Author
R.A. Holt
Other affiliations: Atomic Energy of Canada Limited, Chalk River Laboratories
Bio: R.A. Holt is an academic researcher from Queen's University. The author has contributed to research in topics: Creep & Zirconium alloy. The author has an hindex of 26, co-authored 73 publications receiving 1642 citations. Previous affiliations of R.A. Holt include Atomic Energy of Canada Limited & Chalk River Laboratories.
Papers published on a yearly basis
Papers
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TL;DR: In this paper, two different Widmanstatten morphologies have been observed in nominally similar Zircaloy-4.5, showing that some of the particles are NaCl cubic structure with a lattice parameter of 5.25 A which corresponds to zirconium phosphide.
107 citations
TL;DR: In situ phase transformation experiments have been carried out using neutron diffraction to monitor the texture evolution during the α → β → α phase transformation in a common zirconium alloy as mentioned in this paper.
99 citations
TL;DR: In this article, the authors used X-ray diffraction (XRD) and transmission electron microscopy (TEM) to characterize microstructural and microchemical changes produced by irradiation in nuclear reactor core components fabricated from Zircaloy-2 and -4.
75 citations
TL;DR: In this article, the effects of extrusion variables on the crystallographic texture of Zr-2.5% Nb tubes extruded in the α + β phase field were described.
68 citations
TL;DR: In this paper, the authors considered the nature of the Fe-enhancement mechanism in terms of vacancies strongly bound to either substitutional or interstitial Fe atoms and concluded that the experimentally observed substitutional diffusion enhancements are most readily interpreted as transport via an inter-stitial Fe/vacancy pair.
67 citations
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TL;DR: In this paper, the authors investigated the effects of deformation twinning on various aspects of plastic deformation, including the anisotropic strain-hardening rates, the tension/compression yield asymmetry, and the evolution of crystallographic texture.
565 citations
TL;DR: In this paper, the internal strains within a polycrystalline magnesium alloy plate have been measured during tensile and compression testing in situ by neutron diffraction using an elasto-plastic self-consistent simulation code.
522 citations
TL;DR: In recent years, major advances have taken place in our understanding of welding processes and welded materials because of the complexity of fusion welding processes, solution of many important contemporary problems in fusion welding requires an interdisciplinary approach as mentioned in this paper.
Abstract: In recent years, major advances have taken place in our understanding of welding processes and welded materials Because of the complexity of fusion welding processes, solution of many important contemporary problems in fusion welding requires an interdisciplinary approach Current problems and issues in fusion welding are reviewed Solution of these problems, apart from being a contribution to the advancement of science, is also necessary for science-based tailoring of composition, structure, and properties of the welded materials
454 citations
TL;DR: In this article, the development, fabrication, microstructures, and properties of MGMCs, including the room-temperature, cryogenictemperature and hightemperature mechanical properties upon quasi-static and dynamic loadings are reviewed.
Abstract: The mechanical properties of ex-situ and in-situ metallic glass matrix composites (MGMCs) have proven to be both scientifically unique and of potentially important for practical applications. However, the underlying deformation mechanisms remain to be studied. In this article, we review the development, fabrication, microstructures, and properties of MGMCs, including the room-temperature, cryogenic-temperature, and high-temperature mechanical properties upon quasi-static and dynamic loadings. In parallel, the deformation mechanisms are experimentally and theoretically explored. Moreover, the fatigue, corrosion, and wear behaviors of MGMCs are discussed. Finally, the potential applications and important unresolved issues are identified and discussed.
409 citations
15 Jun 2005-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the development of a twinned microstructure in hexagonal close-packed rolled magnesium compressed in the in-plane direction has been monitored in situ with neutron diffraction.
Abstract: The development of a twinned microstructure in hexagonal close-packed rolled magnesium compressed in the in-plane direction has been monitored in situ with neutron diffraction. The continuous conversion of the parent to daughter microstructure is tracked through the variation of diffraction peak intensities corresponding to each. Approximately 80% of the parent microstructure twins by 8% compression. Elastic lattice strain measurements indicate that the stress in the newly formed twins (daughters) is relaxed relative to the stress field in the surrounding matrix. However, since the daughters are in a plastically “hard” deformation orientation, they quickly accumulate elastic strain as surrounding grains deform plastically. Polycrystal modeling of the deformation process provides insight about the crystallographic deformation mechanism involved.
399 citations