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Powder Metallurgy Production of Ti-2 Wt Pct Si Alloy: Structural, Mechanical, and Electrochemical Characterization of the Sintered Material
Metallurgical and Materials Transactions A ( IF 2.8 ) Pub Date : 2020-10-04 , DOI: 10.1007/s11661-020-06015-5
D. Guzmán , D. Muranda , A. Soliz , C. Aguilar , A. Guzmán , M. Sancy , F. Pineda , P. Rojas

Several commercial alloys use silicon (Si) to improve titanium (Ti) resistance to creep and oxidation at high temperatures and to improve Ti corrosion resistance in acid media. According to the Ti-Si phase diagram, reported stable solid phases in the Ti-rich region are β-Ti, α-Ti, Ti3Si, and Ti5Si3. Nevertheless, very few works in the literature discuss Ti3Si intermetallic production. As such, this work studied the possibility of obtaining an α-Ti-Ti3Si alloy by hot pressing α-Ti supersaturated solid solution powders obtained by mechanical alloying. The consolidation of milled powders was performed using uniaxial hot press equipment. Structural and morphological evolutions during the sintering process were investigated by X-ray diffraction and scanning electron microscopy. Electrochemical behaviors of sintered samples were evaluated by open circuit potential and linear sweep voltammetry. Results show a fine and uniform Ti3Si alloy distribution in the α-Ti matrix produced by the proposed powder metallurgy route. The sintered samples demonstrated high micro-hardness and resistance to sulfuric acid corrosion. Additionally, Ti3Si was shown to have a significant hardening effect on the α-Ti matrix. Electrochemical behavior further demonstrates that a fine and homogeneous Ti3Si distribution in the α-Ti matrix contributes to a more stable superficial oxide layer against sulfuric acid corrosion.



中文翻译:

Ti-2 Wt Pct Si合金的粉末冶金生产:烧结材料的结构,机械和电化学特性

几种商用合金使用硅(Si)来提高钛(Ti)在高温下的抗蠕变性和抗氧化性,并提高在酸性介质中的Ti耐腐蚀性。根据Ti-Si相图,报告的富钛区域中稳定的固相为β -Ti ,α - Ti,Ti 3 Si和Ti 5 Si 3。尽管如此,文献中很少有关于Ti 3 Si金属间化合物生产的著作。这样,这项工作研究了通过热压α获得α -Ti-Ti 3 Si合金的可能性。通过机械合金化制得的-Ti过饱和固溶体粉末。使用单轴热压设备进行研磨粉末的固结。通过X射线衍射和扫描电子显微镜研究了烧结过程中的结构和形态演变。通过开路电势和线性扫描伏安法评估烧结样品的电化学行为。结果表明,通过拟议的粉末冶金路线生产的α- Ti基体中,Ti 3 Si合金的分布均匀且精细。烧结的样品显示出高的显微硬度和耐硫酸腐蚀的能力。此外,Ti 3 Si被证明对α具有显着的硬化作用。-Ti矩阵。电化学行为进一步表明,α- Ti基体中精细且均匀的Ti 3 Si分布有助于形成更稳定的表面硫酸层,以抵抗硫酸腐蚀。

更新日期:2020-10-04
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