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Article

Conductometric and Thermodynamic Study of Copper and Nickel Sulfate in Aqueous Methanol Systems

1Department of Chemistry, University of Karachi, Karachi, Pakistan

2Department of Chemistry, Federal Urdu University of Arts, Science and Technology, Karachi, Pakistan


Journal of Materials Physics and Chemistry. 2013, 1(4), 69-75
DOI: 10.12691/jmpc-1-4-3
Copyright © 2013 Science and Education Publishing

Cite this paper:
Summyia Masood, Rehana Saeed, Sameera Razi Khan. Conductometric and Thermodynamic Study of Copper and Nickel Sulfate in Aqueous Methanol Systems. Journal of Materials Physics and Chemistry. 2013; 1(4):69-75. doi: 10.12691/jmpc-1-4-3.

Correspondence to: Summyia  Masood, Department of Chemistry, University of Karachi, Karachi, Pakistan. Email: smasood@uok.edu.pk

Abstract

Keywords

References

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[6]  Saeed, R, Masood, S. and Abdeen, Z, “Ionic Interaction of Transition Metal Salts with Polyvinyl Alcohol-Borax- Ethyl Acetate Mixtures”, Int. J. Sci Technol., 3(2), 132-142 (2013).
 
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Article

Microstructural Transformations of Dissimilar Austenite-Ferrite Stainless Steels Welded Joints

1Materials Engineering Department, University of Antioquia, Pyrometallurgical and Materials Research Group GIPIMME, Medellín, Colombia


Journal of Materials Physics and Chemistry. 2013, 1(4), 65-68
DOI: 10.12691/jmpc-1-4-2
Copyright © 2013 Science and Education Publishing

Cite this paper:
Sara Aguilar, Ramón Tabares, Claudia Serna. Microstructural Transformations of Dissimilar Austenite-Ferrite Stainless Steels Welded Joints. Journal of Materials Physics and Chemistry. 2013; 1(4):65-68. doi: 10.12691/jmpc-1-4-2.

Correspondence to: Sara  Aguilar, Materials Engineering Department, University of Antioquia, Pyrometallurgical and Materials Research Group GIPIMME, Medellín, Colombia. Email: saritamaria272@gmail.com

Abstract

This research studies the metallurgical transformations happening during the SMAW welding of AISI 316L austenitic stainless steel with AISI 430 ferritic stainless steel. Two different electrodes, AWS E309L austenitic and AWS E2209-16 duplex stainless steels 3.2 mm diameter, were used to perform the study. The joining was made with a single pass welding and keeping a low heat input ranging from 700 - 1000 J/mm. The influence of the type of electrode and the heat input on the microstructural evolution of the heat affected and the fusion zone was evaluated. Differences between δ ferrite morphology were found for both weld metals. The heat affected zone of the ferritic side showed grain coarsening and grain refinement with martensite at the grain boundaries. Tensile strength was similar for both welding conditions. Microhardness and δ ferrite percent were measured as well.

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References

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Article

Time-evolution of Heat Affected Zone (HAZ) of Friction Stir Welds of AA7075-T651

1Sabato Institute, UNSAM/CNEA, San Martín, Argentina

2Materials and Structures Laboratory, INTECIN, Faculty of Engineering, University of Buenos Aires, Buenos Aires, Argentina


Journal of Materials Physics and Chemistry. 2013, 1(4), 58-64
DOI: 10.12691/jmpc-1-4-1
Copyright © 2013 Science and Education Publishing

Cite this paper:
A. Pastor, H. G. Svoboda. Time-evolution of Heat Affected Zone (HAZ) of Friction Stir Welds of AA7075-T651. Journal of Materials Physics and Chemistry. 2013; 1(4):58-64. doi: 10.12691/jmpc-1-4-1.

Correspondence to: H.  G. Svoboda, Materials and Structures Laboratory, INTECIN, Faculty of Engineering, University of Buenos Aires, Buenos Aires, Argentina. Email: hsvobod@fi.uba.ar

Abstract

Friction Stir Welding (FSW) is a novel solid-phase welding process, which has proved to have a great potential for the realization of welded joints in materials with poor weldability such as heat-treatable aluminum alloys. However, the thermal cycles generated during FSW change the mechanical properties in heat affected zone (HAZ) due to two effects: over-age and re-dissolution of hardening precipitates. In other hand, the re-dissolved precipitates produce a evolution of both the microstructure and mechanical properties due to the natural aging phenomenon. The aim of this paper was to analyze the microstructural evolution in the HAZ of FSW joints in AA7075-T651 alloy. For this purpose samples FSW welded butt plate 4 mm in thickness. On the welded joint microstructural characterization was performed by light microscopy (LM), X-ray diffraction (XRD) and differential scanning calorimetry (DSC) and Vickers microhardness profiles (HV) after different elapsed times post welding. It was observed that the hardness increases with time after welding, due to the evolution of the phases present.

Keywords

References

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