Microstructural study of rapidly solidified titanium eutectoid alloys

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Abstract

Rapid solidification of Ti-7.3wt.%Cu (near-eutectoid composition), Ti-36.2wt.%Ni and Ti-34.3wt.% Ni-5.8wt.%Si alloys has been carried out by electron beam melting and splat quenching on a water-cooled rotating copper disc. The product obtained was in the form of thin ribbons 60-100 μm thick. Transmission electron microscopy studies of TiCu alloy splats showed that the microstructure consisted of a mixture of martensite and a lamellar eutectoid product. The formation of the intermetallic compound Ti2Cu involved a diffusionless ω transformation and spinodal clustering. In the case of TiNi alloy the as-quenched microstructure is complex, consisting of α, transformed β and intermetallic phases. This could have arisen possibly as a result of local variation in cooling rates. Rapid solidification of TiNiSi alloy resulted in partial quenching of an amorphous phase. The amorphous phase was seen to be extremely hard (a Vickers hardness of about 800 HV). © 1988.

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Bhaskaran, T. A., Seshadri, R., Krishnan, R. V., & Ranganathan, S. (1988). Microstructural study of rapidly solidified titanium eutectoid alloys. Materials Science and Engineering, 98(C), 251–255. https://doi.org/10.1016/0025-5416(88)90164-4

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