Improved tensile creep properties of yttrium- and lanthanum-doped alumina: a solid solution effect

2001 ◽  
Vol 16 (2) ◽  
pp. 425-429 ◽  
Author(s):  
Junghyun Cho ◽  
Chong Min Wang ◽  
Helen M. Chan ◽  
J. M. Rickman ◽  
Martin P. Harmer
Keyword(s):  
Solid Solution ◽  
Steady State ◽  
Creep Behavior ◽  
Solubility Limit ◽  
Steady State Creep ◽  
Tensile Creep ◽  
Creep Properties ◽  
Uniform Microstructure ◽  
Equiaxed Grains ◽  
Rare Earth Doped

The tensile creep behavior of yttrium- and lanthanum-doped alumina (at dopant levels below the solubility limit) was examined. Both compositions (100 ppm yttrium, 100 ppm lanthanum) exhibited a uniform microstructure consisting of fine, equiaxed grains. The creep resistance of both doped aluminas was enhanced, compared with undoped alumina, by about two orders of magnitude, which was almost the same degree of improvement as for materials with higher dopant levels (in excess of the solubility limit). In addition, measured creep rupture curves exhibited predominantly steady-state creep behavior. Our results, therefore, verified that the creep improvement in these rare-earth doped aluminas was primarily a solid-solution effect.

Tensile Creep Behavior of NiAl-9Mo Eutectic Alloy

2005 ◽  
Vol 475-479 ◽  
pp. 763-766 ◽  
Author(s):  
Wei Li Ren ◽  
Jian Ting Guo ◽  
Gu Song Li ◽  
Jian Sheng Wu
Keyword(s):  
Steady State ◽  
Eutectic Alloy ◽  
Creep Behavior ◽  
Dislocation Climb ◽  
Steady State Creep ◽  
Tensile Creep ◽  
Final Fracture ◽  
Colony Boundary ◽  
Kinetics Of ◽  
Nial Matrix

The tensile creep behavior of NiAl-9Mo eutectic alloy has been investigated over a stress range of 50 to 100MPa at the temperatures ranging from 850 to 950°C. All of the creep curves exhibit the very long steady-state stage. The creep parameters and TEM observations indicates the kinetics of the steady-state creep deformation is governed by dislocation climb in the NiAl matrix phase. The crack origination and development at the colony boundary results in the onset of tertiary creep stage and final fracture of the alloy.

scholarly journals Steady-State Creep Behavior of Super304H Austenitic Steel at Elevated Temperatures

2015 ◽  
Vol 28 (11) ◽  
pp. 1336-1343 ◽  
Author(s):  
Ping Ou ◽  
Long Li ◽  
Xing-Fei Xie ◽  
Jian Sun
Keyword(s):  
Steady State ◽  
Austenitic Steel ◽  
Creep Behavior ◽  
Elevated Temperatures ◽  
Steady State Creep

The effect of solute additions on the steady-state creep behavior of dispersion-strengthened aluminum

1971 ◽  
Vol 2 (11) ◽  
pp. 3027-3034 ◽  
Author(s):  
G. H. Reynolds ◽  
F. V. Lenel ◽  
G. S. Ansell
Keyword(s):  
Steady State ◽  
Creep Behavior ◽  
Steady State Creep

Steady-state creep behavior of hot isostatically pressed niobium carbide

1987 ◽  
Vol 22 (9) ◽  
pp. 1233-1240 ◽  
Author(s):  
R.D. Nixon ◽  
S. Chevacharoenkul ◽  
R.F. Davis
Keyword(s):  
Steady State ◽  
Creep Behavior ◽  
Niobium Carbide ◽  
Steady State Creep

The effect of thickness on the steady-state creep properties of freestanding aluminum nano-films

2012 ◽  
Vol 60 (11) ◽  
pp. 4438-4447 ◽  
Author(s):  
Hiroyuki Hirakata ◽  
Naomichi Fukuhara ◽  
Shoichi Ajioka ◽  
Akio Yonezu ◽  
Masayuki Sakihara ◽  
...  
Keyword(s):  
Steady State ◽  
Steady State Creep ◽  
Creep Properties

The Investigation of Creep Behavior for NiAl-28Cr-5.5Mo-0.5Hf-0.02wt.%P Alloy at High Temperature

2011 ◽  
Vol 279 ◽  
pp. 28-32
Author(s):  
Guang Ye Zhang ◽  
Dong Wen Ye ◽  
Jin Lin Wang ◽  
You Ming Chen ◽  
Long Fei Liu ◽  
...  
Keyword(s):  
Steady State ◽  
High Temperature ◽  
Creep Behavior ◽  
Fracture Behavior ◽  
Primary Creep ◽  
Dislocation Climb ◽  
Steady State Creep ◽  
Creep Fracture ◽  
Creep Mechanisms ◽  
Higher Temperature

The Microstructure and creep behavior for NiAl-28Cr-5.5Mo-0.5Hf-0.02wt.%P alloy at high temperature have been investigated in this paper. The results reveal that the high temperature creep behavior of the NiAl-28Cr-5.5Mo-0.5Hf-0.02wt.%P alloy is characterized by transient primary creep and dominant steady-state creep as well as ternary creep behavior. The primary creep can be described by Garofalo equation and the steady-state creep can be depicted by Dorn equation. The creep mechanisms are viscous glide of dislocations at lower and middle testing temperatures and dislocation climb at higher temperature. No change of the microstructure for the testing alloy indicates that the creep fracture is controlled by the formation and propagation of cavities and cracks, and the creep fracture behavior obeys Monk man-Grant relationship.

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