Al-Zn-Mg基合金における準安定析出物組成の3DAP解析 [in Japanese] 3DAP analysis of composition of metastable precipitates in Al-Zn-Mg based alloys [in Japanese]
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Metastable precipitates play important roles in a super high strength Al–Zn–Mg based alloy (Mesoalite<sup>®</sup>). The present study was undertaken to examine the composition of the metastable precipitates in Mesoalite<sup>®</sup> and the effect of Mn addition on the composition. The (Zn+Mg) concentration of η′ metastable precipitates detected by 3DAP (three dimensional atom probe) was ~25% in the alloy Al–4.1Zn–3.1Mg–0.57Cu–0.01Ag (at%). By comparing with the results of G.P. zones in an Al–Zn alloy, it was suggested that the intrusion of Al atoms from the matrix lowered the (Zn+Mg) concentration of metastable precipitates detected by 3DAP. A model to quantify the intrusion of Al atoms was developed and applied to the metastable precipitates. The (Zn+Mg) concentration was quantified to be ~65 at% at 383 K and ~75 at% at 413 K. When the alloy contained Mn, furthermore, it was suggested that Mn affected the Zn/Mg ratio of metastable precipitates by lowering the virtual Zn/Mg ratio of the specimen composition.
- J. Japan Inst. Light Metals
J. Japan Inst. Light Metals 56(11), 655-661, 2006-11-30
The Japan Institute of Light Metals