Shigeo Maruno1 and K\=oichi Ina2
1Material Research Laboratory, Nagoya Institute of Technology, Nagoya
Quantitative analysis of samples in the system Al-Cu alloy in which the alloying elements were distributed homogeneously or heterogeneously was carried out.
The theoretical correction curves calculated from reported values of different mass absorption coefficients ( μ ) and Lenard constans ( σ ) by using an equation given by Philibert for the absorption correction term are compared with experimental data obtained from the homogeneous samples such as evaporated films and single phase intermetallic compounds. It has been found that maxima differences in the corrected values of μ and σ are about 10 and 5 wt%, respectively, and also that the corrected values calculated with the values given by Bucklow and Heinrich for μ and σ , respectively, are in close agreement with the experimental results.
Application of the theoretical equation for the correction of intensities in the homogeneous system to heterogeneous alloys (phase-separated) was investigated experimentally. An effective procedure for determining the average composition of heterogeneous samples within a certain error in measurement has been shown by using parameter ``Rd'' which was obtained on the basis of a model considered with the texture and the difference of concentration of alloying elements between the phases of sample in the irradiated area of electron beam. The relation between the standard deviation of the concentration calculated from the X-ray intensity and the Rd parameter can be widely applied to practical quantitative analyses of all binary alloys.
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