منابع مشابه
Magnetostriction of iron-germanium single crystals
The addition of nonmagnetic Ga into body-centered cubic Fe enhances the magnetostriction constant λ100 over tenfold. Literature reports for substitution of Ge at low concentrations suggest that the addition of Ge also enhances the magnetostriction. In this work, the magnetostriction and microstructure of Fe–Ge were investigated to correlate magnetostriction with microstructure. The magnetostric...
متن کاملPhase-Field Analysis of Fracture-Induced Twinning in Single Crystals
Deformation twinning at the tip of a straight crack or notch is analyzed using a phase-field method that seeks equilibrium twin morphologies via direct minimization of a free energy functional. For isotropic solids, the tendency to twin under mode I or mode II loading is found to depend weakly on Poisson’s ratio and elastic nonlinearity and strongly on surface energy and twinning shear (i.e. ei...
متن کاملThreshold crack speed controls dynamical fracture of silicon single crystals.
Fracture experiments of single silicon crystals reveal that after the critical fracture load is reached, the crack speed jumps from zero to approximately 2 km/sec, indicating that crack motion at lower speeds is forbidden. This contradicts classical continuum fracture theories predicting a continuously increasing crack speed with increasing load. Here we show that this threshold crack speed may...
متن کاملAtomistic study of crack-tip cleavage to dislocation emission transition in silicon single crystals.
At low temperatures silicon is a brittle material that shatters catastrophically, whereas at elevated temperatures, the behavior of silicon changes drastically over a narrow temperature range and suddenly becomes ductile. This brittle-to-ductile transition has been observed in experimental studies, yet its fundamental mechanisms remain unknown. Here we report an atomistic-level study of a funda...
متن کاملIron(II)-mimosine catalyzed cleavage of DNA.
Mimosine, DNA breaKs, Free Radicals, Fenton Reaction Supercoiled plasmid DNA was treated in vitro with H2O2, DTT and either Fe (II), Fe (II)-EDTA or Fe (II)-mimosine. The rate of DNA break formation was followed by the conversion of the supercoiled form into relaxed-circular and linear forms. In the concentration interval of 0-4 microM Fe (II), Fe (II)-EDTA slowed-down the formation of DNA brea...
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ژورنال
عنوان ژورنال: Tetsu-to-Hagane
سال: 1973
ISSN: 0021-1575,1883-2954
DOI: 10.2355/tetsutohagane1955.59.7_955