On the position of the coherency spinodal curve in an AlZn (18 at.%) alloy

✍ Scribed by Dr. R. Kroggel; Prof. Dr. habil. H. Löffler; O. Kabisch

• Publisher: John Wiley and Sons
• Year: 1977
• Tongue: English
• Weight: 337 KB
• Volume: 12
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.19770120710

✦ Synopsis

Abstract

The values of the wavelength of the dominating concentration fluctuations λ~f1~ (analyzing the “inverse XSAS‐spectrum”) and the kinetics of the decomposition process (using measurements of microhardness) as a function of the ageing temperature T~a~ are taken in order to get information on the position of the coherent spinodal curve T~c.sp.~ in an AlZn (18 at%) alloy. According to these investigations T~c.sp.~ = (116  5)°C is likely to be obtained. That value is not far from the position of the coherent spinodal curve calculated by LÖFFLER and SIMMICH (1975) (130°C). Some arguments are given that this curve of AlZn (6.8 at.%) should not be placed at 129°C but at much lower temperatures.