Study on bifurcation behavior and morphology of the secondary grain boundary α phase in TC18 titanium alloy

2022 ◽  
pp. 163622
Author(s):  
Zhichao Sun ◽  
Lijiao Yin
Keyword(s):  
Titanium Alloy ◽  
Grain Boundary ◽  
Α Phase ◽  
Bifurcation Behavior

Evolution of grain boundary α phase during cooling from β phase field in a α+β titanium alloy

2021 ◽  
pp. 130318
Author(s):  
Xiongxiong Gao ◽  
Saifei Zhang ◽  
Kun Yang ◽  
Peng Wang
Keyword(s):  
Titanium Alloy ◽  
Grain Boundary ◽  
Phase Field ◽  
Β Phase ◽  
Α Phase

scholarly journals Improvement of the Crack Propagation Resistance in an α + β Titanium Alloy with a Trimodal Microstructure

Metals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1058
Author(s):  
Changsheng Tan ◽  
Yiduo Fan ◽  
Qiaoyan Sun ◽  
Guojun Zhang
Keyword(s):  
Plastic Deformation ◽  
Titanium Alloy ◽  
Grain Boundary ◽  
Crack Propagation ◽  
Crack Growth ◽  
Growth Mechanisms ◽  
Propagation Resistance ◽  
Crack Propagation Resistance ◽  
Α Phase ◽  
Electron Back Scattered Diffraction

The roles of microstructure in plastic deformation and crack growth mechanisms of a titanium alloy with a trimodal microstructure have been systematically investigated. The results show that thick intragranular α lath and a small number of equiaxed α phases avoid the nucleation of cracks at the grain boundary, resulting in branching and fluctuation of cracks. Based on electron back-scattered diffraction, the strain partition and plastic deformation ahead of the crack tip were observed and analyzed in detail. Due to the toughening effect of the softer equiaxed α phase at the grain boundary, crack arresting and blunting are prevalent, improving the crack growth resistance and generating a relatively superior fracture toughness performance. These results indicate that a small amount of large globular α phases is beneficial to increase the crack propagation resistance and, thus, a good combination of mechanical property is obtained in the trimodal microstructure.

ω-Assisted refinement of α phase and its effect on the tensile properties of a near β titanium alloy

2020 ◽  
Vol 44 ◽  
pp. 24-30 ◽  
Author(s):  
Ruifeng Dong ◽  
Jinshan Li ◽  
Hongchao Kou ◽  
Jiangkun Fan ◽  
Yuhong Zhao ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Tensile Properties ◽  
Α Phase

A new insight into the α phase precipitation in β titanium alloy

Vacuum ◽  
2021 ◽  
Vol 189 ◽  
pp. 110272
Author(s):  
Libo Zhou ◽  
Jinshan Sun ◽  
Ruizhi Zhang ◽  
Jian Chen ◽  
Jianjun He ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Phase Precipitation ◽  
Α Phase ◽  
Insight Into

The Effect of Isothermal Forging Process Parameters on the Microstructure and the Properties of TA15 Near α Titanium Alloy

2007 ◽  
Vol 26-28 ◽  
pp. 367-371
Author(s):  
Hong Zhen Guo ◽  
Zhang Long Zhao ◽  
Bin Wang ◽  
Ze Kun Yao ◽  
Ying Ying Liu
Keyword(s):  
Titanium Alloy ◽  
High Temperature ◽  
Tensile Properties ◽  
Process Parameters ◽  
Spherical Shape ◽  
Deformation Degree ◽  
Isothermal Forging ◽  
Forging Process ◽  
Α Phase ◽  
Strip Shape

In this paper the effect of isothermal forging process parameters on the microstructure and the mechanical properties of TA15 titanium alloy was researched. The results of the tests indicate that, in the range of temperature of 850 °C~980 °C and deformation degree of 20%~60%, with the increase of temperature or deformation, as the reinforcement of deformation recrystallization, the primary α-phase tends to the spherical shape and secondary α-phase transforms from the acicular shape to fine and spherical shape with disperse distribution, which enhance the tensile properties at room and high temperature. With the increment of forging times, the spheroidization of primary α-phase aggrandizes and secondary α-phase transforms from spherical and acicular shape to wide strip shape, which decrease the tensile properties at room and high temperature. The preferable isothermal forging process parameters are temperature of 980 °C, deformation degree of 60%, and few forging times.

Structure, Texture and Mechanical Properties through the Section of the Hot-Extruded Tube of Titanium Alloy PT-1M

2020 ◽  
Vol 989 ◽  
pp. 139-144 ◽  
Author(s):  
F.V. Vodolazskiy ◽  
N.A. Barannikova ◽  
Anatoly G. Illarionov
Keyword(s):  
Titanium Alloy ◽  
Extrusion Direction ◽  
Hot Extrusion ◽  
Tangential Direction ◽  
Primary Recrystallization ◽  
Recrystallization Temperature ◽  
Fine Grained ◽  
Surface Areas ◽  
Α Phase ◽  
Fine Grained Structure

The study considers the formation of the structure, texture, and hardness of hot extruded tube of titanium alloy PT-1M. It is shown that hot extrusion at 840 °C, which is higher than the α-phase recrystallization temperature, results to the development of dynamic and primary recrystallization processes and ensures the formation of homogeneous and fine-grained structure through-out the cross section with a two-component tangential texture (0001)TD<100>ED+(0001)TD<110>ED (TD – tangential direction, ED – extrusion direction) and hardness of 155 HV. It has been established that a higher cooling rate of the surface areas of the tube after extrusion results to a less active development of recrystallization processes, which lead to the formation of a finer granular structure near the outer surface. This weakens recrystallization component of (0001)TD<110>ED, compared to other areas of the tube.

Morphology transformation of primary strip α phase in hot working of two-phase titanium alloy

2017 ◽  
Vol 27 (6) ◽  
pp. 1294-1305 ◽  
Author(s):  
Xiao-guang FAN ◽  
He YANG ◽  
Peng-fei GAO ◽  
Rui ZUO ◽  
Peng-hui LEI ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Hot Working ◽  
Two Phase ◽  
Α Phase

Influence of Isothermal Forging Temperature on Microstructure and Tensile Properties of Ti-5.8Al-4.0Sn-4.0Zr-0.7Nb-0.4Si-1.5Ta Near-α Titanium Alloy

2010 ◽  
Vol 97-101 ◽  
pp. 153-157
Author(s):  
Tao Wang ◽  
Hong Zhen Guo ◽  
Jian Hua Zhang ◽  
Ze Kun Yao
Keyword(s):  
Grain Size ◽  
Tensile Strength ◽  
Titanium Alloy ◽  
Tensile Properties ◽  
Room Temperature ◽  
Volume Fraction ◽  
Constant Strain Rate ◽  
Isothermal Forging ◽  
Α Phase ◽  
Transus Temperature

The microstructures and room temperature and 600°C tensile properties of Ti-5.8Al-4.0Sn-4.0Zr-0.7Nb -0.4Si-1.5Ta alloy after isothermal forging have been studied. The forging temperature range was from 850°C to 1075°C, and the constant strain rate of 8×10-3/S-1 was adopted. With the increase of forging temperature, the volume fraction of primary α phase decreased and the lamellar α phase became thicker when the temperatures were in range of 850°C -1040°C; The grain size became uneven and the α phase had different forms when the forging temperature was 1040°C and 1075°C respectively; The tensile strength was not sensitive to the temperature and the most difference was within 20MPa. Tensile strength and yield strength attained to the maximum when temperature was 1020°C; the ductility decreased with the increase of forging temperature, and this trend became more obvious if forging temperature was above the β-transus temperature.

Spheroidization of α-Phase Grains in Quenched and Hot Deformed Ti-6Al-4V Titanium Alloy

2016 ◽  
pp. 443-447 ◽  
Author(s):  
Maciej Motyka ◽  
Krzysztof Kubiak ◽  
Jan Sieniawski ◽  
Waldemar Ziaja
Keyword(s):  
Titanium Alloy ◽  
Α Phase
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