Formation of ultrafine structure in as cast Ti7CuXSn alloys

Abstract

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 [Formula: see text] , [Formula: see text] and fv.

Effect of Sn addition on the corrosion behavior of Ti–7Cu–Sn cast alloys for biomedical applications

“…It is noteworthy that adding 5 wt.% Sn content refined the microstructure greatly, increased the volume fraction of Ti 2 Cu phase (mark d), and gradually eliminated the basket-weave structure. A similar result was also reported by Tsao et al [16]. The initial E OCP for the Ti 7 Cu sample was approximately − 232.6 mV Ag/AgCl , and it rapidly increased and near stabilized in the region of − 176.3 mV Ag/AgCl after 60 min.…”

“…Recently, Tsao et al [16] reported that adding Sn into the Ti 7 Cu alloy can effectively induce the transformation of an ultrafine α′ martensite microstructure and increase the volume fraction of the Ti 2 Cu phase. Tin (Sn) is a non-toxic, non-allergenic alloying element [17] used to strengthen Ti alloys [1].…”

“…So, it has incorporated into the surface of a variety of biomaterials [9,10]. Another, many attempts have been made to develop new Ti-Cu system alloys to achieve better performance [11][12][13][14][15][16][17][18][19][20]. Investigations by Kikuchi et al have shown that Ti-Cu alloys may offer very high mechanical strength associated with good formability [11] and a comparatively lower melting temperature [11,12], which makes it applicable to dental casting processes.…”

Effect of Heat Treatment Conditions on the Mechanical Properties and Machinability of Ti15SnxCu Alloys

“…However, the release of Al and V ions from the alloy might cause cause serious problems 7,8 . Therefore, many efforts have been working out to develop non-toxic elements Ti alloys, such as Ti-Cu 9,10 , Ti-Sn 11 , Ti-Cu-Sn 12,13 , Ti-Nb 14,15 and Ti-15Zr-Mo alloys 16 . It is well known that alloying elements alter the transformation temperatures, phases/crystal structure of titanium alloys 4,5,17 .…”

“…This limited grain size significantly increases the alloy strength 27 . Tsao et al 12 established that the addition of Sn to Ti7CuXSn (X = 0 -5 wt. %) alloys can effectively increase the solubility of Cu in the eutectoid microstructure (α-Ti + Ti 2 Cu), induce the transformation of an ultrafine α′ martensite microstructure and increase the volume fraction of the Ti 2 Cu phase.…”