scholarly journals Deformation microstructure and positive temperature dependence of flow stress in Ni3Ge

2016 ◽  
Author(s):  
Yulia Solov’eva ◽  
Vladimir Starenchenko ◽  
Svetlana Starenchenko ◽  
Artem Solov’ev
Keyword(s):  
Flow Stress ◽  
Temperature Dependence ◽  
Positive Temperature ◽  
Deformation Microstructure ◽  
Positive Temperature Dependence

Mechanical Properties of E21 (Mn, Fe)3AIC-Base Alloys

1998 ◽  
Vol 552 ◽  
Author(s):  
Kensyo Suzuki ◽  
Hideki Hosoda ◽  
Shuji Hanada
Keyword(s):  
Mechanical Properties ◽  
Flow Stress ◽  
Temperature Dependence ◽  
Volume Fraction ◽  
Primary Phase ◽  
Positive Temperature ◽  
Compression Tests ◽  
Positive Temperature Dependence ◽  
Fe Content ◽  
Work Hardening Coefficient

ABSTRACTMechanical properties of E21 (Mn, Fe)3AlC-base alloys were investigated. The E21 crystal structure is closely related to L12, and thereby E21 compounds are expected to exhibit superior properties similar to those of the L12 Ni3AL. Nominal compositions are fixed to be 60mol%(Mn, Fe)-20mol%A1–20mol%C. Alloys were prepared by mechanical alloying and hot pressing. ICP chemical analysis, X-ray diffraction analysis, scanning electron microscopy and electron probe microanalysis were carried out for alloy characterization. Mechanical properties were evaluated by Vickers hardness tests at room temperature (RT) and compression tests from RT to 1273K. Strain rate dip tests were also carried out. It is found that most alloys are composed of two phases of E21 as the primary phase and graphite as the precipitates, and that the volume fraction of graphite increases with increasing Fe content. Hardness and 0.2% flow stress at RT are raised with increasing Fe content. At RT, 0.2% flow stress and fracture strength of Fe3A1C alloy used are 2.9GPa and 3.4GPa, respectively. An alloy containing 40%Mn-20%Fe shows weak positive temperature dependence of strength at 700–800K, similar to the observation in some Co3AIC alloys. Moreover, work-hardening coefficient of all alloys shows strong positive temperature dependence below 700K. These results suggest the occurrence of K-W related mechanism for plastic deformation in these alloys.

Effect of Strain Rate on the Plastic Behaviour of Ll2 Compounds Based on Ni3Al

1988 ◽  
Vol 133 ◽  
Author(s):  
Seiji Miura ◽  
Shouichi Ochiai ◽  
Yoshihiro Oya ◽  
Yoshinao Mishima ◽  
Tomoo Suzuki
Keyword(s):  
Flow Stress ◽  
Strain Rate ◽  
Temperature Dependence ◽  
Rate Sensitivity ◽  
Grain Boundary Sliding ◽  
Rate Dependence ◽  
Strain Rate Dependence ◽  
Positive Temperature ◽  
Fine Grain ◽  
Positive Temperature Dependence

ABSTRACTIn both single and polycrystalline Ni3Al, no strain rate dependence of 0.2% flow stress is observed in a temperature range where anomalous positive temperature dependence of strength is exhibited. A distinct strain rate dependence is observed, however, in single crystals when the test temperature is raised beyond the peak in flow stress. It is shown that (111) type slip involving diffusional process is responsible for the strain rate sensitivity at near [001] orientation, while (001) type slip which is governed by the Peierls mechanism at orientations away from [001]. In polycrystalline compound with a fine grain size an apparent loss of the positive temperature dependence of strength is observed at a slower strain rate due to grain boundary sliding.

Positive temperature dependence of time-dependent breakdown of GaN-on-Si E-mode HEMTs under positive gate stress

2019 ◽  
Vol 115 (5) ◽  
pp. 052103 ◽  
Author(s):  
F. Masin ◽  
M. Meneghini ◽  
E. Canato ◽  
C. De Santi ◽  
A. Stockman ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Time Dependent ◽  
Positive Temperature ◽  
Positive Temperature Dependence ◽  
Gan On Si

Positive Temperature Dependence of Quadrupole Splittings in Mössbauer Spectra of Fe1.33Nb2.67Se10

2002 ◽  
Vol 57 (6-7) ◽  
pp. 627-630 ◽  
Author(s):  
Takashi Suzuki ◽  
Noriaki Okubo
Keyword(s):  
Temperature Dependence ◽  
Mössbauer Effect ◽  
Mössbauer Spectra ◽  
Positive Temperature ◽  
Mossbauer Effect ◽  
Mossbauer Spectra ◽  
Positive Temperature Dependence ◽  
Low Dimensional

The Mössbauer effect in the low-dimensional compound Fe1.33Nb2.67Se10 has been examined between 78 and 414 K. An anusual positive temperature dependence of the quadrupole splittings was found above 250 K. As a possible origin a mechanism due to π bonding is suggested

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
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