The isotherms of the Ir-Ni-Al in the composition range up to 50 at% Al are presented at 1573 K. The phase constitution and microstructure of the Ir-Ni-Al alloys were examined using X-ray diffractometry (XRD), scanning electron microscopy (SEM) with an electron probe microanalyzer (EPMA), and transmission electron microscopy (TEM) after heat treatment at 1573 K for 168 h. The B2-NiAl and B2-IrAl phases connected with each other at 1573 K. The highest solubility limit of Ir into Ni3Al was about 3.5 at% in the tested alloys. Then, a wide fcc + B2 and a narrow fcc + L12and B2 + L12two-phase region appeared in the isothermal section. In part of the B2 phase, a martensitic transformation from the B2 to the L10phase was observed. © 2006 Elsevier Ltd. All rights reserved.
Yamabe-Mitarai, Y., Aoyagi, T., Nishida, K., Aoki, H., Abe, T., & Murakami, H. (2007). Phase equilibria between the B2, L12, and fcc phases in the Ir-Ni-Al system. Intermetallics, 15(4), 479–488. https://doi.org/10.1016/j.intermet.2006.08.015