Interface and colony boundary sliding as a deformation mechanism in a novel titanium alloy

2020 ◽  
Vol 178 ◽  
pp. 418-421 ◽  
Author(s):  
Zachary Kloenne ◽  
Gopal Viswanathan ◽  
Stephen Fox ◽  
Michael Loretto ◽  
Hamish L. Fraser
Keyword(s):  
Titanium Alloy ◽  
Deformation Mechanism ◽  
Colony Boundary ◽  
Boundary Sliding

scholarly journals Hot Deformation Behavior and Processing Maps of a New Ti-6Al-2Nb-2Zr-0.4B Titanium Alloy

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2456
Author(s):  
Zhijun Yang ◽  
Weixin Yu ◽  
Shaoting Lang ◽  
Junyi Wei ◽  
Guanglong Wang ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Flow Stress ◽  
Constitutive Equation ◽  
Deformation Mechanism ◽  
Power Dissipation ◽  
Hot Deformation ◽  
Dissipation Rate ◽  
Dynamic Recovery ◽  
Processing Maps ◽  
Temperature Range

The hot deformation behaviors of a new Ti-6Al-2Nb-2Zr-0.4B titanium alloy in the strain rate range 0.01–10.0 s−1 and temperature range 850–1060 °C were evaluated using hot compressing testing on a Gleeble-3800 simulator at 60% of deformation degree. The flow stress characteristics of the alloy were analyzed according to the true stress–strain curve. The constitutive equation was established to describe the change of deformation temperature and flow stress with strain rate. The thermal deformation activation energy Q was equal to 551.7 kJ/mol. The constitutive equation was ε ˙=e54.41[sinh (0.01σ)]2.35exp(−551.7/RT). On the basis of the dynamic material model and the instability criterion, the processing maps were established at the strain of 0.5. The experimental results revealed that in the (α + β) region deformation, the power dissipation rate reached 53% in the range of 0.01–0.05 s−1 and temperature range of 920–980 °C, and the deformation mechanism was dynamic recovery. In the β region deformation, the power dissipation rate reached 48% in the range of 0.01–0.1 s−1 and temperature range of 1010–1040 °C, and the deformation mechanism involved dynamic recovery and dynamic recrystallization.

Research on Micro-Mechanism of Nanocomposite Ceramic in Two-Dimensional Ultrasound Grinding

2007 ◽  
Vol 359-360 ◽  
pp. 344-348 ◽  
Author(s):  
Bo Zhao ◽  
Yan Wu ◽  
Guo Fu Gao ◽  
Feng Jiao
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Deformation Mechanism ◽  
Ground Surface ◽  
Grain Boundary Sliding ◽  
Second Phase ◽  
Two Dimensional ◽  
Composite Ceramics ◽  
Nano Composite ◽  
Boundary Sliding

Surface microstructure of nano-composite ceramics prepared by mixed coherence system and machined by two-dimensional ultrasonic precision grinding was researched using TEM, SEM, XRD detector and other equipments. Structure, formation mechanism and characteristic of metamorphic layer of ground surface of nano-composite ceramics were researched. The experiment shows micro deformation mechanism of ceramic material in two-dimensional ultrasound grinding is twin grain boundary and grain-boundary sliding for Al2O3, and it is crystal dislocation of enhanced phase, matrix grain boundary sliding, coordination deformation of intergranular second phase as well as its deformation mechanism for nano-composite ceramics. The fracture surfaces of nano-composite materials with different microscopic structure were observed using TEM and SEM. Research shows that ZrO2 plays an important influence on the generation and expansion of crack, and enhances the strength of grain boundaries. When grain boundaries is rich in the ZrO2 particles, the crack produced in grinding process will be prevented, and the surface with plastic deformation will be smooth. The results shows nanoparticles dispersed in grain boundary prevents crack propagation and makes materials fracture transgranularly which makes the processed surface fine.

Hot deformation mechanism and microstructure evolution of a new near β titanium alloy

2013 ◽  
Vol 584 ◽  
pp. 121-132 ◽  
Author(s):  
J.K. Fan ◽  
H.C. Kou ◽  
M.J. Lai ◽  
B. Tang ◽  
H. Chang ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Microstructure Evolution ◽  
Deformation Mechanism ◽  
Hot Deformation

Ex-situ study on mechanical properties and deformation mechanism of three typical microstructures in TA19 titanium alloy

2020 ◽  
Vol 167 ◽  
pp. 110521 ◽  
Author(s):  
Yu Zhou ◽  
Ke Wang ◽  
Zhibing Yan ◽  
Renlong Xin ◽  
Shizhong Wei ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Deformation Mechanism ◽  
Ex Situ

Effect of phase stability on deformation mechanism of β titanium alloy

2018 ◽  
Vol 2018.26 (0) ◽  
pp. 414
Author(s):  
Shuki YONEMURA ◽  
Takuya KIMURA ◽  
Shigeru KURAMOTO ◽  
Eri NAKAGAWA ◽  
Takahito OHMURA
Keyword(s):  
Titanium Alloy ◽  
Phase Stability ◽  
Deformation Mechanism

Research on Surface Microstructures of Nanocomposite Ceramics in Two-Dimensional Ultrasonic Ultraprecision Grinding

2007 ◽  
Vol 364-366 ◽  
pp. 909-913 ◽  
Author(s):  
Bo Zhao ◽  
Jing Lin Tong ◽  
Yan Wu ◽  
Guo Fu Gao
Keyword(s):  
Grain Boundary ◽  
Deformation Mechanism ◽  
Grain Boundary Sliding ◽  
Nano Particles ◽  
Surface Generation ◽  
Second Phase ◽  
Two Dimensional ◽  
Boundary Sliding ◽  
Microscopic Deformation ◽  
Surface Microstructures

Using TEM, SEM and XRD, the surface microstructures of nanocomposite ceramics prepared by heterocoagulation was studied in two-dimensional ultraprecision grinding with ultrasonic assistance. This research was focused on the structure of ground surface degenerating layer, surface generation mechanism and characteristics of nanocomposite ceramic parts. The experimental results showed that the microscopic deformation mechanism of the ordinary Al2O3 parts was grain- boundary twinning and grain-boundary sliding while microscopic deformation mechanism of nanophase ceramic parts was the inner crystal dislocation of strengthened phase with intragranular structure. And its deformation coordination mechanisms were the grain-boundary sliding and coordination deformation of intercrystalline second-phase. The observation on the fracture surfaces of nanocomposite materials with different microscopic structures by TEM and SEM showed that ZrO2 particles had an important effect on the generation and expansion of crack in ceramic parts. The introduction of ZrO2 particles strengthened the interface intensity of grain boundary. If there were rich ZrO2 particles on the grain boundary, the cracks generated during the grinding process would be prevented. Smooth and plastic deformation processing surface was obtained. It was proved further that the nanophase materials behaved transcrystalline fracture due to the nano particles, dispersed in the grain boundary and prevented the expansion of crack. This material’s fracture behavior made favorable surface possible. In the precise grinding of nano materials, the plastic removal mechanism dominated the process. The dislocated depth of the nanocomposite ceramics after grinding was bigger than that of common ceramics, which meant that dislocation increased.

Structural Observation of Twinning Deformation Mechanism in a Ti-Ta-Nb Alloy

2012 ◽  
Vol 188 ◽  
pp. 46-51 ◽  
Author(s):  
Vasile Danut Cojocaru ◽  
Doina Raducanu ◽  
Thiery Gloriant ◽  
Emmanuel Bertrand ◽  
Ion Cinca
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Deformation Mechanism ◽  
Mechanical Processing ◽  
Micromechanical Testing

A Ti-25Ta-25Nb β-type titanium alloy was subjected to thermo-mechanical processing and testing with the aim to observe the twinning deformation mechanism. Data concerning the evolution of twinning versus stress was obtained by SEM and micromechanical testing. Mechanical properties of the investigated alloy were also evaluated

Deformation mechanism of metastable titanium alloy showing stress-induced α′-Martensitic transformation

2019 ◽  
Vol 782 ◽  
pp. 427-432 ◽  
Author(s):  
Sang Won Lee ◽  
Jeong Mok Oh ◽  
Chan Hee Park ◽  
Jae-Keun Hong ◽  
Jong-Taek Yeom
Keyword(s):  
Titanium Alloy ◽  
Martensitic Transformation ◽  
Deformation Mechanism

The Compressive Behaviors of the Mg-Zn-Er Alloy Containing I-Phase

2015 ◽  
Vol 1088 ◽  
pp. 227-232
Author(s):  
Ke Liu ◽  
Wen Bo Du ◽  
Zhao Hui Wang ◽  
Shu Bo Li
Keyword(s):  
High Temperature ◽  
Grain Boundary ◽  
Deformation Mechanism ◽  
Basal Plane ◽  
Volume Fraction ◽  
Cast Alloy ◽  
Grain Boundary Sliding ◽  
Moderate Temperature ◽  
Boundary Sliding ◽  
Main Deformation

The microstructure and compressive behaviors of the Mg-Zn-Er alloy reinforced by I-phase were investigated. The XRD results suggested that the as-cast alloy was composed of -Mg and I-phase. During compress test, the deformation mechanism was depended on the test temperature and strain. It indicated that basal plane slip played an important role in deformation at both low and high temperature. However, the main deformation mechanism of the as-cast alloy includes grain boundary sliding and twins forming at the strain of 20% at a moderate temperature (225oC) besides the basal plane slip. Moreover, the DRX occurred at the moderate temperature after the strain of 50%. At high temperature (more than 300oC), the cavity was present, and the volume fraction of the cavities increases with the temperature increasing. At the high temperature, the deformation mechanism of the as-cast alloy is mainly dislocation sliding and climbing.

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