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1. A Review on Tribocorrosion Behavior of Aluminum Alloys: From Fundamental Mechanisms to Alloy Design Strategies

   https://doi.org/10.3390/cmd4040031  

   Zhang, Zhengyu; Dandu, Raja_Shekar Bhupal; Klu, Edwin Eyram; Cai, Wenjun (December 2023, Corrosion and Materials Degradation)

   Tribocorrosion, a research field that has been evolving for decades, has gained renewed attention in recent years, driven by increased demand for wear- and corrosion-resistant materials from biomedical implants, nuclear power generation, advanced manufacturing, batteries, marine and offshore industries, etc. In the United States, wear and corrosion are estimated to cost nearly USD 300 billion per year. Among various important structural materials, passive metals such as aluminum alloys are most vulnerable to tribocorrosion due to the wear-accelerated corrosion as a result of passive film removal. Thus, designing aluminum alloys with better tribocorrosion performance is of both scientific and practical importance. This article reviews five decades of research on the tribocorrosion of aluminum alloys, from experimental to computational studies. Special focus is placed on two aspects: (1) The effects of alloying and grain size on the fundamental wear, corrosion, and tribocorrosion mechanisms; and (2) Alloy design strategies to improve the tribocorrosion resistance of aluminum alloys. Finally, the paper sheds light on the current challenges faced and outlines a few future research directions in the field of tribocorrosion of aluminum alloys. 

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2. Vertically aligned carbon nanotubes from premade binary metal oxide nanoparticles on bare SiO2

   https://doi.org/10.1016/j.carbon.2025.120086  

   Hoque, Abdul; Nawarathne, Chaminda P; Alvarez, Noe T (March 2025, Carbon)

   Liu, Chang (Ed.)

   The synthesis of carbon nanotubes (CNTs) requires well-defined catalyst nanoparticles that can influence both diameter and chirality. Herein, catalyst nanoparticles containing both the catalyst and catalyst support material were developed. Bimetallic aluminum oxide–iron oxide (AlOx–Fe2O3) nanorice was synthesized from a mixture containing both aluminum and iron oleate precursors in the solution phase. The nanoparticles were assembled as a monolayer film on a silicon oxide (SiO2) substrate via organic linker molecules to synthesize vertically aligned carbon nanotubes (VA-CNTs). Microscopic and spectroscopic characterization of the premade catalyst nanoparticles and monolayer film assembly revealed the quality of the nanoscale assembly, which facilitated the successful growth of VA-CNTs. The length of the CNTs synthesized using these AlOx–Fe2O3 nanorice catalyst nanoparticles surpassed that of previously reported CNTs grown on bare SiO2 surfaces without oxide buffer layers. In addition, the CNTs appeared to be directly bonded/connected to the SiO2 substrate, suggesting CNT formation via the tip-growth mechanism. The effects of growth temperature and catalyst reduction time were evaluated to obtain high-yield VA-CNTs. 

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3. Corrosion behavior of an in situ consolidated nanocrystalline Al-V alloy

   https://doi.org/10.1038/s41529-022-00225-5  

   Witharamage, C. S.; Christudasjustus, J.; Smith, J.; Gao, W.; Gupta, R. K. (February 2022, npj Materials Degradation)

   Abstract Supersaturated solid solutions of Al and corrosion-resistant alloying elements (M: V, Mo, Cr, Ti, Nb), produced by non-equilibrium processing techniques, have been reported to exhibit high corrosion resistance and strength. The corrosion mechanism for such improved corrosion performance has not been well understood. We present a fundamental understanding of the role of V in corrosion of an Al-V alloy, which will provide a theoretical background for developing corrosion-resistant Al alloys. High-energy ball milling of the elemental powder of Al and V produced an in situ consolidated Al-V alloy, which exhibited high solid solubility of V. The corrosion resistance of Al-V alloy was significantly higher than that of pure Al, which was attributed to the (1) enrichment of V at the passive film/substrate interface, (2) incorporation of V into the passive film, and (3) deposition of V on the iron-containing cathodic particles and therefore, retardation of cathodic reaction. 

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4. Microstructure and corrosion behavior of differently heat-treated Ti-6Al-4V alloy processed by laser powder bed fusion of hydride-dehydride powder

   https://doi.org/10.1016/j.corsci.2023.111495  

   Delpazir, Melody H.; Asherloo, Mohammadreza; Nasiri Khalil Abad, Sajjad; Thompson, Alaina; Guma, Victor; Bagi, Sourabh D.; Sreenivas, Keerthi Kumar; Paliwal, Muktesh; Terry, Jeff; Rollett, Anthony D.; et al (November 2023, Corrosion Science)

   This study investigates the use of hydride-dehydride non-spherical Ti-6Al-4V powders in laser powder bed fusion process and the effects of post-heat-treatments on additively manufactured parts. As-built parts show anisotropic microstructure with α′ martensite and some β phases. Post heat-treated parts exhibit α + β phases, with characteristics dependent on the heat treatment. Heat treatment below β-transus leads to homogenized grain structures with improved corrosion resistance. Electrochemical analysis reveals a very stable corrosion rate due to faster formation of a protective passive layer aided by the fine-structured β phase. X-ray photoelectron spectroscopy examines corrosion behavior and film growth mechanism in saline water. 

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5. FBAR-BASED SENSOR FOR WIRELESS RFID AUTHENTICATION OF INTEGRATED CIRCUITS

   https://doi.org/10.31438/trf.hh2018.53  

   Shkel, Anton; Barekatain, Matin (June 2018, Technical digest - Solid-State Sensor, Actuator, and Microsystems Workshop)

   This paper describes an integrated circuit (IC) authentication and tamper detection system, based on a Film Bulk Acoustic Resonator (FBAR) and passive Radio-Frequency Identification (RFID), which allows for wireless detection of tampering or counterfeiting in packaged ICs. We demonstrate the concept through the use of a 2.6 GHz FBAR based on a Zinc Oxide (ZnO) thin film. The FBAR is series connected to a piezoelectric energy harvester, which can generate voltage pulses with a peak amplitude of 56 V when tampering activity is detected. Our measurements validate this concept and demonstrate that we can permanently alter the high frequency resonance characteristics of the FBAR through dielectric breakdown caused by tampering. 

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