A5069093946- High Temperature Alloys and Creep
- Advanced Materials Characterization Techniques
- Intermetallics and Advanced Alloy Properties
- High Entropy Alloys Studies
- Microstructure and Mechanical Properties of Steels
- Microstructure and mechanical properties
- Nuclear Materials and Properties
- High-Temperature Coating Behaviors
- Additive Manufacturing Materials and Processes
- Titanium Alloys Microstructure and Properties
- Hydrogen embrittlement and corrosion behaviors in metals
- Wood Treatment and Properties
- Material Properties and Processing
- Natural Fiber Reinforced Composites
- Aluminum Alloy Microstructure Properties
The Ohio State University
2019-2024
University of Maine
1998
Abstract Almost 75 years of research has been devoted to producing superalloys capable higher operating temperatures in jet turbine engines, and there is an ongoing need increase temperature further. Here, a new disk Nickel-base superalloy designed take advantage strengthening atomic-scale dynamic complexions. This local phase transformation provides the alloy with three times improvement creep strength over similar comparable single crystal blade at 760 °C. Ultra-high-resolution chemical...
Abstract Creep strength in polycrystalline Ni-based superalloys is influenced by the formation of a rich variety planar faults forming within strengthening $$\gamma '$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>γ</mml:mi> <mml:mo>′</mml:mo> </mml:msup> </mml:math> phase. The lengthening and thickening rate these – therefore creep depends on an intriguing combination dislocation interactions at $$ - interface diffusional processes alloying elements core...
The microstructure evolution due to the tensile deformation of equiatomic quinary high-entropy alloy Ho-Dy-Y-Gd-Tb (HEA-Fb) is assessed. HEA-Fb has extraordinarily similar alloying elements. It one few hexagonal-close-packed single-phase representatives HEA. compared quaternary medium-entropy (MEA) Ho-Dy-Gd-Tb with no Y (4-Y). For a hexagonal HEA, in contrast cubic little information on plastic and underlying mechanisms available. A detailed study using electron microscopy-based multi-scale...
In this study, two similar, commercial polycrystalline Ni-based disk superalloys (LSHR and ME3) were creep tested at 760°C 552MPa to approximately 0.3% plastic strain. LSHR consistently displayed superior properties stress/temperature regime even though the microstructural characteristics between alloys comparable. High resolution structural chemical analysis, however, revealed significant differences among active gamma prime shearing modes involving superlattice intrinsic extrinsic stacking...
This work investigated two similar polycrystalline alloys, differing by only 1 at% Nb content, which elucidated its effect on local phase transformation strengthening during high temperature creep. Compression creep tests were conducted at 750 °C and 600 MPa to 0.5% strain, resulting in deformation dominated microtwinning. Higher alloy RRHT5 exhibited superior strength RRHT3 terms of minimum rate. The microstructures characterized via atomic resolution scanning transmission electron...
Abstract Single fiber fracture is important in understanding the fundamental failure mechanisms wood/polymer composite products such as medium density fiberboard (MDF). The mechanical properties and behavior of individual wood fibers has only recently been observable using a combination environmental scanning electron microscopy (ESEM), laser confocal digital image correlation (DIC). Previous work shown that specific areas on microcompressions pits acted crack nucelators induce brash across...