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JournalISSN: 0393-6074

Metallurgical Science and Tecnology 

About: Metallurgical Science and Tecnology is an academic journal. The journal publishes majorly in the area(s): Aluminium & Microstructure. It has an ISSN identifier of 0393-6074. Over the lifetime, 152 publications have been published receiving 954 citations.

Papers published on a yearly basis

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Journal Article
TL;DR: In this article, a robust sensor suitable for determining heat flow and heat transfer coefficient in high pressure die casting is presented, together with a design methodology for the sensor and the conclusions of this analysis.
Abstract: This paper presents a design for a robust sensor suitable for determining heat flow and heat transfer coefficient in high pressure die casting. A design methodology for the sensor is presented, together with the conclusions of this analysis. A sensor has been manufactured to these principles and some typical results from its operation are introduced.

67 citations

Journal Article
TL;DR: In this paper, four mm thick AA2198 Al-Li alloys were joined via friction stir welding (FSW) by employing a rotating speed of 1000 RPM and a welding speed of 80 mm/min in parallel and orthogonal direction with respect to the rolling direction.
Abstract: Al-Li alloys are characterized by a strong anisotropy in mechanical and microstructural properties with respect to the rolling direction. In the present paper sheets, 4 mm thick, of AA2198 Al-Li alloy were joined via Friction Stir Welding (FSW) by employing a rotating speed of 1000 RPM and a welding speed of 80 mm/min, in parallel and orthogonal direction with respect to the rolling one. The joint mechanical properties were evaluated by means of tensile tests at room temperature. In addition, fatigue tests were performed by using a resonant electro-mechanical testing machine under constant amplitude control up to 250 Hz sinusoidal loading. The fatigue tests were conducted in axial control mode with R=?min/?max=0.33, for all the welding and rotating speeds conditions. The damage behavior was studied by applying thermoelastic stress analysis (TSA) to the crack formation and propagation of friction stir welded sheets under cyclic fatigue tests. The fatigue crack propagation experiments were performed on single edge notched specimens. Fatigue tests were carried out up to failure in tension- tension with load ratio R=0.33. The TSA measurement system allowed crack evolution to be observed in real-time during fatigue cycles and stress fields to be derived on the specimens from the temperature variation. The thermoelastic data were used to measure the principal stresses and principal strains on the specimens surface and the crack growth rate during tests. All the results were validated by employing finite element analysis performed with ABAQUS software. SEM observations of the fractured surfaces were done to characterize the weld performances.

46 citations

Journal Article
TL;DR: In this paper, the microstructure and tensile properties of aluminium die-cast alloys, based on A380, are studied in details as a function of the iron and manganese content and solidification rate.
Abstract: In the present investigation, the microstructure and tensile properties of aluminium die-cast alloys, based on A380, are studied in details as a function of the iron and manganese content and solidification rate. One set of experiments was designed to examine the ?solely? effect of Fe content, which varied from 0.1 up to 1.6 wt % and another set with manganese additions, Mn:Fe ~ 1:2. Three solidification rates corresponding to ~ 10, 25 and 60 ?m in secondary dendrite arm spacing, SDAS, respectively were employed by using the unique gradient solidification technique. Microstructure analysis reveals that at relatively high cooling rates and iron levels, the iron-rich precipitates are suppressed to some extent and the strength is maintained at high levels, but the ductility is gradually decreased. The amount of iron-rich intermetallics does not appear to influence the size and area fraction of porosity and consequently the result suggests that tensile properties have not been adversely affected by porosity level. These results offer additional insight into commonly discussed microstructure features and their role in the determination of the quality and soundness of Al-Si cast alloys.

42 citations

Journal Article
TL;DR: In this article, ultrasonic cavitation effect was proposed to disperse SiC nanoparticles in aluminum alloy A356 melts before casting, and the results showed that with only 1.0wt.% nano-sized SiC reinforcement (about 30nm), the ultimate tensile strength and yield strength of A356 were enhanced significantly while the ductility was retained.
Abstract: Aluminum alloy A356 is of significance for numerous applications. The mechanical properties of A356 would be enhanced considerably if reinforced by thermodynamically- stable nanoparticles. However, it is very challenging to disperse nanoparticles uniformly in A356 melts for casting A356 nanocomposites. In this study, ultrasonic cavitation effect was proposed to disperse SiC nanoparticles in A356 melts before casting. The novel method was theoretically studied and then experimented. With only 1.0wt.% nano-sized SiC reinforcement (about 30nm), the ultimate tensile strength and yield strength of the aluminum alloy A356 were enhanced significantly while the ductility was retained. The study on micro/nano structures of the nanocomposites validates that a uniform distribution and effective dispersion of nanoparticles in A356 matrix were achieved. Moreover, a good bonding between the SiC nanoparticles and the Al matrix was obtained. This study paves a way for high volume solidification processing of metal matrix nanocomposites for industrial applications.

41 citations

Journal Article
TL;DR: In this article, the microstructure and mechanical characteristics of joints welded with Gas Metal Arc Welding (GMAW) procedure, made of plates of 6082-T6 alloy, are investigated.
Abstract: In the utilisation of aluminium alloys for structural applications, one difficulty to be overcome is the reduction of mechanical properties of welded joints as compared to the parent material, consequent upon the weaker strength of the Weld Metal (WM) and the deterioration in the Heat Affected Zone (HAZ) due to welding thermal cycles. In this paper the microstructure and mechanical characteristics of joints welded with Gas Metal Arc Welding (GMAW) procedure, made of plates of 6082-T6 alloy, are investigated. Experimental work included Vickers microhardness test, tensile test, fatigue rotating bending test, Charpy V impact test and Scanning Electron Microscopy (SEM) fractography. Diagrams of fatigue stress - cycles for parent and welded material were compared. Static tensile tests showed minimum strength in the HAZ, while fatigue strength and fracture toughness have minimum value in the WM. Fracture toughness in terms of KIC, estimated by empirical relations, showed the lowest value in the melted zone.

41 citations

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Performance
Metrics
No. of papers from the Journal in previous years
YearPapers
2013150
20021
19921