On Dislocation Motion and Creep Rate in High-Temperature Steady-State Creep of Copper Single Crystals

1969 ◽  
Vol 33 (12) ◽  
pp. 1333-1337 ◽  
Author(s):  
Tadashi Hasegawa ◽  
Hiroshi Sato ◽  
Seiichi Karashima
Keyword(s):  
Steady State ◽  
High Temperature ◽  
Creep Rate ◽  
Single Crystals ◽  
Dislocation Motion ◽  
Steady State Creep ◽  
Copper Single Crystals

Design of Pressurized Cylinders for High-Temperature Applications

1960 ◽  
Vol 82 (2) ◽  
pp. 477-481
Author(s):  
J. F. Traexler
Keyword(s):  
Steady State ◽  
High Temperature ◽  
Creep Rate ◽  
Plane Strain ◽  
Material Properties ◽  
Rate Function ◽  
Specific Form ◽  
Steady State Creep ◽  
Numerical Examples ◽  
Walled Cylinder

General equations for the stresses in a thick-walled cylinder in a state of plane strain are derived considering “steady-state” creep. A specific form of the creep-rate function is assumed and numerical examples are included to show the effect of geometry and material properties.

Features of the subboundary structure in deformed molybdenum single crystals

1978 ◽  
Vol 36 (1) ◽  
pp. 316-317
Author(s):  
M.M. Myshlyaev ◽  
I.I. Khodos ◽  
O.N. Senkov ◽  
Yu.A. Romanov
Keyword(s):  
Steady State ◽  
High Temperature ◽  
Single Crystals ◽  
Dislocation Line ◽  
Regular Structure ◽  
Steady State Creep ◽  
Burgers Vector

The subboundary structure corresponding to the high temperature steady-state creep of molybdenum single crystals is formed by both regular sites of dislocation nets and walls, various in structure and composition, (the nets are formed by two, three, five and six dislocation sets having different values of the angles between the Burgers vector Ḇ and the dislocation line ū ; the walls are formed by one, two and three sets of edge and mixed dislocations; the Burgers vectors of the dislocations are I/2 <III> and, <I00>) and by the sites of a more complex and less regular structure. Several of these are considered below.Fig.I represents a subboundary formed by five dislocation sets.Its regular sites (nets) can be formed by means of interaction of dislocations I and 4 with dislocations 2 (fig.2a). In several irregular sites (fig.I and 2b) no dislocations 2 are seen to be present, and neither dislocations 3 and 5 arisen from the reactions of dislocations 2 with dislocations I and 4.

High Temperature Creep Behavior of Zn-1.0Cu-0.2Ti Alloy

2011 ◽  
Vol 287-290 ◽  
pp. 769-776 ◽  
Author(s):  
Lai Rong Xiao ◽  
Xi Min Zhang ◽  
Yan Wang ◽  
Wei Li ◽  
Quan Sheng Sun ◽  
...  
Keyword(s):  
Steady State ◽  
High Temperature ◽  
Creep Rate ◽  
Grain Boundary ◽  
Testing Machine ◽  
Steady State Creep ◽  
Diffusional Creep ◽  
High Temperature Creep ◽  
Steady State Creep Rate ◽  
Temperature Creep

In the present work, Zn-1.0Cu-0.2Ti alloy was prepared by melt casting and extruding processes. High temperature creep property of the alloy was determined using electronic creep relaxation testing machine. Microstructures of the alloy before and after creep test were observed and its high temperature creep mechanism was discussed. The results show that the steady-state creep rate of the alloy increases with temperature and stress. The logarithm of steady-state creep rate (ln) shows a linearity relationship with the logarithm of the stress (lnσ) and reciprocal of temperature (1/T). The stress exponent and apparent activation energy for creep have been determined to be 5.10 and 83.7 kJ/mol, separately. The predominant mechanism is mainly self-diffusional creep. The second phases on the grain boundary can block the slip of grain boundary and dislocation motion which can improve creep resistance of the alloy.

scholarly journals Observations of pressure effects on the creep of ice single crystals

1996 ◽  
Vol 42 (140) ◽  
pp. 169-175 ◽  
Author(s):  
David M. Cole
Keyword(s):  
Steady State ◽  
Creep Rate ◽  
Single Crystals ◽  
Basal Slip ◽  
Confining Pressure ◽  
Absolute Temperature ◽  
Steady State Creep ◽  
Pressure Effects ◽  
Steady State Creep Rate ◽  
Experimental Errors

AbstractExperiments performed on ice single crystals oriented for basal slip indicate that the steady-state creep rate is only marginally affected by confining pressure up to 19 MPa, at a constant absolute temperature of 263 K. The observations Contradict earlier work at similar pressures and the disparity is examined in terms of experimental errors.

scholarly journals Observations of pressure effects on the creep of ice single crystals

1996 ◽  
Vol 42 (140) ◽  
pp. 169-175
Author(s):  
David M. Cole
Keyword(s):  
Steady State ◽  
Creep Rate ◽  
Single Crystals ◽  
Basal Slip ◽  
Confining Pressure ◽  
Absolute Temperature ◽  
Steady State Creep ◽  
Pressure Effects ◽  
Steady State Creep Rate ◽  
Experimental Errors

AbstractExperiments performed on ice single crystals oriented for basal slip indicate that the steady-state creep rate is only marginally affected by confining pressure up to 19 MPa, at a constant absolute temperature of 263 K. The observations Contradict earlier work at similar pressures and the disparity is examined in terms of experimental errors.

Creep Prediction From Stress Relaxation Coupled With Equivalent Relaxation Rate

2014 ◽  
Vol 644-650 ◽  
pp. 1382-1385
Author(s):  
Jin Quan Guo ◽  
Wu Zhou Meng ◽  
Fei Li ◽  
Li Xin Wang
Keyword(s):  
Steady State ◽  
High Temperature ◽  
Creep Rate ◽  
Stress Relaxation ◽  
Relaxation Rate ◽  
Steady State Creep ◽  
Creep Tests ◽  
Conversion Model ◽  
Two Stages ◽  
Good Agreement

Several stress relaxation and creep tests of high temperature material are performed. According to the characteristics of stress relaxations and the superposition equation of diffusion and Maxwell equations of two stages, equivalent relaxation time and equivalent relaxation rate are proposed. Considering equivalent relaxation rate as the creep rate under constant stress, the relaxation-creep conversion model is built up and presented. Then the steady-state creep curve and creep rate are calculated. The results show that the numerical results are in good agreement with the experimental data. It indicates that equivalent relaxation rate can be employed for the analysis of steady-state creep rate. The conversion model and method can be used to design the creep strength and predict the life of the component at high temperature.

Study on Thermal Cycling of Sn0.7Cu Solder

2013 ◽  
Vol 791-793 ◽  
pp. 362-365
Author(s):  
Li Yang ◽  
Ju Li Li ◽  
Jing Guo Ge ◽  
Meng Li ◽  
Nan Ji
Keyword(s):  
Shear Stress ◽  
Steady State ◽  
High Temperature ◽  
Thermal Cycling ◽  
Shear Strain ◽  
Maximum Shear Stress ◽  
Steady State Creep ◽  
Maximum Shear Strain ◽  
Cycle Number ◽  
State Cycle

Thermal cycling of a unit Sn0.7Cu solder was studied based on the steady-state creep constitutive equation and Matlab software. The results show that there is a steady-state cycle for the thermal cycling of unit Sn0.7Cu eutectic solder. In steady-state thermal cycling, the shear stress is increased with the increase of temperature. There is a stage of stress relaxation during high temperature. A liner relationship between maximum shear stress and maximum shear strain is observed during thermal cycling. The metastable cycle number is declined greatly with the increase of maximum shear strain.

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