ROUND-ROBIN ATOM-PROBE EXPERIMENT : PRELIMINARY RESULTS IN JAPAN

A round-robin experiment were to be carried out by 6 laboratories in Japan (Nishikawa ; Tokyo Inst. Tech., Sakurai and Igata ; Univ. of Tokyo, Ishikawa ; Hitachi, Tanino ; Nippon Steel Corp. and Nakamura ; Osaka Univ.) under the normal operating condition (T < l00 °K,. pulse fraction ~ 15% ~, P < 10-9 torr). Fe-Cr-Al and W-25%Re alloys, which are divided from a single wire were chosen as the specimen materials. A preliminary analysis of the W-Re alloy of the laboratory concerned show the good agreement with the expecting value even if it was under different experimental conditions. However the apparent concentration of the Fe-Cr-Al alloy show different result and is found to depend on the imaging gas (Ne) pressure even at the same pulse fraction and specimen temperature. The operating condition will be discussed to obtain accurate quantitative analysis of alloys in the atom probe