Environmental Degradation of Multiple Principal Component Materials: On-Demand Oral Presentations
Sponsored by: TMS Structural Materials Division, TMS: Corrosion and Environmental Effects Committee, TMS: Nuclear Materials Committee
Program Organizers: Wenjun Cai, Virginia Polytechnic Institute and State University; ShinYoung Kang, Lawrence Livermore National Laboratory; XiaoXiang Yu, Novelis Inc.; Vilupanur Ravi, California State Polytechnic University Pomona; Christopher Weinberger, Colorado State University; Elizabeth Opila, University of Virginia; Bai Cui, University of Nebraska Lincoln; Mark Weaver, University of Alabama; Bronislava Gorr, Karlsruhe Institute of Technology (KIT); Srujan Rokkam, Advanced Cooling Technologies, Inc.
Monday 8:00 AM
March 14, 2022
Room: Corrosion
Location: On-Demand Room
Hydrogen Embrittlement Behavior of Face-centered Cubic High-entropy Alloys: Hong Luo1; Zhimin Pan2; Yu Fu2; Xiaogang Li2; 1Max-Planck-Institut für Eisenforschung; 2University of Science and Technology Beijing
It is known to all that hydrogen embrittlement of metallic materials has plagued the scientific community for many years. Compared to other metallic materials, high-entropy alloys show excellent properties such as high hardness, high strength, heat resistance, and corrosion resistance. Up to now, there is little information focus on hydrogen induced degradation of high-entropy alloys. The influence of hydrogen on the mechanical and deformation behavior of several face-centered cubic high-entropy alloys was examined through tensile tests, EBSD, ECCI. The tensile ductility was reduced by hydrogen charging. The failure mode of the interstitial HEA in presence of hydrogen was a combination of intergranular and transgranular fracture as well as microvoid coalescence. Moreover, the reasons for this were further discussed.
Cancelled
Nonequilibrium Solute Capture in Complex Alloys: Laurence Marks1; 1Northwestern University
It has recently become clear that many oxidation processes, both in aqueous conditions and at high temperatures do not follow simple thermodynamics. Instead Nonequilibrium Solute Capture plays a critical role, the both the oxide crystallography as well as the composition controlled by kinetics coupled with thermodynamics. While this was first observed in simpler systems such as the oxidation of NiCr alloys, there is now mounting evidence for it in many other cases. This talk will look at some of the consequences for multicomponent alloys, particularly when nonequilibrium is coupled with the direction of diffusion of point defects, as well as effects due to supersaturation of oxygen inside alloys during fast growth.
Microstructure and Corrosion of Multi-phase Ni-Fe-Cr-Mo-W-X Multi-principal Element Alloys: Anup Panindre1; Henk Colijn1; Babu Viswanathan1; Carley Goodwin1; Daniel Huber1; Christopher Taylor1; Gerald Frankel1; 1Ohio State University
The design and corrosion resistance of single-phase Ni-Fe-Cr-Mo-W-X (X=Ru, Mn, Al, and Cu) MPEAs has been recently reported. In this study, these alloys were heat treated at 800 °C for up to 160 h starting from the solutionized single-phase to allow precipitation of secondary phases that provide increased hardness and strength. During heat treatment at 800 °C, σ-phase rich in Cr, Ru, Mo and W precipitated in each alloy. After aging, the hardness of the MPEAs containing Ru and Al showed the most significant increase in hardness, about 60 and 90 % respectively, due to the precipitation. Some of the MPEAs were found to resist localized corrosion after the aging heat treatment. While the Ru-containing MPEA was resistant to localized corrosion at temperatures up to 80 °C, the ones containing Mn, Cu or Al became susceptible to localized breakdown at the interface between the matrix and precipitate at ambient temperatures.
Corrosion Interactions between a Candidate Hollandite Waste Form and Stainless Steel: Chandi Mohanty1; Keith Bryce2; Xiaolei Guo1; Kun Yang2; Jie Lian2; Jianwei Wang3; Gerald Frankel1; 1The Ohio State University; 2Rensselaer Polytechnic Institute; 3Louisiana State University
The static leaching characteristics of Ba from barium hollandite with targeted composition BaFe2Ti6 O16 was studied in intimate contact with stainless steel (SS) 316L in a 0.6M NaCl solution. The synthesized hollandite waste form was characterized by XRD, Raman spectroscopy and SEM. Localized corrosion of SS enhances the leaching of the hollandite waste form by creating a low pH environment in the tight crevice formed between the two materials. The corroded hollandite surface consists of a discontinuous and highly porous Fe-Ti rich layer with minor amounts of Ba. Raman spectroscopy shows that hollandite leaching leads to an increase in the amount of rutile phase due to preferential leaching of Ba from the A site. Evidence from XPS shows the oxidation of Ti3+ to Ti4+ with breaking of the A-site channel, which facilitates Ba leaching.
Experimental and Numerical Assessment of the Corrosion Behavior of a Friction Stir Processed Equiatomic CrMnFeCoNi High Entropy Alloy in a Neutral Environment: Sam Anaman1; Solomon Ansah1; Sung-Tae Hong2; Min-Gu Jo3; Jin-Yoo Suh3; Heung Nam Han4; Minjung Kang5; Jong-Sook Lee6; Hoon-Hwe Cho1; 1Hanbat National University; 2University of Ulsan; 3Korea Institute of Science and Technology; 4Seoul National University; 5Korea Institute of Industrial Technology; 6Chonnam National University
The corrosion behavior of a friction stir processed (FSPed) equiatomic CrMnFeCoNi high-entropy alloy (HEA) is investigated in an aerated 0.5 M Na2SO4 electrolyte solution at room temperature. The microstructural analysis reveals a highly refined stir zone (SZ) with an average grain size that decreases from the top region of the SZ to the bottom region of the SZ. Grain refinement in the SZ enhances the rapid formation of the passive layer leading to better corrosion properties of the FSPed HEA. Pitting corrosion behavior of the FSPed HEA is predicted to be influenced by the micro-galvanic nature of the HEA, leading to increase in polarization at the anodic sites (pits). A numerical model is established to simulate the pitting corrosion behavior on the surface of the FSPed HEA in a neutral environment.
Development of a New Aluminum Dissolvable Alloy for Hydraulic Fracturing Applications: Ezz Ahmed1; Hani Henein1; Ahmed Qureshi1; Jing Liu1; 1University of Alberta
This study aims to develop a new dissolvable material based on aluminum alloys (AA) with strong mechanical properties and good dissolvability for downhole applications. Taguchi’s method will be utilized to change the chemistry of AA 7075 by adding various elements (such as Cu, Ga, Ag, Sn, In, Zn, Cr, and Zr). First, the Scheil-Gulliver model will be used to simulate the solidification process to target the chemistries of candidate alloys. AA 7075 and the chosen metal elements will then be melted using an induction furnace. The as-prepared AA ingots will be characterized through X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and Vickers hardness testing. The relationship between alloy chemistry, phase fractions and the designed AAs’ microstructure will be determined. It is believed that the design approach and characterization methods employed in the work will facilitate the development of the most promising dissolvable AA for hydraulic fracturing applications.