Utilization of a thermogravimetric technique to determine low solubilitiesof gases in alloys: application to Fe-N and Ni-N alloys between 700 and 1000 degrees C

A thermogravimetric technique has been utilized to determine the solubility of nitrogen gas in solid iron and nickel. For solid iron, results are in g ood agreement with those of previous studies. The method has also proven su fficiently sensitive to detect the effect of the ferromagnetic to paramagne tic transformation on nitrogen solubility. In solid nickel, measurements ha ve shown that nitrogen gas solubility at atmospheric pressure varies betwee n 0.0012 wt. % and 0.0006 wt. % in the temperature range 700 to 1000 degree s C. The dissolution of nitrogen in nickel is an exothermic process. (C) 19 99 Elsevier Science S.A. All rights reserved.