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采用粉末冶金模压烧结技术制备了Ti-(2~20)Fe二元合金,探讨了Fe含量对合金的力学性能及耐腐蚀性能的影响,并与铸造CP Ti和Ti-6Al-4V合金的耐腐蚀性能进行了对比。结果表明,随着Fe含量的增加,合金a相含量逐渐降低,b相含量逐渐提高。当Fe含量达到20%时,基本形成单一b相合金。随Fe含量的升高,粉末冶金Ti-(2~20)Fe二元合金的强度及塑性趋于升高,而弹性模量趋于降低。相对而言,Ti-15Fe合金的综合性能最佳,其抗压强度为2702 MPa,压缩率为32.7%,弹性模量为64.6 GPa。随着Fe含量在2%~15%范围内提高,合金的自腐蚀电位正向移动,腐蚀电流密度降低,极化电阻不断增大,腐蚀速率不断降低,耐蚀性能逐渐提高,而Ti-20Fe合金耐腐蚀性能与Ti-15Fe合金接近。Ti-15Fe合金在模拟口腔液(FAS)、磷酸盐缓冲溶液(PBS)、模拟体液(SBF)以及0.9%NaCl溶液(SS)中的腐蚀速率分别为1.7×10~(-3)、7.1×10~(-4)、1.2×10~(-3)和3.5×10~(-4)mm/y。与铸造CP Ti和Ti-6Al-4V合金相比,Ti-15Fe合金具有较正的自腐蚀电位、较小的腐蚀电流密度和腐蚀速率及较大的极化电阻,耐蚀性能明显优于CPTi和Ti-6Al-4V合金。
Ti - (2 ~ 20) Fe binary alloy was prepared by powder metallurgy sintering, and the effect of Fe content on the mechanical properties and corrosion resistance of the alloy was also discussed. Compared with the casting of CP Ti and Ti-6Al-4V alloy Corrosion performance is contrasted. The results show that the content of a phase decreases and the content of b phase increases with the increase of Fe content. When the Fe content reaches 20%, a single b-phase alloy is basically formed. With the increase of Fe content, the strength and plasticity of powder metallurgy Ti- (2-20) Fe binary alloy tend to increase, while the elastic modulus tends to decrease. Relatively speaking, the Ti-15Fe alloy has the best overall performance with a compressive strength of 2702 MPa, a compressibility of 32.7% and a modulus of elasticity of 64.6 GPa. With the increase of Fe content in the range of 2% ~ 15%, the self-corrosion potential of the alloy moves forward, the corrosion current density decreases, the polarization resistance increases, the corrosion rate decreases, and the corrosion resistance gradually increases. However, Alloy corrosion resistance and Ti-15Fe alloy close. The corrosion rates of Ti-15Fe alloy in simulated oral fluid (FAS), phosphate buffered saline (PBS), simulated body fluid (SBF) and 0.9% NaCl solution were 1.7 × 10 -3, 7.1 × 10 ~ (-4), 1.2 × 10 ~ (-3) and 3.5 × 10 ~ (-4) mm / y. Compared with the cast CP Ti and Ti-6Al-4V alloy, Ti-15Fe alloy has a more positive self-corrosion potential, a smaller corrosion current density and corrosion rate and a larger polarization resistance, corrosion resistance significantly better than CPTi And Ti-6Al-4V alloy.