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National Repository of Grey Literature 3 records found  Search took 0.01 seconds. 
Grain boundaries in Ni3Ga as paths of rapid diffusion
 Čermák, Jiří ; Růžičková, Jana ; Konecny, M. ; Ipser, H.
Grain boundary diffusivity P (P is a triple product of diffusion coefficient in grain boundary D, grain boundary width .delta. and segregation coefficient s) of nickel was measured by serial sectioning and residual activity methods in temperature interval 973-1373 K. Measurements are compared with our previous results on Ni grain boundary diffusivity in Ni3Al. It was obtained that the values of P for nickel in Ni3Ga are slightly higher than those for nickel in Ni3Al. The observed relation between Ps was interpreted by different affinity of diffusing Ni to different components X in the two Ni3X alloys.
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Modification of transmissivity of hydrogen through the surface of Ni3Al by alloying
 Čermák, Jiří ; Rothová, Věra
Hydrogen invasion into Ni3Al-M was studied by gas-permeation method in temperature range 573 - 1 223 K. The dependence of hydrogen permeation flux J(d) through the membrane-like samples on the samples thickness d enabled us to assess the influence of the surface upon the rate of permeation. The surface transmissivity was introduced as a quantitative characteristic describing the rate of the process. Influence of three modifying elements M = Fe, Cr and Zr was studied. It was found that Zr supports and, on the contrary, Cr eliminates the inhibiting effect of the surface. The iron did not alter significantly the hydrogen transmissivity, and it causes enhanced grain boundary brittleness in hydrogen environment.
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Interaction of vacancy with chosen special tilt grain boundaries - Monte Carlo simulation
 Čermák, Jiří
Structures of chosen special tilt grain boundaries in ordered intermetallic alloy Ni3Al was simulated by Monte Carlo method. The energy of vacancy formation Efv in both Ni- and Al- sublattices was calculated. Using the values of Efv, calculated for bulk and for the grain boundary atom positions, the energy of interaction between the vacancy and the grain boundary was obtained.
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