Fracture and deformation potential of magnesium alloys at low temperatures

2002 ◽  
Author(s):  
A. Bussiba
Keyword(s):  
Magnesium Alloys ◽  
Low Temperatures ◽  
Deformation Potential

Effects of Aging Treatment on the Damping Capacities of ZA84-xSb Magnesium Alloys

2012 ◽  
Vol 189 ◽  
pp. 134-138
Author(s):  
Jian Qiang Wang ◽  
Shao Kang Guan ◽  
Hao Zhu
Keyword(s):  
Dislocation Density ◽  
Magnesium Alloys ◽  
High Temperatures ◽  
Low Temperatures ◽  
Treatment Process ◽  
Cast Alloy ◽  
Aging Treatment ◽  
Damping Capacity ◽  
Second Phases ◽  
Effects Of Aging

The effects of aging treatment on the damping capacities of ZA84-xSb alloys were studied. The results show that in the aging treatment process, because of following mainly reasons: (1) the dissolution of the ternary phases, (2) the increase of grain interfaces, (3) the increases of dislocation density, and (4) the micro deformations of matrix interfaces and the second phases, the damping capacity of ZA84-xSb magnesium alloys did not be reduced. On the contrary, whether at the low temperatures or high temperatures, its damping capacity is higher than as-cast alloy, which is of great significance for the application of ZA84-xSb magnesium alloys.

Comparison of Hot Electron Mobility in h-Boron Nitride Nanosheets and Graphene under Manganese Doping

2016 ◽  
Vol 1141 ◽  
pp. 34-38 ◽  
Author(s):  
Ankur Pandya ◽  
Satyam Shinde ◽  
Prafulla K. Jha
Keyword(s):  
Electric Fields ◽  
Electron Mobility ◽  
Low Temperatures ◽  
Deformation Potential ◽  
Hot Electron ◽  
Scattering Mechanism ◽  
Manganese Doping ◽  
High Electric Fields ◽  
Acoustical Phonon ◽  
Mn Concentrations

The electron mobility is calculated for h-BN nanosheets (h-BNNSs) and graphene with and without doping of manganese at high electric fields via acoustical deformation potential (ADP) scattering mechanism and piezoelectric scattering (Polar Acoustical Phonon (PAP) mechanism at low temperatures. Calculation includes the variation of electron Fermi energy and effective mass with high electric fields and with variation of Mn concentrations. Comparison of mobility in both the cases of with and without doping is carried out. It is observed that the net electron mobility due to both ADP and PAP mechanisms in graphene is much larger than that for h-BNNS for both the cases of with and without doping of manganese at low temperatures.

On the photoconductivity of hot electrons in semiconductors at low temperatures

1983 ◽  
Vol 61 (6) ◽  
pp. 821-824
Author(s):  
E. F. El-Wahidy
Keyword(s):  
Low Temperatures ◽  
Theoretical Study ◽  
Zero Point ◽  
Potential Scattering ◽  
Hot Electrons ◽  
Average Lifetime ◽  
Deformation Potential ◽  
Acoustic Phonons ◽  
Temperature Dependences ◽  
Point Lattice

A theoretical study is made of the photoconductivity of hot photoelectrons interacting with acoustic phonons in n-type germanium at low temperature, T = 4 K, when the equipartition of the energy of phonons is not obeyed. Assuming that the energy relaxation of photoelectrons takes place by the spontaneous emission of acoustic phonons, the energy distribution of photoelectrons is obtained using the deformation potential scattering by acoustic phonons for the zero point lattice. The distribution function is then used in calculating the photoconductivity and average lifetime of photoelectrons. New temperature dependences of the photoconductivity and average lifetime arc obtained. It is shown that the new results differ from those reported when equipartition is obeyed.

Fatigue fracture of some magnesium alloys in vacuum at room and low temperatures

1980 ◽  
Vol 15 (4) ◽  
pp. 362-365 ◽  
Author(s):  
V. A. Sertsyuk ◽  
N. M. Grinberg ◽  
I. L. Ostapenko
Keyword(s):  
Magnesium Alloys ◽  
Fatigue Fracture ◽  
Low Temperatures
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