Voňavková Ilona, Průša Filip, Kubásek Jiří, Michalcová Alena, Vojtěch Dalibor
Department of Metals and Corrosion Engineering, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague, Czech Republic.
Materials (Basel). 2022 Mar 15;15(6):2158. doi: 10.3390/ma15062158.
As the commercially most-used Ti-6Al-4V alloy has a different modulus of elasticity compared to the modulus of elasticity of bone and contains allergenic elements, β-Ti alloy could be a suitable substitution in orthopedics. The spark plasma sintering (SPS) method is feasible for the preparation of materials, with very low porosity and fine-grained structure, leading to higher mechanical properties. In this study, we prepared quaternary Ti-25Nb-4Ta-8Sn alloy using the spark plasma sintering method. The material was also heat-treated in order to homogenize the structure and compare the microstructure and properties in as-sintered and annealed states. The SPS sample had a modulus of elasticity of about 63 ± 1 GPa, which, after annealing, increased to the value of 73 ± 1 GPa. The tensile yield strength (TYS) of the SPS sample was 730 ± 52 MPa, ultimate tensile strength (UTS) 764 ± 10 MPa, and ductility 22 ± 9%. Annealed samples reached higher values of TYS and UTS (831 ± 60 MPa and 954 ± 48 MPa), but the ductility decreased to the value of 3 ± 1%. The obtained results are discussed considering the observed microstructure of the alloy.
由于商业上使用最多的Ti-6Al-4V合金与骨的弹性模量不同且含有致敏元素，β-Ti合金可能是骨科领域合适的替代材料。放电等离子烧结（SPS）方法对于制备具有极低孔隙率和细晶结构从而具有更高力学性能的材料是可行的。在本研究中，我们采用放电等离子烧结方法制备了四元Ti-25Nb-4Ta-8Sn合金。对该材料进行了热处理，以使结构均匀化，并比较烧结态和退火态的微观结构及性能。SPS样品的弹性模量约为63±1 GPa，退火后增至73±1 GPa。SPS样品的拉伸屈服强度（TYS）为730±52 MPa，极限抗拉强度（UTS）为764±10 MPa，伸长率为22±9%。退火样品的TYS和UTS达到更高值（分别为831±60 MPa和954±48 MPa），但伸长率降至3±1%。结合观察到的合金微观结构对所得结果进行了讨论。
