ISSN:
0142-2421
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Physics
Notes:
The applicablity of the National Bureau of Standards steel standards 461-468 and 662-664 for testing the CARISMACorrection program for quantitative secondary ion analyses, supplied by ARL, Sunland, California, USA. program has been investigated. Measurement of the secondary ion intensity of a number of alloying elements using 16O2+ primary ions of 20 keV kinetic energy and a primary ion beam 130 µm in diameter gave results of good reproducibility for repeated samplings of the same specimen (Srel always 〈0.2), thus indicating a tolerable sampling error. But for some of the elements measured a bad correlation between the secondary ion intensity and the elemental concentration of different standard samples has been found. Carbon (an element of great importance for the properties of steels and of major influence on the outcome of CARISMA calculations) showed the most arbitrary behaviour in this sense. Detailed investigations of the microstructure and microcomposition of the standard samples by metallography, texture analysis, EPMA with X-rays and backscattered electrons, and particularly by SIMA, showed that (a) the carbon secondary ion intensity is correlated to the sum of the Ti, Zr, Nb and Ta concentrations in the samples, and (b) the microvolumes of enhanced carbon secondary ion emission are mainly mixed carbides or carbonitrides of Ti, Zr, Nb and Ta.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/sia.740020302
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