Mechanical Properties and the Microstructure of β Ti-35Nb-10Ta-xFe Alloys Obtained by Powder Metallurgy for Biomedical Applications

Metals

ConradoR. M. Afonso¹  Vicente Amigó²  Angel Vicente²  Angélica Amigó² 

[1] Universidade Federal de São Carlos (UFSCar), Departamento de Engenharia de Materiais (DEMa), Rodovia Washington Luis, km 235, São Carlos CEP:13565-905, SP, Brazil;Universitat Politècnica de València (UPV), Institut de Tecnologia de Materials (ITM), Camí de Vera s/n, 46022 Valencia, Spain;

关键词: β titanium alloys;    anelastic relaxation;    elastic modulus;    phase transformation;   

DOI  :  10.3390/met9010076

来源: DOAJ

【 摘 要 】

Titanium alloys with high refractory metals content are required to obtain advanced biomaterials with a low elastic modulus and good mechanical properties. This work studies the influence of Fe content on the microstructure and mechanical properties of powder metallurgy Ti35Nb10Ta(Fe) alloys, with Fe content additions of 1.5, 3.0 and 4.5 wt%. Samples are obtained by uniaxial compaction and sintering at 1250 °C and 1300 °C. Microstructural characterization is performed by scanning and transmission electron microscopy and mechanical characterization by bending, compression and a hardness test. The elastic modulus is measured by the ultrasounds technique. The results show a 10% increase in the maximum bending strength with an increase in the sintering temperature. The obtained microstructure is composed of β-Ti phase (bcc) and some regions where laths of the α-Ti (hcp) phase occur along the grain boundaries. Fe addition slightly improves the stability of the β-Ti phase and conversely decreases the maximum strength and final deformability due to increased porosity. The Ti35Nb10Ta alloy composition displays better properties, with an elastic modulus of 75 GPa, a bending strength of 853 MPa and compression strength of 1000 MPa.

【 授权许可】

Unknown