摘要
The effects of thermal treatments on the structure, mechanical properties, wear resistance, and in vitro corrosion protection in artificial saliva(AS) were investigated for a newly developed Ti20 Nb13 Zr(TNZ) alloy. XRD and SEM analyses were used for structural and microstructural analysis. The in vitro corrosion properties of the samples were investigated using electrochemical impedance spectroscopy and linear polarization resistance techniques up to an immersion time of 168 h. The tribological characteristics were evaluated with a linear reciprocating tribometer. SEM analysis showed that solution treatment and aging influenced the size and distribution of α phase. The air-cooled and aged samples exhibited the highest microhardness and macrohardness, for which the wear resistances were 25% and 30% higher than that of the untreated sample, respectively. The cooling rate significantly influenced the corrosion resistance of the TNZ samples. The treated samples showed a reduced corrosion rate(50%) for long immersion time up to 168 h in AS. The furnace-cooled and aged samples exhibited the highest corrosion resistance after 168 h of immersion in AS. Among the treated samples, the aged sample showed enhanced mechanical properties, wear behavior, and in vitro corrosion resistance in AS.
研究热处理对新型Ti20Nb13Zr (TNZ)合金组织、力学性能、耐磨性和人工唾液(AS)体外腐蚀防护性能的影响。采用X射线衍射(XRD)、扫描电镜(SEM)等进行结构和显微组织分析。采用电化学阻抗谱和线性极化电阻技术研究样品在AS中浸泡168 h后的体外耐腐蚀性能。采用线性往复摩擦计对其摩擦特性进行研究。SEM分析结果表明,固溶处理和时效影响α相的尺寸和分布。空冷和时效处理后样品具有最高的显微硬度和宏观硬度,其耐磨性分别比未处理样品高25%和30%。冷却速率对TNZ合金的耐腐蚀性有显著影响。经过处理的样品在AS中浸泡168 h后,腐蚀速率降低50%。经炉冷和时效处理的样品在AS中浸泡168 h后具有最好的耐腐蚀性。在经过处理的样品中,时效样品表现出更优异的力学性能、耐磨性能和体外耐腐蚀性能。
基金
funding support providing by King Fahd University of Petroleum & Minerals through Project (SR161015)。
