Author
N. Saibaba
Bio: N. Saibaba is an academic researcher from Nuclear Fuel Complex. The author has contributed to research in topics: Microstructure & Alloy. The author has an hindex of 14, co-authored 43 publications receiving 443 citations.
Papers
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TL;DR: In this paper, the development in crystallographic texture and microstructure during the fabrication steps of Zircaloy-4 fuel tube was characterized during fabrication steps, and the development was generalized in terms of 〈 1 0 1 ¯ 0 〉 and (0 − 0 − 0 -1) fibers.
59 citations
TL;DR: In this article, three models, namely Dynamic Materials Model (DMM), modified dynamic materials model (MDMM) and α-parameter, were used to develop processing maps of Zr-2.5Nb alloy.
37 citations
06 May 2014-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the mechanical properties and microstructural characteristics of ultrafine grained Zircaloy-2 processed by cryorolling (CR) were investigated in the present work.
Abstract: The mechanical properties and microstructural characteristics of ultrafine grained Zircaloy-2 processed by cryorolling (CR) were investigated in the present work. The solutionised Zircaloy-2 was rolled at liquid nitrogen temperature (77 K) with different thickness reductions (25–85%). The dislocation density 〈ρ〉 in the cryorolled Zircaloy-2 increases with increasing true strain due to the suppression of dynamic recovery. EBSD analysis of CR Zircaloy-2 revealed initial strain hardening, which has occurred due to activation of { 10 1 ¯ 2 } 〈 1 ¯ 011 〉 tensile and { 11 2 ¯ 2 } 〈 1 ¯ 1 ¯ 23 〉 compressive twins during deformation of samples up to 50% strain. The prismatic and basal slips were activated during subsequent deformation. The fraction of low angle boundaries has increased with increasing true strain up to 50% thickness reduction but the fraction of high angle grain boundaries has increased for CR85% alloy. The CR 85% alloy showed hardness and yield strength values of 282 HV and 891 MPa, respectively. The annealed CR 85% alloy showed higher ductility (9.5% and 11.2% in rolling and transverse direction, respectively) as compared to CR 85% alloy. The annealed Zircaloy-2 showed heterogeneous microstructure consisting of ultrafine grains and nanograins.
28 citations
TL;DR: In this paper, the authors used a binary tree-based model of the polycrystal, which explicitly accounts for grain boundary accommodation and implements the phenomenological extended Voce hardening law for non-twinning single-phase face centered cubic materials.
25 citations
TL;DR: In this paper, the analysis of hot deformation of Zr-2.5Nb with in (α+β) phase field exhibits a domain of dynamic recrystallization, with a peak efficiency of 54-60% at about 750 o C and strain rate is 0.01s -1.
25 citations
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TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.
Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …
33,785 citations
01 Jan 2012
TL;DR: In this article, the twin processes of uniform oxidation and hydrogen embrittlement are described comprehensively in terms of their underlying mechanisms, and the emphasis of this chapter is on uniform oxidisation.
Abstract: When zirconium alloys are used in water-cooled reactors, they are subjected to waterside corrosion. The emphasis of this chapter is on uniform oxidation and hydrogen embrittlement. The twin processes of oxidation and hydriding are described comprehensively in terms of their underlying mechanisms.
153 citations
TL;DR: In this article, the effect of nearest neighboring grains on the propensity for twin growth in Mg and Zr was studied and it was shown that the neighboring grain constraint tends to oppose further growth and that the critical applied stress needed to overcome this resistance depends on neighboring grain orientation.
136 citations
TL;DR: In this paper, a review on the influences of various factors on the moisture susceptibility of WMA mixtures is presented, where the influence of materials and technologies are illustrated, including aggregate, asphalt, compacting temperature and other warm mix technologies.
113 citations