Microstructural characterization of INCOLOY alloy MA 956

✍ Scribed by M. F. Hupalo; M. Terada; A. M. Kliauga; A. F. Padilha

• Publisher: John Wiley and Sons
• Year: 2003
• Tongue: English
• Weight: 311 KB
• Volume: 34
• Category: Article
• ISSN: 0933-5137
• DOI: 10.1002/mawe.200390100

✦ Synopsis

Abstract

Oxide dispersion strengthened (ODS) ferritic materials obtained by mechanical alloying (MA) display particular microstructure and texture. In this paper a microstructural characterization of an INCOLOY MA 956 alloy in the recrystallized (zone annealed) condition is presented. The alloy exhibits a highly anisotropic microstructure, consisting of elongated grains with a high grain aspect ratio (GAR). The alloy also exhibited strong crystallographic texture. The crystallographic direction <111> was approximately parallel to the extrusion direction of the material. The yttria particles, added to the starting powders, react with aluminum and oxygen present in the system during thermomechanical processing and form mixed (Y,Al) oxides. The analysis of extracted particles showed that the majority of yttrium‐aluminum oxides were tetragonal (Y~3~Al~5~O~12~) and orthorhombic (AlYO~3~). Quantitative analysis using TEM micrographs showed two classes of dispersoid sizes.