Low cost corrosion resistant compositionally complex alloys (CCAs)
Abstract
Funds are provided to develop CCAs with commodity metals, such as Al, Zn, Fe, Mn, Cu, Si, Sn experimentally in combination with ther""modynamic calculations, and produce cheap systems based on combinations of mentioned elements that are Ni- or Cr- free using variati""on of Cr or Ti, respectively; evaluate corrosion properties using cyclic polarization and exposure testing in addition to in-depth e""lectrochemical analysis; characterize passive film properties using surface characterization tools, such as X-ray photoelectron spec"troscopy (XPS) and Auger electron spectroscopy (AES); elucidate the feature that govern corrosion resistance of CCAs made of relatively inexpensive alloying elements.The deliverables will be the scientific understanding of the properties and microstructures of th"e CCAs, and newly designed and produced CCAs that are empirically tested.Global cost of corrosion was estimated to be $5.2 trillion" in year 2013 which was equivalent to 3.4% of the global GDP. Application of more corrosion resistant materials is one of the most c"ommon corrosion prevention methodologies. However, high cost of the corrosion resistant materials inhibits their application. Theref""ore, development of cheaper and more corrosion resistant materials is of paramount importance. More recently, compositionally compl""ex alloys (CCAs) has been of great research interest due to their improved properties including high corrosion resistance. However,"" most of the CCAs havebeen based on expensive elements (e.g., Cr, Co, Nb, Mo, Ni, W, V, Y). Some works to date have demonstrated th""at CCAs with commodity elements can also achieve excellent corrosion resistance. To this end, it begs the question: How far can we p""ush the corrosion resistance of CCAs, whilst principally using relatively inexpensive alloying elements? Principle objective of the" proposed project is to develop corrosion resistant CCAs using commodity metals. The corrosion resistance of developed CCAs will see"k to be superior to 316L stainless steel, but at lower raw material cost. The alloy design will be based on the ability of commodity" alloys to form CCAs. Desktop alloy design (using thermodynamic calculations) will guide the selection of the alloying elements. The alloys will be produced by arc melting for testing the properties and the production will be upscaled by additive manufacturing. The microstructure of the CCAs will be studied using advanced material characterization techniques available at the University of Akron and Monash University. Corrosion and mechanical properties will be tested and correlated with the microstructure. Advanced electrochemical techniques in combination with the state-of-the-art surface characterization techniques will develop mechanistic understanding of the corrosion behavior of the CCAs. Deliverables of the project will be newly designed and produced metallic materials. The" design philosophy will be to meet or exceed the corrosion resistance of 316L stainless steel, via use of commodity (comparatively i"nexpensive) elements. The scientific understanding of the properties and microstructure of the CCAs produced will be additional benefits. The project will also have great educational and workforce development impacts. Graduate and undergraduate studentsworking on the project will develop hands-on skills in using advanced experimental technique and abilities to work on multidisciplinary projects applying scientific understanding in the development of advanced materials to meet future technological demands. Outcomes of the project will also be beneficial in teaching and designing new courses on corrosion and alloy development.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 29, 2017
- Source ID
- N000141712807
Entities
People
- Rajeev Gupta
Organizations
- Office of Naval Research
- United States Navy
- University of Akron