The yield strength anomaly of single-slip-oriented Fe–Al single crystals

2007 ◽  
Vol 15 (2) ◽  
pp. 103-107 ◽  
Author(s):  
D. Wu ◽  
I. Baker ◽  
P.R. Munroe ◽  
E.P. George
Keyword(s):  
Yield Strength ◽  
Single Crystals ◽  
Single Slip

Effects of ternary additions on the deformation behavior of single crystals of MoSi2

2000 ◽  
Vol 646 ◽  
Author(s):  
Haruyuki Inui ◽  
Koji Ishikawa ◽  
Masaharu Yamaguchi
Keyword(s):  
Yield Strength ◽  
Strain Rate ◽  
Single Crystals ◽  
Creep Strain ◽  
High Temperatures ◽  
Low Temperatures ◽  
Deformation Behavior ◽  
Creep Strain Rate ◽  
Compression Creep ◽  
Ternary Additions

ABSTRACTEffects of ternary additions on the deformation behavior of single crystals of MoSi2 with the hard [001] and soft [0 15 1] orientations have been investigated in compression and compression creep. The alloying elements studied include V, Cr, Nb and Al that form a C40 disilicide with Si and W and Re that form a C11b disilicide with Si. The addition of Al is found to decrease the yield strength of MoSi2 at all temperatures while the additions of V, Cr and Nb are found to decrease the yield strength at low temperatures and to increase the yield strength at high temperatures. In contrast, the additions of W and Re are found to increase the yield strength at all temperatures. The creep strain rate for the [001] orientation is significantly lower than that for the [0 15 1] orientation. The creep strain rate for both orientations is significantly improved by alloying with ternary elements such as Re and Nb.

Surface film softening of iron single crystals oriented for single slip

1977 ◽  
Vol 39 (2) ◽  
pp. 491-498 ◽  
Author(s):  
K. Kojima ◽  
M. Meshii
Keyword(s):  
Single Crystals ◽  
Surface Film ◽  
Single Slip

Asymmetry of the yield strength in single crystals of titanium nickelide

2007 ◽  
Vol 104 (5) ◽  
pp. 505-513 ◽  
Author(s):  
N. S. Surikova ◽  
A. N. Tyumentsev ◽  
O. V. Lysenko
Keyword(s):  
Yield Strength ◽  
Single Crystals ◽  
Titanium Nickelide

Evolution of substructures in deformed NiAl single crystals oriented for single slip

1999 ◽  
Vol 79 (7) ◽  
pp. 1555-1566 ◽  
Author(s):  
Xiaoli Shi ◽  
S. Mahajan ◽  
T. M. Pollock ◽  
V. S. Arunachalam
Keyword(s):  
Single Crystals ◽  
Single Slip

Slip Transition and Dislocation Structures in Off-Stoichiometric NiAl Single Crystals

1996 ◽  
Vol 460 ◽  
Author(s):  
R. Srinivasan ◽  
M. F. Savage ◽  
M. S. Daw ◽  
R. D. Noebe ◽  
M. J. Mills
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Yield Strength ◽  
Single Crystals ◽  
Compression Tests ◽  
Transmission Electron ◽  
Strength Curve ◽  
Slip Transition

ABSTRACTCompression tests have been performed on hard-oriented Ni-44A1 single crystals for several temperatures and strain levels. There is a slip transition from a<111> type slip to non-a<111> type slip which corresponds with the observation of yield points. Transmission electron microscopy studies provide evidence for decomposition of a<111> dislocations into a<101> and a<010> dislocations near the “knee” of the yield strength curve. The mechanism of this slip transition and the nature of the dislocation processes both below and above the “knee” are described.

Dependence of yield strength of Pb single crystals at 77 K on Au concentration

1980 ◽  
Vol 14 (1) ◽  
pp. 83-87 ◽  
Author(s):  
Ali-Reza Yavari ◽  
David Turnbull
Keyword(s):  
Yield Strength ◽  
Single Crystals

The detection of submicroscopic lattice defects in aluminium utilizing a vacancy supersaturation

1969 ◽  
Vol 314 (1516) ◽  
pp. 129-141 ◽  
Keyword(s):  
Single Crystals ◽  
Screw Dislocation ◽  
Lattice Defects ◽  
Supersaturated Solution ◽  
Dislocation Loops ◽  
Single Slip ◽  
Quench Temperature ◽  
Decoration Technique

The conditions under which submicroscopic defects can be revealed due to decoration by the precipitation of vacant lattice sites from a supersaturated solution have been investigated in aluminium. It is shown that quench temperature, specimen purity and other conditions have to be so chosen that the nucleation of self-sinks is minimized while an adequate vacancy supersaturation is maintained. The conditions for the optimum visibility of defects revealed in this way have been studied primarily by observing the variation in the density of rows of dislocation loops along <110> directions. This decoration technique has been used in quenched single crystals deformed in single slip to show that these rows and also narrow faulted dislocation dipoles with their long axes in the <110> direction form along the specific <110> direction predicted from a hypothesis involving the dragging of a jog by a moving screw dislocation.

A Dimensional Analysis Model for Geometric Size Effects of Single Crystals

2010 ◽  
Vol 97-101 ◽  
pp. 2184-2187
Author(s):  
Xiao Liang Chen ◽  
Shun Hong Lin ◽  
Zuan Tian
Keyword(s):  
Yield Strength ◽  
Single Crystals ◽  
Dimensional Analysis ◽  
Size Effects ◽  
Surface Effect ◽  
Analysis Model ◽  
Size Dependent ◽  
Nano Scale ◽  
Geometric Size ◽  
Metal Single Crystals

Due to the relatively high surface-to-volume ratio, the surface effect can be significant for micro/nano-scale materials. This paper focuses on geometric size-dependent strength mechanisms of micro/nano-scale metal single crystals. A dimensional analysis model relating surface energy with the geometric size-dependent yield strength is presented and compared with results of microscale uniaxial compression tests on Ni and Au single crystals. The results indicate this model can predict the geometric size effects on the yield strength of micro/nano-scale metal single crystals.

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