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P RAMA RAO
Articles written in Bulletin of Materials Science
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Volume 11 Issue 4 December 1988 pp 329-336
M Srinivas G Malakondaiah P Rama Rao
The effect of solutes on resistance to fracture of body centred cubic iron single-phase solid-solution alloys has been investigated. The
J -integral method has been used for the measurement of ductile fracture toughness. TheJ IC values so determined quantitatively indicate the extent of degradation in fracture toughness due to the addition of hardening solute silicon. Cobalt addition results in alloy softening. The measuredJ IC values clearly demonstrate the toughening effect of cobalt addition as a solute, which result renders the case of Fe-Co solid-solution alloys interesting. -
Volume 12 Issue 1 March 1989 pp 1-1
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Volume 12 Issue 3-4 September 1989 pp 171-171 International Conference On Recent Advances In Materials And Processes
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Volume 13 Issue 1-2 March 1990 pp 1-2 First National Seminar On GaAs And III–V Compound Semiconductors
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Volume 14 Issue 2 April 1991 pp 93-94 International Conference On Superconductivity—I
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Volume 14 Issue 3 June 1991 pp 531-532 International Conference On Superconductivity—II
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Volume 15 Issue 1 February 1992 pp 1-1
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Volume 15 Issue 1 February 1992 pp 3-25
Material deformation and fracture under impulsive loading conditions
P Rama Rao S V Kamat G Sundararajan
Engineering structures experience impulsive loads during the time of natural disasters like earthquakes, cyclones and collisions. The design of structures resistant to such natural disasters requires an understanding of the deformation and fracture behaviour of the materials constituting the structure under impulsive loading conditions. In this paper the various aspects of dynamic plastic deformation and fracture of common engineering materials are reviewed and contrasted with their behaviour under static loading conditions.
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Volume 15 Issue 3 June 1992 pp 189-189
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Volume 15 Issue 5 August 1992 pp 389-389 Seminar On Ceramies And Glasses For Electronic Applications
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Volume 15 Issue 6 December 1992 pp 481-481 Symposium Session On Rapid Solidification Processing
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Volume 16 Issue 6 December 1993 pp 403-403
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Volume 17 Issue 5 October 1994 pp 1-
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Volume 17 Issue 6 November 1994 pp 1-
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Volume 17 Issue 6 November 1994 pp 633-641
Effect of alloying additions on
K ISCC of ultrahigh strength NiSiCr steelS V Kamat G Malakondaiah M Srinivas J Marthanda Murthy P Rama Rao
The effect of alloying additions viz. cobalt, molybdenum, cerium and a combination of cobalt and molybdenum, on the
K ISCC of NiSiCr steel in 3·5% NaCl aqueous solution was studied. Addition of cobalt to NiSiCr steel resulted in an increase in theK ISCC whereas molybdenum addition decreased theK ISCC. Cerium addition did not affect theK ISCC while the combination of cobalt and molybdenum resulted in an increase in theK ISCC although not as much as in the case of cobalt addition. The effect of alloying elements onK ISCC could be attributed to their effect on the critical fracture stress and yield strength. -
Volume 17 Issue 6 November 1994 pp 829-839
J Prabhjyot Pal S C Patil S B Ogale S M Kanetkar L Ganpathy P Rama Rao
Diamond like carbon films and C-N films were prepared using ion beam assisted deposition technique (IBAD). Tribological properties were studied by subjecting DLC coated films to the accelerated wear tests. These tests indicated a significant improvement in the mechanical surface properties of glass by DLC coating. Better wear features were obtained for thinner DLC coating as compared to the thicker ones. We also studied the optical properties and obtained a band gap of 1·4 eV for these films. An attempt was made to prepare C3N4 films by using IBAD. We observed variation in the nitrogen incorporation in the film with the substrate temperature.
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Volume 17 Issue 7 December 1994 pp 1197-1197
P Rama Rao K J Rao S L N Acharyulu Y R Mahajan S V Suryanarayana S Ranganathan
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Volume 18 Issue 4 August 1995 pp 325-341 Indo—Japan Seminar On New Materials
G Malakondaiah M Srinivas P Rama Rao
Ultrahigh strength steels have been used increasingly in recent years for critical aircraft and aerospace structural applications. In such applications, though materials performance is of prime consideration, cost and availability makes the low-alloy steels an attractive option. This paper describes the development of an ultrahigh strength NiSiCrCoMo low-alloy steel, supported by significant findings obtained from the basic studies that were aimed at understanding how solute additions influence fracture resistance of iron, with and without the presence of carbon. The results of the basic studies, in combination with the work of Garrison (1986) on a NiSiCr steel, have profitably been employed in the development of a NiSiCrCoMo low-alloy steel possessing a strength-toughness combination quite comparable to the highly alloyed 250-grade maraging steel. Reproducibility of attractive strength and toughness properties has been established in tonnage scale melts. This steel, in the softened condition, has good formability and machinability. Weld parameters have also been established. The NiSiCrCoMo low-alloy steel thus meets the requirements of performance and cost rendering it an attractive option for advanced structural applications.
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Volume 19 Issue 2 April 1996 pp 179-199
An integrated approach to the optimum utilization of national tungsten resources: Technology gaps
A critical review of the current status of tungsten resources, of state-of-the-art processing technology and of product development in India vis-a-vis the world scenario is presented. An attempt has been made to identify technology gap areas requiring attention.
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Volume 20 Issue 6 September 1997 pp 737-737 India-Japan Seminar On New Materials
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Volume 22 Issue 3 May 1999 pp 139-139
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Volume 22 Issue 5 August 1999 pp 827-827 India-Japan Seminar On Computational Materials Science, October 1998, Bangalore
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Volume 43 All articles Published: 3 January 2020 Article ID 0036
P RAMA RAO ANIL K BHATNAGAR BHASKAR MAJUMDAR
Synthesis and characterization of Ti$_{20}$Zr$_{20}Cu$_{60−x}$ Ni$_x$ ($x = 10$, 20, 30 and 40) metallic glasses are reported in this paper. Glassy ribbons are produced by rapid quenching using the standard copper wheel roller technique in argon atmosphere. Their structural characterization is carried out by X-ray diffraction (XRD) and thermal behaviour (crystallization) study by differential scanning calorimetry (DSC). Results of XRD on both sides of each ribbon sample confirmed that each sample was indeed amorphous/glassy as only a very broad peak in XRD pattern was observed. Metallic glass Ti$_{20}$Zr$_{20}$Cu$_{50}$Ni$_{10}$ shows three crystallization peaks in non-isothermal DSC scans while other three samples show only a single crystallization peak. The activation energy of crystallization for each sample has been calculated using three available models, namely, those of Kissinger, Augis–Bennett and Ozawa. All the three models gave nearly similar activation energies for a given sample within 10%.
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Bulletin of Materials Science
Volume 46, 2023
All articles
Continuous Article Publishing mode
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Bulletin of Materials Science | News
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Dr Shanti Swarup Bhatnagar for Science and Technology
Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020 -
Editorial Note on Continuous Article Publication
Posted on July 25, 2019Click here for Editorial Note on CAP Mode
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