Hyeok Kim ◽  
Chan Hee Park ◽  
Jae-Keun Hong ◽  
...  
Keyword(s):  
Grain Size ◽  
Martensitic Transformation ◽  
Titanium Alloys

Martensitic Transformation in Binary Titanium Alloys

JOM ◽  
1956 ◽  
Vol 8 (8) ◽  
pp. 1036-1040 ◽  
Author(s):  
Y. C. Liu
Keyword(s):  
Martensitic Transformation ◽  
Titanium Alloys

scholarly journals Local lattice strain around alloying element and martensitic transformation in titanium alloys

2020 ◽  
Vol 321 ◽  
pp. 11009
Author(s):  
M. Morinaga ◽  
H. Yukawa ◽  
M. Yoshino
Keyword(s):  
Martensitic Transformation ◽  
Titanium Alloys ◽  
Strain Energy ◽  
Lattice Strain ◽  
Extreme Case ◽  
Local Strain ◽  
Absolute Temperature ◽  
Lattice Strains ◽  
Local Lattice ◽  
First Time

Local strain is introduced into the lattice around solute atom due to the size mismatch between solute and solvent atoms in alloy. In this study, local lattice strains are calculated for the first time in titanium alloys, using the plane-wave pseudopotential method. As an extreme case, the local lattice strain around a vacancy is also calculated in various bcc, fcc and hcp metals. It is found that the local strain energy is very high in both bcc Ti and bcc Fe, where the martensitic transformation takes place. From a series of calculations, it is shown that the magnitude of the strain energy stored in the local lattice is comparable to the thermal energy, kBT, where kB is the Boltzmann constant and T is the absolute temperature. Therefore, the presence of local lattice strains in alloy could influence the phase stability that varies largely depending on temperatures. For example, the local lattice strain correlates with the martensitic transformation start temperature, Ms, in binary titanium alloys.

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