Positive temperature dependence of the yield stress in TiAl L10 type superlattice intermetallic compound single crystals at 293–1273 K

1985 ◽  
Vol 33 (7) ◽  
pp. 1355-1366 ◽  
Author(s):  
T Kawabata ◽  
T Kanai ◽  
O Izumi
Keyword(s):  
Intermetallic Compound ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Yield Stress ◽  
Positive Temperature ◽  
Positive Temperature Dependence

Positive temperature dependence of strength observed in ordered cu3pt single crystals

1992 ◽  
Vol 65 (3) ◽  
pp. 737-747 ◽  
Author(s):  
S. Miura ◽  
K. Mitsui ◽  
Y. Tanaka ◽  
Y. Mishima ◽  
T. Suzuki
Keyword(s):  
Temperature Dependence ◽  
Single Crystals ◽  
Positive Temperature ◽  
Positive Temperature Dependence

Plastic Deformations in Single Crystals of FePd with the L10 Structure

2008 ◽  
Vol 1128 ◽  
Author(s):  
Katsushi Tanaka ◽  
Wang Chen ◽  
Kyosuke Kishida ◽  
Norihiko L. Okamoto ◽  
Haruyuki Inui
Keyword(s):  
Plastic Deformation ◽  
Shear Stress ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Yield Stress ◽  
Room Temperature ◽  
Positive Temperature ◽  
Plastic Deformations ◽  
L10 Structure ◽  
Critical Resolved Shear Stress

AbstractCompressive deformations of L10-ordered single crystals of FePd have been investigated from room temperature to 873 K. The critical resolved shear stress for superlattice dislocations is hard to determine resulting from buckling that occurs after a small amount of conventional plastic deformation. The CRSS for superlattice dislocations determined from yield stress is significantly larger than that of ordinary dislocations. The CRSS for octahedral glide of ordinary and superlattice dislocations are virtually independent of the temperature, and the positive temperature dependence of the yield stress is not observed for both, ordinary and superlattice dislocations, by the present experiments.

A Mechanism of the Positive Temperature Dependence of Yield Stress in Tial

1990 ◽  
Vol 213 ◽  
Author(s):  
T. Kawabata ◽  
T. Kanai ◽  
O. Izumi
Keyword(s):  
Temperature Dependence ◽  
Yield Stress ◽  
Positive Temperature ◽  
K Value ◽  
Pinning Mechanism ◽  
Burgers Vector ◽  
Positive Temperature Dependence ◽  
Transmission Electron ◽  
Schmid Factor ◽  
Critical Resolved Shear Stress

ABSTRACTThe positive temperature dependence of yield stress (PTYS) has been observed (Kawabata et al., Acta Metall., 33, 1355 (1985)) in TiAl single crystals in all orientations operating ordinary dislocations with the Burgers vector 1/2<110] and superdislocations with the Burgers vectors <101] and 1/2<112]. A mechanism for the PTYS is proposed, which is a cross-slip and pinning mechanism of Shockley partials with the Burgers vector 1/6<112] or/and 1/6<121]. The results of strain rate dependence of yield stress, K value dependence of critical resolved shear stress (CRSS) and transmission electron microscopy support the theory. Here, K value is the Schmid factor ratio of a Shockley partial on {101) or {110) plane and a perfect ordinary dislocation or a perfect superdislocation on {111) plane.

Deformation and its Structure in Llo Ti-Al-Nb Compound Alloys

1988 ◽  
Vol 133 ◽  
Author(s):  
Yoo-Dong Hahn ◽  
Sung H. Whang
Keyword(s):  
Temperature Dependence ◽  
Yield Stress ◽  
Uniaxial Compression ◽  
High Temperatures ◽  
Room Temperature ◽  
Fracture Strain ◽  
Positive Temperature ◽  
Deformation Structures ◽  
Miniature Specimens ◽  
Deformation Tests

ABSTRACTThe ternary TiAl-Nb (Llo) alloys stabilized at 1000°C for a week were prepared into miniature specimens for compressive deformation tests. The specimens were deformed in uniaxial compression at room temperature as well as various high temperatures. The yield stress and fracture strain were determined with respect to Nb concentration, and as a function of temperature to investigate positive temperature dependence.Dislocation structures and other deformation structures of the deformed alloys were studied by TEM.

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