Optimization of Mechanical and Wear Properties of Functionally Graded Al6061/SiC Nanocomposites Produced by Friction Stir Processing (FSP)

doi:10.1007/s40195-015-0235-7

Abstract

Abstract:

The objective of present work is to apply the friction stir processing (FSP) to fabricate functionally graded SiC particulate reinforced Al6061 composite and investigate the effect of SiC particle mass fraction distribution on the mechanical properties and wear behavior of Al6061/SiC composite. Regarding the obtained results in this work, with increasing SiC mass fraction, elongation decreased, but hardness enhanced. However, the optimized functionally graded composite with the highest tensile strength and wear resistance was achieved for composite with 10 wt% surface SiC. Also, the results showed that wear resistance and tensile strength decreased for composite with 13 wt% surface SiC, due to reinforcement particle clustering depending on high SiC mass fraction.

Key words: Functionally graded composite, Wear, Mechanical properties, Friction stir processing (FSP)

M. Saadatmand, J. Aghazadeh Mohandesi. Optimization of Mechanical and Wear Properties of Functionally Graded Al6061/SiC Nanocomposites Produced by Friction Stir Processing (FSP)[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(5): 584-590.

Figures/Tables 13

Fig. 1 a Dimension (unit: mm) of the used pin for FSP; b appearance of FSPed Al6061 with SiC particles

Fig. 2 a Photograph of the composite zone for F10 composite; b Illustration of the position of tensile specimen

Fig. 3 Schematic illustration of wear test

Fig. 4 Fraction of SiC as a function of distance from surface of FG composites

Fig. 5 Microhardness as a function of distance from surface of FG composites

Fig. 6 Optical macroscopic appearances of cross section of F2 a, F5 b, F8 c, F10 d, F13 e samples

Fig. 7 Back-scattered SEM images of F2 a, F5 b, F8 c, F10 d, F13 e samples, arrows A in Fig. 7e showing clustering for F13

Fig. 8 Stress-strain curves of F2, F5, F8, F10, and F13 samples

Table 1 Mechanical properties and weight loss of F2, F5, F8, F10, and F13 samples

Composite	0.2% yield strength (MPa)	Ultimate strength (MPa)	Weight loss (g)
F₂	102	185.3	0.0092 ± 0.0002
F₅	117	205.3	0.0060 ± 0.0002
F₈	144	234.5	0.0041 ± 0.0002
F₁₀	176	248	0.0025 ± 0.0002
F₁₃	152	198.3	0.0032 ± 0.0002

Fig. 9 SEM micrograph of worn surfaces of F2 a, F5 b samples

Fig. 10 SEM image of worn surface of F8 sample

Fig. 11 SEM image of worn surface of F10 sample

Fig. 12 SEM image of worn surface of F13 sample

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