Loading rate and holding load dependent room temperature nanoindentation creep behavior of 60NiTi alloy: individual and coupling effects

Commercial pure titanium (CP-Ti) is an attractive material, due to its good properties such as high strength, high specific work hardening ability, excellent plasticity, toughness, corrosion resistance and weld ability. It is commonly used in pressure vessels, such as heat exchangers, pumps, valves and so on. It has been reported that the room temperature creep has a great influence on the failure of titanium pressure vessel. In this paper, in order to investigate room temperature creep behavior and its effect on tensile properties of CP-Ti, both creep and tensile experiments were carried out. According to creep experiment results, CP-Ti shows strong stress dependent creep behavior at the creep stress higher than 305MPa. On the contrary, the strong loading rate dependent creep behavior occurs at the creep stress lower than 305MPa. Besides, creep strain of CP-Ti can be reduced by pretension. As pretension reaches 6%, creep behavior of CP-Ti is completely suppressed at the creep stress of 320MPa. Subsequent tensile test results show that the occurrence of room temperature creep obviously enhances the strength of CP-Ti. With the increase of creep strain and loading rate in previous creep tests, the yield strength and tensile strength of CP-Ti increase.

Download Full-text

Multi-scale indentation creep behavior in Fe-based amorphous/nanocrystalline coating at room temperature

Materials Letters ◽

10.1016/j.matlet.2020.128768 ◽

2021 ◽

Vol 283 ◽

pp. 128768

Author(s):

Anil Kumar ◽

Sapan Kumar Nayak ◽

Atanu Banerjee ◽

Tapas Laha

Keyword(s):

Creep Behavior ◽

Room Temperature ◽

Indentation Creep ◽

Nanocrystalline Coating ◽

Multi Scale

Download Full-text

Enhanced Room Temperature Magnetoelectric Coupling Effects in c ‐axis Oriented Polycrystalline BaSrCo 2‐ x Mg x Fe 11 AlO 22

Journal of the American Ceramic Society ◽

10.1111/jace.17717 ◽

2021 ◽

Author(s):

Xing‐Han Chen ◽

Kun Zhai ◽

Guo‐Yu Qian ◽

Qing‐Shan Fu ◽

Chiranjib Chakrabarti ◽

...

Keyword(s):

Room Temperature ◽

Magnetoelectric Coupling ◽

Coupling Effects ◽

Oriented Polycrystalline

Download Full-text

Effect of loading rate on creep behavior and shear transformation zone in amorphous alloy thin films, and its correlation with deformation mode transition

Thin Solid Films ◽

10.1016/j.tsf.2019.04.050 ◽

2019 ◽

Vol 681 ◽

pp. 23-31 ◽

Cited By ~ 1

Author(s):

Q.P. Cao ◽

L.J. Sun ◽

C. Wang ◽

Y. Fu ◽

S.Y. Liu ◽

...

Keyword(s):

Thin Films ◽

Amorphous Alloy ◽

Creep Behavior ◽

Loading Rate ◽

Deformation Mode ◽

Mode Transition ◽

Transformation Zone ◽

Shear Transformation ◽

Shear Transformation Zone

Download Full-text

Critical concentration of Mg addition for plastic instabilities in Al–Mg alloys

Journal of Materials Research ◽

10.1557/jmr.2000.0147 ◽

2000 ◽

Vol 15 (5) ◽

pp. 1037-1040 ◽

Cited By ~ 22

Author(s):

N. Q. Chinh ◽

F. Csikor ◽

Zs. Kovács ◽

J. Lendvai

Keyword(s):

Room Temperature ◽

Loading Rate ◽

Critical Concentration ◽

Solute Concentration ◽

Mg Alloys ◽

Depth Sensing ◽

Solute Content ◽

Mg Addition ◽

Constant Loading Rate ◽

Al Mg Alloys

Plastic instabilities were investigated by the depth-sensing microhardness test in binary high-purity Al–Mg alloys with different Mg contents. During the tests the applied load was increased from 0 to 2000 mN at constant loading rate. The instabilities appeared as characteristic steps in the load–depth curves during indentation. It was shown that the occurrence and development of the plastic instabilities depend strongly on the solute content. Furthermore, the plastic instabilities occurred only when the solute concentration was larger than a critical value, C0. From room-temperature tests on Al–Mg alloys, C0 was found to be 0.86 wt% Mg. The critical concentration, which is necessary to get plastic instabilities, was also interpreted theoretically.

Download Full-text

Compressive creep behavior of an electric brush-plated nanocrystalline Cu at room temperature

Journal of Applied Physics ◽

10.1063/1.3247583 ◽

2009 ◽

Vol 106 (8) ◽

pp. 086105 ◽

Cited By ~ 13

Author(s):

Guoyong Wang ◽

Jianshe Lian ◽

Zhonghao Jiang ◽

Liyuan Qin ◽

Qing Jiang

Keyword(s):

Creep Behavior ◽

Room Temperature ◽

Compressive Creep

Download Full-text

Study on the mutual interactions between the parameters of a CANON system and its coping strategy when operating at room temperature (15 to 25 °C) using response surface methodology

Water Science & Technology ◽

10.2166/wst.2014.062 ◽

2014 ◽

Vol 69 (9) ◽

pp. 1805-1812 ◽

Cited By ~ 1

Author(s):

Jian Zhou ◽

Guangxu Qin ◽

Jianbing Zhang ◽

Yancheng Li ◽

Qiang He ◽

...

Keyword(s):

Response Surface Methodology ◽

Response Surface ◽

Removal Efficiency ◽

Coping Strategy ◽

Room Temperature ◽

Loading Rate ◽

Nitrogen Loading ◽

Independent Variables ◽

Do Concentration ◽

N Loading

The coping strategy of a CANON (completely autotrophic nitrogen removal over nitrite) reactor working at room temperature was investigated using response surface methodology. The total nitrogen (TN) removal efficiency was taken as a dependent variable. The temperature (X), dissolved oxygen (DO) concentration (Y), and influent nitrogen loading rate (Z) were taken as independent variables. Results showed that the relation of these three independent variables can be described by the TN removal efficiency expressed as −5.03 + 1.51X + 45.16Y + 30.13Z + 0.26XY + 1.84XZ − 0.04X2 − 9.06Y2 − 99.00Z2. The analysis of variance proved that the equation is applicable. The response surface demonstrated that the temperature significantly interacts with the DO concentration and influent N loading rate. A coping strategy for the CANON reactor working at room temperature is thus proposed: altering the DO concentration and the N loading rate to counterbalance the impact of low temperature. The verification test proved the strategy is viable. The TN removal efficiency was 91.3% when the reactor was operated under a temperature of 35.0 °C, a DO of 3.0 mg/L, and a N loading rate of 0.70 kgN/(m³ d). When the temperature dropped from 35.0 to 19.2 °C, the TN removal efficiency was kept at 88.7% by regulating the influent N loading rate from 0.7 kgN/(m³ d) to 0.35 kgN/(m³ d) and the DO concentration from 3.0 to 2.6 mg/L.

Download Full-text

Modeling of Nonlinear Viscoelastic Creep of Polycarbonate

e-Polymers ◽

10.1515/epoly.2007.7.1.191 ◽

2007 ◽

Vol 7 (1) ◽

Cited By ~ 2

Author(s):

Wenbo Luo ◽

Said Jazouli ◽

Toan Vu-Khanh

Keyword(s):

Creep Behavior ◽

Room Temperature ◽

Multiple Integral ◽

Model Fit ◽

Viscoelastic Creep ◽

Commercial Grade ◽

Nonlinear Viscoelastic ◽

Schapery Model ◽

Special Case ◽

Better Than

AbstractThe creep behavior of a commercial grade polycarbonate was investigated in this study. 10 different constant stresses ranging from 8 MPa to 50 MPa were applied to the specimen, and the resultant creep strains were measured at room temperature. It was found that the creep could be modeled linearly below 15 MPa, and nonlinearly above 15 MPa. Different nonlinear viscoelastic models have been briefly reviewed and used to fit the test data. It is shown that the Findley model is a special case of the Schapery model, and both the Findley model and the simplified multiple integral representation are suitable for properly describing the creep behavior of the polycarbonate investigated in this paper; however, the Findley model fit the data better than the simplified multiple integral with three terms.

Download Full-text