Abstract
As a series of the work to quantitatively make clear the microsegregation in the abnormal microstructure formed in some titanium alloys, the authors tried, at first, to obtain the working curves for Al, Fe, Cr, Mo and V in titanium alloys with the purpose of quantitative analysis by EPMA. The accuracy of the analysis by means of the working curves and the possible minimum size of area for micro-area-analysis were also examined. The results are as follows:
(1) Working curves were obtained in the form of a quadratic or linear equation for each alloying element which was less than 20 wt% in content, using 43 kinds of standard specimens of titanium and titanium alloys. The distribution rate which was obtained from the regression analysis was more than 99% for each working curve, the error of the working curves being within the range of 0.09∼0.38 wt%.
(2) In quantitative analysis of Ti-Fe binary alloys, the measured Fe concentrations of the α and β phases were compared with those of the α and β phases which were easily assumed from Ti-Fe binary equilibrium diagram, and the results showed good agreement. It was also found that an area of 3 μ square would be sufficient to measure the concentration in the micro-area quantitative analysis.
(3) The quantitative analysis of concentrations in a micro-area, namely the microsegregation analysis of the abnormal microstructures of titanium binary and multiple alloy systems has proved great possibilities by the use of the working curve method with EPMA.
