Helmer Alexander, Agrawal Rahul, Mugale Manoj, Borkar Tushar, Gupta Rajeev
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27606, USA.
Mechanical Engineering Department, Cleveland State University, Cleveland, OH 44115, USA.
Materials (Basel). 2025 Jul 11;18(14):3279. doi: 10.3390/ma18143279.
Magnesium-containing multi-principal element alloys (MPEAs) are promising for lightweight applications due to their low density, high specific strength, and biocompatibility. This study examines two Mg-Ti-Zn alloy compositions, equal molar MgTiZn (TZ) and MgTiZn (4TZ), synthesized via ball milling followed by spark plasma sintering, focusing on their microstructures and corrosion behaviors. X-ray diffraction and transmission electron microscopy revealed the formation of intermetallic phases, including TiZn and MgZn in TZ, while 4TZ exhibited a predominantly Mg-rich phase. Potentiodynamic polarization and immersion tests in 0.1 M NaCl solution showed that both alloys had good corrosion resistance, with values of 3.65 ± 0.65 µA/cm for TZ and 4.58 ± 1.64 µA/cm for 4TZ. This was attributed to the formation of a TiO-rich surface film in the TZ, as confirmed by X-ray photoelectron spectroscopy (XPS), which contributed to enhanced passivation and lower corrosion current density. Both alloys displayed high hardness, 5.5 ± 1.0 GPa for TZ and 5.1 ± 0.9 GPa for 4TZ, and high stiffness, with Young's modulus values of 98.2 ± 11.2 GPa for TZ and 100.8 ± 9.6 GPa for 4TZ. These findings highlight the potential of incorporating Ti and Zn via mechanical alloying to improve the corrosion resistance of Mg-containing MPEAs and Mg-based alloys.
含镁多主元合金（MPEAs）因其低密度、高比强度和生物相容性，在轻量化应用方面颇具前景。本研究考察了通过球磨后进行放电等离子烧结合成的两种Mg-Ti-Zn合金成分，即等摩尔的MgTiZn（TZ）和MgTiZn（4TZ），重点关注它们的微观结构和腐蚀行为。X射线衍射和透射电子显微镜揭示了金属间相的形成，包括TZ中的TiZn和MgZn，而4TZ主要呈现富镁相。在0.1 M NaCl溶液中的动电位极化和浸泡试验表明，两种合金都具有良好的耐腐蚀性，TZ的腐蚀电流密度值为3.65±0.65 µA/cm，4TZ为4.58±1.64 µA/cm。这归因于TZ中形成了富含TiO的表面膜，X射线光电子能谱（XPS）证实了这一点，该表面膜有助于增强钝化作用并降低腐蚀电流密度。两种合金都表现出高硬度，TZ为5.5±1.0 GPa，4TZ为5.1±0.9 GPa，且具有高刚度，TZ的杨氏模量值为98.2±11.2 GPa，4TZ为100.8±9.6 GPa。这些发现凸显了通过机械合金化引入Ti和Zn来提高含镁MPEAs和镁基合金耐腐蚀性的潜力。
