Effect of atmospheric control during MA-HIP process on mechanical properties of oxide dispersion-strengthened Cu alloy

• Published in: Fusion engineering and design Vol. 124; pp. 1024 - 1027
• Main Authors: Noto, H., Yamada, T., Hishinuma, Y., Muroga, T.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.11.2017; Elsevier Science Ltd
• Subjects: Alloys; Aluminum; Copper; Copper alloy; Copper base alloys; Dispersion; Dispersion hardening alloys; Dispersion strengthening; Electric wire; Elongation; Exposure; Fracture strength; Fusion; Fusion reactors; Mechanical alloying; Mechanical properties; Oxide dispersion strengthening; Reactors; Mechanical properties; Dispersion strengthening; Mechanical alloying; Copper alloy
• ISSN: 0920-3796; 1873-7196
• DOI: 10.1016/j.fusengdes.2017.04.062

In this study, mechanical properties of Dispersion Strengthened (DS)-Cu-Al (aluminum) and Zr (zirconium) alloys, which were fabricated by an MA-HIP method, were investigated for application to the heat sink materials of fusion reactors. The effect of air exposure before the HIP process was studied using a NIFS-Sealing Device. Cu–Al specimen with air exposure before HIP was broken during wire-electrical discharge formation. Cu–Al specimen without air exposure exhibited high fracture strength, but without yielding. Cu–Zr specimen, both with and without the exposure, yielded and exhibits elongation. An increase in yield and tensile strength by approximately 61% and 45%, respectively, were obtained for Cu–Zr specimen by avoiding air exposure. The results showed that Cu–Zr specimen is less susceptible to the atmosphere of the MA-HIP process than Cu–Al.