Experimental and theoretical study of the effect of Si on the oxidative behavior of Ti-6Al-4V alloys
Experimental and theoretical study of the effect of Si on the oxidative behavior of Ti-6Al-4V alloys
复制标题
Si对Ti-6Al-4V合金氧化行为影响的实验与理论研究
DOI：
10.1016/j.jallcom.2018.10.291
复制
发表时间：
2019
影响因子：
6.2
通讯作者：
T. Narushima
中科院分区：
文献类型：
--
作者：
K. Maeda;Satoshi Suzuki;Kyosuke Ueda;T. Kitashima;S. Bhattacharya;R. Sahara;T. Narushima
本文首次研究了含硅Ti-6Al-4V合金在空气中的氧化行为。合金在910-1210 K的温度范围内进行了研究，最大时间为518.4 ks，并报告了它们在室温下的拉伸性能。Si的加入降低了氧化过程中的总质量增加，并扩大了质量增加服从抛物线速率定律的区域。氧化膜主要由金红石和α-Al 2 O3相组成。XPS分析结果表明，在金红石中，Si以Si 4+和SiO2两种形式存在。第一性原理计算表明，Si ~（4+）离子稳定地溶解在金红石的间隙中，通过减少氧空位的数量来抑制氧通过金红石的迁移，从而抑制氧化皮的形成。Ti-1mass%Si合金表面由Ti_3Al和α″相组成的反应层抑制了氧向基体中的溶解，α-壳形成。在1010 K和1110 K氧化过程中，α-壳形成的质量增加与总质量增加的比率在0.077到0.42之间。Ti-6Al-4V合金中添加Si可有效提高其抗氧化性和拉伸强度。
This paper reports the first study of the oxidative behavior of Si-containing Ti-6Al-4V alloys in air. The alloys were studied in the temperature range 910–1210 K for a maximum period of 518.4 ks, and their tensile properties at room temperature are reported. The addition of Si decreased the total mass gain during oxidation and enlarged the region in which the mass gain obeyed the parabolic rate law. The oxide scale mainly consisted of rutile and α-Al2O3phases. The results of the XPS analysis suggest that in rutile, Si exists as both Si4+ions and SiO2. First-principles calculations indicated that Si4+ions stably dissolved into the interstitial sites in rutile, which suppresses oxygen migration through rutile by decreasing the number of oxygen vacancies, thereby inhibiting oxide scale formation. The reaction layer consisting of Ti3Al and α″ phases on Ti-1mass% Si alloy suppressed the dissolution of oxygen into the substrate, i.e., α-case formation. The ratio of mass gain in α-case formation to total mass gain during oxidation at 1010 K and 1110 K ranged from 0.077 to 0.42. The addition of Si to the Ti-6Al-4V alloy was effective in improving both its oxidative resistance and tensile strength.