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2006•Journal of Functional BiomaterialsOpen access

Microstructure and martensitic transformation of Ni_(56)Fe_(17)Ga_(27-x)Co_x alloy

YU Hui-ru

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Abstract

The effects of Co content on microstructure and martensitic transformation of Ni_(56)Fe_(17)Ga_(27-x)Co_x alloys have been investigated by optical microscope,XRD and DSC methods.The experiment results showed that the microstructure of as-melted alloys was composed of martensitic phase and γ phase at room temperature.The volume fraction of γ phase increased with Co content increasing.Particularly,in Ni_(56)Fe_(17)Ga_(21)Co_6 alloy,the volume fraction of γ phase increased up to 70%.The crystal structure of the martensite phase was determined to be 6M.The alloys exhibited one-step martensitic transformation during the process of cooling and heating.With the increase of Co content,the M_s and A_s temperatures increased.

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The effects of Co content on microstructure and martensitic transformation of Ni_(56)Fe_(17)Ga_(27-x)Co_x alloys have been investigated by optical microscope,XRD and DSC methods.The experiment results showed that the microstructure of as-melted alloys was composed of martensitic phase and γ phase at room temperature.The volume fraction of γ phase increased with Co content increasing.Particularly,in Ni_(56)Fe_(17)Ga_(21)Co_6 alloy,the volume fraction of γ phase increased up to 70%.The crystal structure of the martensite phase was determined to be 6M.The alloys exhibited one-step martensitic transformation during the process of cooling and heating.With the increase of Co content,the M_s and A_s temperatures increased.

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Available abstract

The effects of Co content on microstructure and martensitic transformation of Ni_(56)Fe_(17)Ga_(27-x)Co_x alloys have been investigated by optical microscope,XRD and DSC methods.The experiment results showed that the microstructure of as-melted alloys was composed of martensitic phase and γ phase at room temperature.The volume fraction of γ phase increased with Co content increasing.Particularly,in Ni_(56)Fe_(17)Ga_(21)Co_6 alloy,the volume fraction of γ phase increased up to 70%.The crystal structure of the martensite phase was determined to be 6M.The alloys exhibited one-step martensitic transformation during the process of cooling and heating.With the increase of Co content,the M_s and A_s temperatures increased.

Key concepts: Materials science, Microstructure, Alloy, Volume fraction, Martensite, Diffusionless transformation, Phase (matter), Metallurgy

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