Author
Gopal B. Viswanathan
Other affiliations: Ruhr University Bochum, University of Paris, Wright-Patterson Air Force Base
Bio: Gopal B. Viswanathan is an academic researcher from Ohio State University. The author has contributed to research in topics: Creep & Superalloy. The author has an hindex of 29, co-authored 85 publications receiving 2835 citations. Previous affiliations of Gopal B. Viswanathan include Ruhr University Bochum & University of Paris.
Papers published on a yearly basis
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TL;DR: In this paper, a Burgers orientation relationship between the α and the β phases has been assumed to allow for easy slip transmission across the α/β interfaces, and a simple model is presented based on the accumulation of residual dislocations at both the α /β interface and the α matrix, which provides insight into the mechanism of slip transmission, strain hardening and primary creep of these colony structures.
287 citations
TL;DR: In this paper, the relationship between the morphology and crystallography of Widmanstatten plates of α-Ti in colonies within a prior grain of β-Ti was examined for α/β-Ti alloys.
266 citations
TL;DR: In this article, the authors investigated the deformation properties of the superalloy Rene 88 DT alloys with small-strain (0.2-0.5%) creep at 650°C using conventional and high-resolution transmission electron microscopy.
232 citations
TL;DR: In this paper, the relationship between the crystallographic orientations and growth directions of grain boundary-allotriomorphic-α and secondary Widmanstatten α laths growing from the GB α at grain boundaries separating β grains with specific misorientations has been examined.
152 citations
TL;DR: In this article, a supersolvus treatment of Rene 88 DT samples was subjected to different cooling rates and aged for varying periods of time from 25 to 200h at 760°C.
150 citations
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Journal Article•
28,685 citations
TL;DR: High entropy alloys (HEAs) are barely 12 years old as discussed by the authors, and the field has stimulated new ideas and inspired the exploration of the vast composition space offered by multi-principal element alloys.
4,693 citations
TL;DR: A comprehensive review of the main 3D printing methods, materials and their development in trending applications was carried out in this paper, where the revolutionary applications of AM in biomedical, aerospace, buildings and protective structures were discussed.
Abstract: Freedom of design, mass customisation, waste minimisation and the ability to manufacture complex structures, as well as fast prototyping, are the main benefits of additive manufacturing (AM) or 3D printing. A comprehensive review of the main 3D printing methods, materials and their development in trending applications was carried out. In particular, the revolutionary applications of AM in biomedical, aerospace, buildings and protective structures were discussed. The current state of materials development, including metal alloys, polymer composites, ceramics and concrete, was presented. In addition, this paper discussed the main processing challenges with void formation, anisotropic behaviour, the limitation of computer design and layer-by-layer appearance. Overall, this paper gives an overview of 3D printing, including a survey on its benefits and drawbacks as a benchmark for future research and development.
4,159 citations
TL;DR: In this paper, the complexity and variety of fundamental phenomena in this material system with a focus on phase transformations and mechanical behaviour are discussed. And the challenges that lie ahead in achieving these goals are delineated.
1,797 citations
TL;DR: In this article, the authors reviewed open literature publications on refractory high entropy alloys (RHEAs) and refractor complex concentrated alloys(RCCAs) in the period from 2010 to the end of January 2018.
Abstract: Open literature publications, in the period from 2010 to the end of January 2018, on refractory high entropy alloys (RHEAs) and refractory complex concentrated alloys (RCCAs) are reviewed. While RHEAs, by original definition, are alloys consisting of five or more principal elements with the concentration of each of these elements between 5 and 35 at.%, RCCAs can contain three or more principal elements and the element concentration can be greater than 35%. The 151 reported RHEAs/RCCAs are analyzed based on their composition, processing methods, microstructures, and phases. Mechanical properties, strengthening and deformation mechanisms, oxidation, and corrosion behavior, as well as tribology, of RHEA/RCCAs are summarized. Unique properties of some of these alloys make them promising candidates for high temperature applications beyond Ni-based superalloys and/or conventional refractory alloys. Methods of development and exploration, future directions of research and development, and potential applications of RHEAs are discussed.
778 citations