CAREER: Effects of Alloy Concentration on the Tribocorrosion Resistance of Al-TM Supersaturated Solid Solutions

事业：合金浓度对 Al-TM 过饱和固溶体耐摩擦腐蚀性能的影响

• 批准号: 1856196
• 负责人: Wenjun Cai
• 金额: $ 31.25万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-08-10 至 2021-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1856196&HistoricalAwards=false
• 关键词: CAREER; Effects; Alloy; Concentration; Tribocorrosion

NON-TECHNICAL DESCRIPTION: Tribocorrosion is a material degradation process caused by the combined effects of wear and corrosion. It is a research area that emerged recently, driven by increased demand for wear- and corrosion-resistant materials from biomedical implants, nuclear power generation, marine and offshore industries, etc. The complexity of tribocorrosion lies in the fact that the chemical and mechanical attacks act synergistically to cause accelerated failure. The synergetic effect is most prominent for passive metals, such as stainless steels, titanium and aluminum alloys, which rely on the presence of a thin surface oxide film (passive film) as a protective barrier against corrosion. When mechanical wear takes place during corrosion, the passive film can be locally destroyed, with the ensuing depassivation leading to rapid corrosion and early component failure. This research seeks to offer insight concerning the degradation mechanisms during tribocorrosion of passive metals using experiments and modeling. The obtained results can lead to the development of new tribocorrosion resistant alloys and coatings with enhanced durability. Research opportunities and a mentorship program are created for undergraduate students and under-represented minorities. Relevant core undergraduate courses are updated to include tribocorrosion-related topics. The outreach program features hands-on demonstrations for girls in elementary and middle schools from Pinellas County, Florida, to stimulate their interest in STEM fields. Published and promoted videos demonstrating the physical concepts related to this research are on popular social media platforms to educate a broad and diverse audience about tribocorrosion. TECHNICAL DETAILS: Al exhibits excellent corrosion resistance but poor scratch resistance, which greatly limits its potential usage in industrial applications where mechanical contact and corrosive environment coexist. Recent studies from our group demonstrates that alloying Al with a transition metal (TM) in supersaturated solid solution has the potential of simultaneously increasing the wear resistance of Al alloys as well as the protectiveness of the passive layer, thus improving the overall tribocorrosion resistance. This research project is directed towards identifying how alloy concentration affects deformation and degradation during tribocorrosion and is centered on a comprehensive study that integrates material processing, characterization, tribocorrosion testing, and theoretical modeling. The proposed processing technique produces materials with various alloy concentrations while minimizing crystallographic texture and residual stress effects. Materials are characterized site-specifically to evaluate the microstructural modifications induced by different degradation mechanisms during tribocorrosion, including wear and corrosion and their synergistic and stochastic aspects. The specific technical objectives include (1) establishment of the alloy concentration/tribocorrosion resistance relationship for Al-TMs, (2) determination of whether an optimum alloy concentration exists for the best tribocorrosion resistance, and (3) investigation of whether (and how) in-service conditions (e.g., applied load, sliding speed) and corrosion conditions influence the tribocorrosion resistance. The obtained results help establish better guidelines for the application of metals in harsh environments and service conditions. The findings also serve to improve design principles for new tribocorrosion-resistant Al alloys, the use of which presents great potential for increasing the sustainability of global energy consumption.

非技术描述：摩擦腐蚀是由磨损和腐蚀的综合作用引起的材料降解过程。这是最近出现的一个研究领域，受到生物医学植入物，核能发电，海洋和海上工业等对耐磨和耐腐蚀材料需求增加的推动。摩擦腐蚀的复杂性在于化学和机械攻击协同作用导致加速失效。对于钝化金属，如不锈钢、钛和铝合金，协同效应最为突出，这些金属依赖于薄表面氧化膜（钝化膜）的存在作为防腐蚀的保护屏障。当腐蚀过程中发生机械磨损时，钝化膜可能会局部破坏，随之而来的去钝化导致快速腐蚀和早期部件失效。本研究旨在通过实验和建模提供有关钝化金属摩擦腐蚀过程中的降解机制的见解。所获得的结果可以导致新的耐摩擦腐蚀合金和涂层的开发具有增强的耐久性。为本科生和代表性不足的少数民族创造了研究机会和导师计划。相关的核心本科课程更新，包括摩擦腐蚀相关的主题。该推广计划的特点是为来自佛罗里达皮内拉斯县的小学和中学的女孩进行动手示范，以激发她们对STEM领域的兴趣。在流行的社交媒体平台上发布和推广的视频展示了与本研究相关的物理概念，以教育广泛而多样化的观众了解摩擦腐蚀。技术规格：铝具有优异的耐腐蚀性，但耐刮擦性差，这极大地限制了其在机械接触和腐蚀环境共存的工业应用中的潜在用途。我们小组最近的研究表明，在过饱和固溶体中将Al与过渡金属（TM）合金化具有同时提高Al合金的耐磨性和钝化层的保护性的潜力，从而提高整体的耐摩擦腐蚀性。该研究项目旨在确定合金浓度如何影响摩擦腐蚀过程中的变形和降解，并以综合研究为中心，整合材料加工，表征，摩擦腐蚀测试和理论建模。所提出的处理技术产生具有各种合金浓度的材料，同时最小化晶体织构和残余应力效应。材料的特点是现场特定的摩擦腐蚀过程中，不同的降解机制，包括磨损和腐蚀及其协同和随机方面引起的微观结构的修改进行评估。具体的技术目标包括（1）建立Al-TM的合金浓度/耐摩擦腐蚀性关系，（2）确定是否存在最佳合金浓度以获得最佳耐摩擦腐蚀性，以及（3）研究是否（以及如何）使用条件（例如，施加的载荷、滑动速度）和腐蚀条件影响耐摩擦腐蚀性。所获得的结果有助于为恶劣环境和服务条件下的金属应用建立更好的指导方针。研究结果还有助于改进新型耐摩擦腐蚀铝合金的设计原则，该合金的使用为提高全球能源消耗的可持续性提供了巨大潜力。

项目成果

Influence of chemical heterogeneity and microstructure on the corrosion resistance of biodegradable WE43 magnesium alloys

• DOI: 10.1039/c9tb00388f
• 发表时间: 2019-11-07
• 期刊: JOURNAL OF MATERIALS CHEMISTRY B
• 影响因子: 7
• 作者: Mraied, Hesham;Wang, Wenbo;Cai, Wenjun
• 通讯作者: Cai, Wenjun

Effects of nanoscale chemical heterogeneity on the wear, corrosion, and tribocorrosion resistance of Zr-based thin film metallic glasses

• DOI: 10.1016/j.surfcoat.2020.126324
• 发表时间: 2020-11-25
• 期刊: SURFACE & COATINGS TECHNOLOGY
• 影响因子: 5.4
• 作者: Wang, Wenbo;Mraied, Hesham;Cai, Wenjun
• 通讯作者: Cai, Wenjun

The origin of passivity in aluminum-manganese solid solutions

• DOI: 10.1016/j.corsci.2020.108749
• 发表时间: 2020-08-15
• 期刊: CORROSION SCIENCE
• 影响因子: 8.3
• 作者: Chen, Jia;Xiao, Jianwei;Cai, Wenjun
• 通讯作者: Cai, Wenjun

Probing the subsurface lattice rotation dynamics in bronze after sliding wear

• DOI: 10.1016/j.scriptamat.2019.07.002
• 发表时间: 2019-11-01
• 期刊: SCRIPTA MATERIALIA
• 影响因子: 6
• 作者: Cai, W.;Bellon, P.;Beaudoin, A. J.
• 通讯作者: Beaudoin, A. J.

Modeling the effects of individual layer thickness and orientation on the tribocorrosion behavior of Al/Cu nanostructured metallic multilayers

• DOI: 10.1016/j.wear.2021.203849
• 发表时间: 2021-03
• 期刊: Wear
• 影响因子: 5
• 作者: Kaiwen Wang;W. Cai