Friction Stir Welding of Ceramic Particle Reinforced Aluminium Based Metal Matrix Composites

Cavaliere, Pasquale; Cerri, E.; Marzoli, L.; Santos, J. dos

doi:10.1023/b:acma.0000035478.71092.ec

Cited by 83 publications

(37 citation statements)

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“…A.H. Feng et al [102] and H. Uzun [103] confirmed similar results in FSW of Al-SiC MMCs. On the other hand, the breakage of A1 2 O 3 particles was also observed in several investigations [50,20,105]. However, X.G.…”

Section: Particle Redistributionmentioning

confidence: 55%

Joining of Al-B4C metal matrix composites by laser welding and friction stir welding /

Guo¹

2012

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AI-B4C MMCs are important materials as neutron absorber in spent nuclear fuel storage and transportation due to their high boron ( 10 B) concentration and thus high neutron absorption capability. However, wide application of these materials is still limited due to the lack of suitable joining techniques to fully take advantage of the materials. Problems such as porosity and chemical reaction between Al matrix and B4C particles can arise during fusion welding of the material. Therefore, the present study is intended to find effective and reliable welding techniques for AI-B4C MMCs. The weldability of AA1100-16%B 4 C (particle size: 11 pirn) and AA1100-30%B 4 C MMCs (median particle size: 15 pirn) was evaluated using laser welding and friction stir welding. In comparison with conventional arc welding techniques, the deep and narrow fusion zones associated with laser welding can result in smaller heat affected zones, and thus less thermal distortion and mechanical property degradation. On the other hand, friction stir welding, as a solid state process, seems promising as it can avoid various problems that may otherwise be encountered during fusion welding of MMCs.For laser welding without filler, it was found that most B4C particles were decomposed during welding leading to formation of needle-like AIB2 and AI3BC phases in the weld. In this case, a joint efficiency of 63% (UTS) after tensile test was obtained. The variation of laser power from 2 to 4 kW and welding speed from 1 to 2.5 m/min did not affect the needle-like morphology. Based on thermodynamic calculation, Ti filler was used as the filler material aiming to improve the properties of laser joints. It was found that the addition of Ti with 150 |nm thick foil increased the joint efficiency to 75% due to the decrease of size and quantities of needle-like phases. The addition of Ti with filler wire instead of Ti foil did not show significant mechanical property improvement due to the Ti segregation and microstructure inhomogeneity in the weld zone.On the other hand, the feasibility of friction stir welding for joining AA1100 based metal matrix composites reinforced with B 4 C particulate was studied for 16 and 30%B 4 C volume concentrations. For both composites, friction stir welding has a significant influence on the particle size distribution and the matrix grain size. For the AA1100-16%B4C composite, the average particle size decreases after welding by -20% and the grain size from 15 to 5 [xm as measured in the weld nugget. Tensile testing of welded joints showed up to 100% joint efficiency for both annealed AA1100-16%B 4 C and AA1100-30%B4C composite materials. However, if the ultimate tensile strength values of all the studied composites are similar at -130 MPa, the weld ductility is higher for the annealed materials. In addition, it was observed that varying the welding speed between 100 and 275 mm/min does not influence the joint tensile properties and the particle size distribution in the nugget. Furthermore, a welding tool made of WC-Co show...

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Section: Particle Redistributionmentioning

confidence: 55%

Joining of Al-B4C metal matrix composites by laser welding and friction stir welding /

Guo¹

2012

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“…The benefits therefore include the ability to join materials that are difficult to fusion weld, low distortions, excellent mechanical properties as proven by fatigue, tensile and bend tests, no loss of alloying elements, no arc, no fume, no porosity, no cracking, and no filler wire. [1][2][3][4][5] The plastic deformation and temperature profile during FSW produce a microstructure characterized by a central weld nugget surrounded by a thermomechanically affected zone (TMAZ) and heat-affected zone (HAZ) (Figure 1). …”

Section: Introductionmentioning

confidence: 99%

A Semianalytical Thermal Model for Fiction Stir Welding

Ferro

Bonollo

2009

Metall Mater Trans A

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The main difficulty in the formulation of any model for friction stir welding (FSW) is due to the high coupling between thermal and mechanical phenomena. In the analytical models present in the literature, the fundamental unknown parameter, under the assumption of sticking between the tool/matrix interface, is the yield shear stress, which is temperature dependent. For this reason, any fully analytical model is unable to predict the temperatures for conditions not supported by measurements of the heat input. In this work a semianalytical thermal model for FSW is proposed. The formulation of heat flow during the welding process is based on generic solutions of the differential equation for heat conduction in a solid body, formulated for a point heat source with constant linear velocity. The heat generation was considered as a function of the tool-matrix interface temperature, which is calculated by means of a numerical routine written in Matlab code. Comparison with the experimental measurements taken from the literature shows that the results from the present semianalytical model are in good agreement with the test data

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“…3. Softened material flow and dislocation density differences during the welding process are the main reason to form onion shaped structure in the NZ [21,22]. …”

Section: Macrostructure Evaluation Of Friction Stir Weld Zonementioning

confidence: 99%

Friction stir welding of Aluminium matrix composites – A Review

et al. 2018

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Friction stir welding (FSW) is established as one of the prominent welding techniques to join aluminium matrix composites (AMCs). It is a solid state welding process, takes place well below the melting temperature of the material, eliminates the detrimental effects of conventional fusion welding process. Although the process is capable to join AMCs, challenges are still open that need to be fulfill to widen its applications. This paper gives the outline of the friction stir welding technique used to join AMCs. Effect of process variables on the microstructure and mechanical properties of the joints, behavior of reinforcing materials during welding, effect of tool profiles on the joint strength are discussed in detail. Few improvements and direction for future research are also proposed.

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Friction Stir Welding of Ceramic Particle Reinforced Aluminium Based Metal Matrix Composites

Cited by 83 publications

References 0 publications

Joining of Al-B4C metal matrix composites by laser welding and friction stir welding /

Joining of Al-B4C metal matrix composites by laser welding and friction stir welding /

A Semianalytical Thermal Model for Fiction Stir Welding

Friction stir welding of Aluminium matrix composites – A Review

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