Plasticity Characteristics of Beta Titanium Alloy Obtained Using Depth-Sensing Nano-Indentation Test

2007 ◽  
Vol 340-341 ◽  
pp. 571-576
Author(s):  
Xiao Teng Wang ◽  
Fusahito Yoshida ◽  
Hong Yuan Fang
Keyword(s):  
Titanium Alloy ◽  
Strain Rate ◽  
Indentation Test ◽  
Beta Titanium Alloy ◽  
Depth Sensing ◽  
Softening Effect ◽  
Nano Indentation ◽  
Beta Titanium ◽  
Pile Up ◽  
Indentation Strain

In this study, depth sensing nano-indentation test was carried out to investigate the plastic/viscoplastic behavior of beta titanium alloy. The indentation experiment results showed that both hardening and softening effect existed in indentation process and the residual penetration depth was deeper when the nominal indentation strain rate increased. That is opposite to the room temperature tension test results, which showed a strain rate hardening behavior. FEM simulation combined with viscoplastic model was carried out to simulate the indentation procedure. FEM results showed that the pile-up pattern changed with the consideration of the nominal indentation strain rate effect. Atom force microscope (AFM) observation gave a same result of pile-up patterns.

In Situ AFM Observation of Mechanical Behavior of Beta Titanium Alloy in Nano-Indentation Test

2007 ◽  
Vol 546-549 ◽  
pp. 1389-1392
Author(s):  
Xiao Teng Wang ◽  
Hong Yuan Fang ◽  
Fusahito Yoshida
Keyword(s):  
Titanium Alloy ◽  
Strain Rate ◽  
Indentation Test ◽  
Plastic Behavior ◽  
Beta Titanium Alloy ◽  
Depth Sensing ◽  
Softening Behavior ◽  
Beta Titanium ◽  
Indentation Strain

In this study, depth sensing nano-indntation test combined with in-situ atom force microscope (AFM) is carried out to investigate the plastic/viscoplastic behavior of beta titanium alloy. The indentation experiment results show that with the increasing nominal indentation strain rate, the hardening effect becomes stronger in the loading part, while the creep induced softening behavior becomes stronger in the unloading part. The residual penetration depth is deeper when the indentation strain rate increases. A new quantity named nominal hardness/modulus ratio is defined to characterize the plastic behavior of beta titanium at micro region.

Thermal Deformation Behavior of a New Metastable Beta Titanium Alloy

2021 ◽  
Vol 1035 ◽  
pp. 32-38
Author(s):  
Jing Li ◽  
Xin Nan Wang ◽  
Zhi Shou Zhu
Keyword(s):  
Titanium Alloy ◽  
Strain Rate ◽  
Deformation Behavior ◽  
Thermal Deformation ◽  
Phase Region ◽  
Hot Compression ◽  
Beta Titanium Alloy ◽  
Experimental Conditions ◽  
Beta Titanium ◽  
Metastable Beta

The thermal deformation behavior of a new metastable beta titanium alloy composed of Ti-Al-Mo-V-Nb-Cr was studied under different experimental conditions of varying temperatures (760°C~ 970°C) and strain rates (0.001s−1, 0.01s−1, 0.1s−1, 1s−1 and 10s−1) up to deformation amount of 60%. The hot compression experiments were completed on a Gleeble-3500 thermal analogue. The experimental results showed that the true stress of the Ti-Al-Mo-V-Nb-Cr titanium alloy decreased with increasing the temperature and decreasing the strain rate, the stress peaks and the steady-state stress values were higher with the decreasing of temperature at the same strain rate. The calculated values of the deformation activation energy were 187.87 kJ/mol in the two-phase region and 165.17kJ/mol in beta single-phase region. The corresponding constitutive equation was determined by the multiple linear regression calculation on the hot compression experimental data, on the base of Arrhenius equations.

Microstructure and Texture in an Alpha/Beta Titanium Alloy and their Impact on Mechanical Response

2007 ◽  
Vol 539-543 ◽  
pp. 3589-3594
Author(s):  
W.J. Evans ◽  
F.R. Eng
Keyword(s):  
Titanium Alloy ◽  
Strain Rate ◽  
Titanium Alloys ◽  
Plane Strain ◽  
Basal Plane ◽  
Mechanical Response ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Strain And Strain Rate ◽  
Alpha Beta

The paper explores texture in the titanium alloys Ti-6-4 and Ti 550. It illustrates how texture evolves under plane strain compression in Ti-6-4. This evolution is dependent on temperature, degree of reduction (strain) and strain rate. Rolled (Ti-6-4) and forged (Ti 550) variants with different textures are then examined under tension and torsion loading in relation to their monotonic and fatigue response. Correlation of the observations with regard to orientation of the basal plane is demonstrated.

A Study of High Temperature Viscoplastic Deformation of Beta Titanium Alloy Considering Yield-Point Phenomena

2009 ◽  
Vol 410-411 ◽  
pp. 177-185 ◽  
Author(s):  
Xiao Teng Wang ◽  
H. Hamasaki ◽  
M. Yamamura ◽  
R. Yamauchi ◽  
Takashi Maeda ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
High Temperature ◽  
Strain Rate ◽  
Yield Point ◽  
Continuous Flow ◽  
Dynamic Recovery ◽  
Rate Sensitivity ◽  
Strain Rates ◽  
Beta Titanium Alloy ◽  
Beta Titanium

In this paper, the high temperature, deformation behaviour of beta titanium alloy Ti-20V-4Al-1Sn sheet is studied by performing uniaxial tension experiments at three different strain rates at high temperatures of 700°C, 750°C and 800°C. The stress-strain curves for these temperatures show strain rate sensitivity, yield point phenomena and continuous flow, softening patterns. Microstructures of deformed specimens at several representative deformation stages and different strain rates are studied using an optical microscope. Dynamic recovery does not occur at the early stage of deformation including the yield-point and the subsequent yield drop regime, but it is activated at a large deformation stage, where it is affected by both strain rate and strain. A viscoplastic, constitutive model, based on the assumption of rapid dislocation multiplication, is proposed to describe such high temperature, yield-point phenomena. In this modelling, the softening effect due to dynamic recovery is also considered. The stress-strain responses, predicted by the constitutive model, well capture the yield-point phenomena, strain rate sensitivity and subsequent continuous flow, softening behaviour of the beta titanium alloy.

Strength and Toughness of a Metastable Beta-Titanium Alloy as Influenced by Strain Rate Variations

1976 ◽  
Vol 4 (5) ◽  
pp. 359 ◽  
Author(s):  
RL Meltzer ◽  
YR Fiorini ◽  
RT Horstman ◽  
IC Moore ◽  
AL Batik ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Strain Rate ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Metastable Beta ◽  
Strength And Toughness

Kink deformation in a beta titanium alloy at high strain rate

2017 ◽  
Vol 702 ◽  
pp. 218-224 ◽  
Author(s):  
Youping Zheng ◽  
Weidong Zeng ◽  
Yubo Wang ◽  
Saifei Zhang
Keyword(s):  
Titanium Alloy ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Beta Titanium Alloy ◽  
Beta Titanium
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