Synthesis and structural characterization of co-al binary alloys

Dinler, Ali Fırat
Mekhrabov, Amdulla O.
Akdeniz, Mahmut Vedat
As a part of an investigation on the design and development of Co-based superalloys for hightemperature applications, studies have been made to investigate synthesis route, heat treatment regime and structural characterization of binary Co-Al alloys. Cobalt-rich side of Co-Al binary system was examined by preparing 6 different alloy compositions (1.23, 8.40, 16.72, 19.50, 21.50 and 25 at. % Al), which were produced by arc melting technique. It has been found that DOOR\V KDYLQJ UHODWLYHO\ KLJK $O FRQWHQW • DW Al) reveal primary FCC-Co and eutectic mixture B2-type ordered CoAl and HCP-Co phases at room temperature whereas no CoAl precipitation was detected for low Al FRQWDLQLQJ DOOR\V • DW $O Furthermore, martensitic phase transformation which does not require fast cooling rates has yielded to FCC to HCP transformation in low Al containing alloys. It is interesting to note that, solidification and heat treated structures of Co-Al binary alloys disagree and not consistent with current equilibrium phase diagrams published in literature.
IMMC2018-19th International Metallurgy and Materials Congress, (25 - 27 Ekim 2018)


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Citation Formats
A. F. Dinler, A. O. Mekhrabov, and M. V. Akdeniz, “Synthesis and structural characterization of co-al binary alloys,” İstanbul, Türkiye, 2018, p. 140, Accessed: 00, 2021. [Online]. Available: