A New Deformation Region and How Low Do You Go? – "Intrinsic Deformation Limit"

2013 ◽  
Vol 747-748 ◽  
pp. 559-563
Author(s):  
Jun Jie Shen ◽  
Kenichi Ikeda ◽  
Satoshi Hata ◽  
Hideharu Nakashima
Keyword(s):  
Surface Diffusion ◽  
Creep Behavior ◽  
Room Temperature ◽  
Pure Aluminum ◽  
Deformation Region ◽  
Deformation Limit ◽  
Creep Region ◽  
Properties Of Materials ◽  
New Perspective ◽  
Effect Of Surface

The creep deformation in pure aluminum was investigated using helicoid spring samples at room temperature, 298 K, and σ < 1.19 MPa. It was found that the stress exponent is n = 0, which means the creep behavior in this region is independent on applied stress but some physical properties of materials. The creep behavior was suggested to be controlled by surface diffusion based on the strongly effect of surface area on creep behavior only in this creep region (n = 0). The threshold creep rate, , called intrinsic deformation limit, decided by surface diffusion was suggested. This discovery provided a new perspective to understand the extremely slow deformation in the nature.

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

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

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

2009 ◽  
Vol 106 (8) ◽  
pp. 086105 ◽  
Author(s):  
Guoyong Wang ◽  
Jianshe Lian ◽  
Zhonghao Jiang ◽  
Liyuan Qin ◽  
Qing Jiang
Keyword(s):  
Creep Behavior ◽  
Room Temperature ◽  
Compressive Creep

Modeling of Nonlinear Viscoelastic Creep of Polycarbonate

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
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.

scholarly journals Study on fabrication method of composite oxide by room temperature atomic layer deposition

Impact ◽  
2020 ◽  
Vol 2020 (5) ◽  
pp. 16-18
Author(s):  
Fumihiko Hirose
Keyword(s):  
Thin Films ◽  
Atomic Layer Deposition ◽  
Graduate School ◽  
Room Temperature ◽  
Atomic Layer ◽  
Science And Engineering ◽  
Layer Deposition ◽  
Potential Applications ◽  
Properties Of Materials ◽  
Conducting Research

Thin films can be used to improve the surface properties of materials, enhancing elements such as absorption, abrasion resistance and corrosion resistance, for example. These thin films provide the foundation for a variety of applications in various fields and their applications depend on their morphology and stability, which is influenced by how they are deposited. Thin films can be deposited in different ways. One of these is a technology called atomic layer deposition (ALD). Professor Fumihiko Hirose, a scientist based at the Graduate School of Science and Engineering, Yamagata University, Japan, is conducting research on the room temperature ALD of oxide metals. Along with his team, Professor Hirose has developed a new and improved way of performing ALD to create thin films, and the potential applications are endless.

Static Recovery Activation Energy of Pure Aluminum at Room Temperature

2014 ◽  
Vol 136 (3) ◽  
Author(s):  
Yeh An-Chou ◽  
Chuang Ho-Chieh ◽  
Kuo Chen-Ming
Keyword(s):  
Activation Energy ◽  
Room Temperature ◽  
Pure Aluminum ◽  
Pure Copper ◽  
Tensile Tests ◽  
Engineering Strain ◽  
Static Recovery ◽  
Thermally Activated ◽  
Recovered Strain ◽  
Dislocation Annihilation

Thermally activated energy, which varies linearly with static recovered strain, is calculated from static recovery experiments of pure aluminum initially plastically deformed by strain-rate-controlled tensile tests up to 10% engineering strain at room temperature. The activation energy at the initial static recovery is 20 kJ mol−1, which is much less than that of pure copper and attributed to the dislocation annihilation by glide or cross-slip as well as higher stacking fault energy. Once dislocation annihilation processes are exhausted, more energy is required for subgrains to form and then grow. Eventually the recovered strain is slowed down and gradually saturated.

Effect of hydrogen on creep behavior of Ti-6AI-4V alloy at room temperature

1991 ◽  
Vol 18 (6) ◽  
pp. 1125-1130 ◽  
Author(s):  
G. Y. Gao ◽  
S. C. Dexter
Keyword(s):  
Creep Behavior ◽  
Room Temperature

Boss Forming, An Environment-Friendly Rotary Forming

2007 ◽  
Vol 344 ◽  
pp. 947-953 ◽  
Author(s):  
K. Kawai ◽  
H. Koyama ◽  
T. Kamei ◽  
W. Kim
Keyword(s):  
Experimental Study ◽  
Circular Plate ◽  
Working Conditions ◽  
Room Temperature ◽  
Pure Aluminum ◽  
Metal Flow ◽  
Forming Process ◽  
Environment Friendly ◽  
Commercially Pure ◽  
Technological Possibility

Boss forming, which is sometimes called hub forming, has attracted its attention as an environment-friendly rotary forming process to form a circular plate with a hole into a boss shape. An experimental study was conducted to survey the technological possibility of boss forming. Boss forming of A1050-O commercially pure aluminum plate of 10 mm thickness was carried out at room temperature under various working conditions. The effects of the working conditions on the metal flow in boss forming were clarified experimentally.

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