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Effect of severe cold-rolling and annealing on microstructure and mechanical properties of AlCoCrFeNi2.1 eutectic high entropy alloy

I.S. Wani ; T. Bhattacharjee ; Saad Sheikh (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Y. Lu ; S. Chatterjee ; Sheng Guo (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; P.P. Bhattacharjee ; N. Tsuji
IOP Conference Series: Materials Science and Engineering (1757-8981). Vol. 194 (2017), 1, p. Article no 012018.
[Konferensbidrag, refereegranskat]

The possibility of microstructural refinement and improvement of mechanical properties by severe cold-rolling was investigated in an AlCoCrFeNi2.1 lamellar eutectic high entropy alloy (EHEA). The as-cast alloy revealed fine scale eutectic mixture of L12 (ordered FCC) and B2 (ordered BCC) phases. During severe cold-rolling up to 90% reduction in thickness the B2 phase maintained the ordered structure, while the L12 phase showed the evolution of a nanocrystalline structure and progressive disordering. Annealing of the severely cold-rolled material resulted in the formation of duplex microstructures composed of two different phases with equiaxed morphologies and significant resistance to grain growth up to 1200°C. Annealing at 1000°C resulted in an optimum strength-ductility balance with the tensile strength of 1175 MPa and the total elongation of 23%. The present results showed that severe cold-rolling and annealing can impart very attractive mechanical properties in complex EHEAs.



Denna post skapades 2017-06-15. Senast ändrad 2017-10-17.
CPL Pubid: 249900

 

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Institutioner (Chalmers)

Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik (2005-2017)

Ämnesområden

Materialteknik

Chalmers infrastruktur