Mechanical properties at 2223 K and oxidation behavior of Ir alloys

• Published in: Intermetallics Vol. 48; pp. 86 - 92
• Main Authors: Yamabe-Mitarai, Yoko, Murakami, Hideyuki
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.05.2014
• Subjects: Alloys; B. Mechanical properties at high temperatures; B. Solid-solution hardening; Evaporation; F. Metallographic techniques; G. Automotive uses; Iridium base alloys; Oxidation; Oxidation tests; Oxides; Periodic table; Strength; F. Metallographic techniques; B. Mechanical properties at high temperatures; B. Solid-solution hardening; G. Automotive uses
• ISSN: 0966-9795; 1879-0216
• DOI: 10.1016/j.intermet.2013.09.014

Compressive strengths of twelve Ir-1at%X binary alloys were evaluated at 2223 K to understand the strengthening effects of alloying elements. The alloying elements were selected from group 4 to group 10 in the periodic table. The maximum strength of about 65 MPa was obtained in Ir–Hf and Ir–Zr alloys. The effect of adding multiple alloying elements on strength was also investigated. Isothermal oxidation behavior was investigated at 1373 K for Ir alloys including Nb and/or Hf. The weight of all the tested alloys decreased linearly during the oxidation test, indicating that Ir oxide evaporated during oxidation. •Compressive strength was systematically measured for Ir-1at%X alloys at 2223 K.•The solid solution hardening effect for each element was identified.•The weight of Ir alloys decreased linearly during isothermal oxidation at 1373 K.