The purpose of the present study was to investigate the microstructure and microhardness of novel Ti7CuXSn alloys. Ti7CuXSn alloys with x = 0, 1, 2·5 and 5 wt- were synthesised using a well developed arc melting and casting method. The microstructure was analysed by means of optical microscopy, SEM and X-ray diffraction methods. The cellular grain size dG, lamellar spacing λL, volume fraction of Ti2Cu phases fv and microhardness HV were measured. The addition of Sn content into the Ti7Cu alloy can effectively increase the solubility of Cu in the eutectoid microstructure (α-Ti+Ti2Cu), induce transformation of ultrafine α′ martensite microstructure and increase the volume fraction of the Ti2Cu phase fv. Especially, ultrafine microstructures have been produced in as cast Ti7Cu5Sn alloys. The value of HV increases with the increasing values of
,
and fv.
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