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  1. Article

    Open Access

    Understanding the Subsurface Microstructure and Thermal Behavior of Model Oxide Dispersion Strengthened Alloys Through FIB_SEM and TEM

    A potential but an underexplored application of FIB_SEM is its ability to image the subsurface microstructure and capability for an associated chemical analysis. In this article, agglomerated microstructures o...

    K. G. Raghavendra, M. Sivakumar… in Metallography, Microstructure, and Analysis (2024)

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    Article

    Quantification of Shear Strain Development in the Through-Thickness Direction During Sliding Wear

    Quantifying strain in a deformation mechanism like wear can be critical to enhancing knowledge on structure–property correlation, especially for systems that show strain-induced phase transformations. In this ...

    Suruj Protim Neog, Akhil G. Nair… in Metallurgical and Materials Transactions A (2023)

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    Article

    The Defining Role of Micro-fissures on the Mechanical Behavior of Laser-Welded Fully Austenitic Stainless Steel

    Laser-welded fully austenitic stainless steel (AISI 316LN) weldments revealed the presence of micro-fissures. They appeared at the grain boundaries, near the center of the welds. The grain boundaries, however,...

    Arnab Sarkar, Soudip Basu… in Metallurgical and Materials Transactions A (2022)

  4. No Access

    Article

    Structure and Texture of Oxide Dispersion Strengthened Alloy 617 for Very High Temperature Applications

    High energy mechanically milled Alloy 617 ODS powder was consolidated by Spark Plasma Sintering (SPS) technique and subsequently annealed at 650 °C and 1050 °C (923 K and 1323 K). Microstructure and microtextu...

    M. Sivakumar, Shyam Kanta Sinha… in Metallurgical and Materials Transactions A (2021)

  5. No Access

    Article

    Controlling the morphology of nanocrystalline Y(OH)3 powders synthesized by microwave-hydrothermal route and effect of annealing

    Y(OH)3 is the main precursor material to inherit desirable morphologies for Y2O3. The Y(OH)3 and Y2O3 are an important substitution for luminescent matrix and useful in temperature sensing applications. Nanostruc...

    Thirupathi Gadipelly, Arup Dasgupta, D. Sornadurai, Sandip Dhara in Applied Physics A (2021)

  6. No Access

    Article

    Microstructural Evolution of Nanocrystalline ZrO2 in a Fe Matrix During High-Temperature Exposure

    The current study examines the evolution of nanocrystallites of ZrO2 with time and temperature in a Fe-ZrO2 composite. The crystallite sizes were determined through X-ray peak broadening analysis by the Williamso...

    K. G. Raghavendra, Arup Dasgupta… in Metallurgical and Materials Transactions A (2018)

  7. No Access

    Article

    Effect of Annealing Treatment on Σ3-Type CSL Boundaries and Its Interactions in 304HCu Grade Austenitic Stainless Steel

    This paper presents the results of a study on grain boundary characteristics in cold deformed and annealed 304HCu grade austenitic stainless steel (SS 304HCu) using electron backscatter diffraction. The micros...

    Manmath Kumar Dash, R. Mythili, Arup Dasgupta… in Metallurgical and Materials Transactions A (2018)

  8. No Access

    Article

    Effect of Laser Surface Melting on the Microstructure and Pitting Corrosion Resistance of 304L SS Weldment

    The manuscript presents the effect of laser surface melting (LSM) on the microstructural variations and pitting corrosion resistance of 304L SS weldment fabricated by gas tungsten arc welding of 304L SS plates...

    Girija Suresh, Arup Dasgupta… in Metallurgical and Materials Transactions B (2017)

  9. No Access

    Article

    Surface optical phonon modes in hexagonal shaped Al0.97Ga0.03N nanostructures

    Raman modes of plasma assisted molecular beam epitaxy grown, c-plane oriented and hexagonal shaped cylindrical Al0.97Ga0.03N nanostructures are reported. Apart from the group theoretically allowed optical phonons...

    A. K. Sivadasan, Chirantan Singha, K. G. Raghavendra… in Applied Physics A (2017)

  10. No Access

    Article

    Study of Aging-Induced Degradation of Fracture Resistance of Alloy 617 Toward High-Temperature Applications

    For the Alloy 617, the effect of aging on the fracture energy degradation has been investigated after aging for different time periods at 1023 K (750 °C). A sharp reduction in impact energy (by ~55 pct vis-à-v...

    Aditya Narayan Singh, A. Moitra… in Metallurgical and Materials Transactions A (2017)

  11. No Access

    Article

    Microstructural Variations Across a Dissimilar 316L Austenitic: 9Cr Reduced Activation Ferritic Martensitic Steel Weld Joint

    This paper discuss the microstructural variations across a dissimilar weld joint between SS316 and 9Cr-RAFM steel and its modifications on post weld heat treatments (PWHT). Detailed characterization showed a m...

    V. Thomas Paul, T. Karthikeyan, Arup Dasgupta… in Metallurgical and Materials Transactions A (2016)

  12. No Access

    Article

    Development of p-type microcrystalline silicon carbon alloy films by the very high frequency plasma-enhanced chemical vapor deposition technique

    We developed p-type μc-silicon carbon alloy thin films by the very high frequency plasma-enhanced chemical vapour deposition technique using a SiH4, H2, CH4, and B2H6 gas mixture at low power (55 mW/cm2) and low ...

    Tapati Jana, Arup Dasgupta, Swati Ray in Journal of Materials Research (2001)

  13. No Access

    Article

    Measurement of Impurity Profiles in Microcrystalline Silicon Solar Cells by SIMS

    The concentration profiles of B, P, Zn, and O in the active intrinsic (i) μc-Si:H layer and across the interfaces in p-i-n and n-i-p structures have been measured with SIMS. For the ZnO/μc-p/μc-i sequences, an...

    Arup Dasgupta, Uwe Zastrow, Andreas Lambertz… in MRS Online Proceedings Library (2000)

  14. No Access

    Article

    Substrate temperature: A critical parameter for the growth of microcrystalline silicon-carbon alloy thin films at low power

    P-type microcrystalline silicon-carbon alloy thin films have been prepared at low power by employing radio-frequency plasma-enhanced chemical vapor deposition (rf-PECVD) technique; judicious choice of depositio.....

    Arup Dasgupta, S. C. Saha, Swati Ray, R. Carius in Journal of Materials Research (1999)