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Equilibrium grain boundary segregation of anthimony in iron base alloys = Ravnotežna segregacija antimona po mejah zrn v zlitinah železa in antimona
Mast, Ralph ...
The equilibrium grain boundary segregation of antimony was investigated in iron base alloys (Fe-Sb, Fe-C-Sb, Fe-Ni-Sb) after annealing at temperatures between 550°C and 750°C. Utilising Auger ...electron spectroscopy (AES) the concentration of antimony at intergranular fracture faces was determined as a function of bulk concentration and equilibrium temperature. The segregation of antimony in Fe-Sb alloys with 0,012 wt.% - 0,094 wt.% Sb was described by the Langmuir-McLean equation. The evaluation leeds to free enthalpy of segregation ▫$\DeltaG_{segr}$▫ = -19 kJ/mol - T 28J/mol K. For Fe -0,93 wt.% Sb and Fe -1,91 wt.% Sb termodinamic calculation is not possible because of intergranual antimonides had formed. Scanning electron micrographs (SEM) of fractured samples show that the percentage of intergranular fracture increases with an increasing coverage of antimony at the grain boundaries. The addition of carbon to Fe-Sb alloys results in a higher grain boundary cohesion whish is caused by two effect of carbon, displacement of antimony from the grain boundaries by carbon and enhanced grain boundary cohesion. In the Fe-Ni-Sb alloys an additional segregation of nickel was found at the grain boundaries but no enhanced antimony segregation as expected from previous models of other authors, asuming Ni-Sb consegregation.
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