Microstructure and mechanical properties of SiC particles reinforced Mg–8Al–1Sn magnesium matrix composites fabricated by powder metallurgy

Abstract

The new type of Mg-8Al-1Sn (AT81) magnesium matrix composites reinforced with different volume fractions (5, 10, 15, 20, 25 and 30 vol.-%) of SiC particles (average size of 10 mm) was fabricated by powder metallurgy. With the increasing volume fraction of SiC particles (SiC p ), the particles gradually show more homogeneous distribution. Compared with the AT81 alloy, the yield strength (YS) and ultimate compressive strength of the SiC p /AT81 composites are improved simultaneously. With the increasing SiC p from 0 to 30 vol.-%, the YS and ultimate compressive strength increase from 69 to 239 MPa and 286 to 385 MPa respectively, while the corresponding fracture strain (e) decreases from 19?3 to 4?8%. The improvement of the YS and ultimate compressive strength of the SiC p /AT81 composites benefits from the more homogeneous microstructure due to the increase in the SiC particles.

Enhancing the Hardness and Compressive Response of Magnesium Using Complex Composition Alloy Reinforcement

“…The resultant lower failure strain in the Mg-5CCA composite can be accounted for with the influence of small grains from the grain distribution measurement (Figure 4c) and microstructural observation (Figure 5c). [17] 89 ± 3 368 ± 8 15.1 ± 1.5 Mg-5 vol % Ni 60 Nb 40 [18] 130 ± 11 320 ± 11 18.4 ± 1.3 AT81-5 vol % SiC [9] 127 ± 10 301 ± 20 11.4 ± 0.5 AZ91D-3 vol % TiC [10] -320 failure strain to Mg and its composites (Table 2). However, the average failure strain in Mg-5CCA was found to be lower than that in Mg-2.5CCA and Mg-7.5CCA.…”

“…The resultant lower failure strain in the Mg-5CCA composite can be accounted for with the influence of small grains from the grain distribution measurement (Figure 4c) and microstructural observation (Figure 5c). [17] 89 ± 3 368 ± 8 15.1 ± 1.5 Mg-5 vol % Ni60Nb40 [18] 130 ± 11 320 ± 11 18.4 ± 1.3 AT81-5 vol % SiC [9] 127 ± 10 301 ± 20 11.4 ± 0.5 AZ91D-3 vol % TiC [10] -320 * 17 * * Values approximated from the Compression graph. When compared to Mg composites containing ball-milled amorphous particles with a comparable amount of reinforcement addition, a significant improvement in compressive yield strength and ultimate compressive strength was observed in the Mg composite containing CCA particles while maintaining a similar compressive failure strain level (Table 2).…”

“…The attractive physical and mechanical properties obtained from metal matrix composites (MMCs) have made them potential candidates for aerospace, automotive, and other structural applications [6]. For the fabrication of magnesium composites, various types of ceramic reinforcements, such as alumina (Al 2 O 3 ), yttria (Y 2 O 3 ), zirconia (ZrO 2 ), silicon carbide (SiC), boron carbide (B 4 C), and titanium carbide (TiC), have been used in Mg matrix [7][8][9][10][11]. In addition to ceramic reinforcements, research efforts have been made to synthesize Mg composites using metal particle reinforcements, such as copper, nickel, titanium, molybdenum, and aluminum [11,12].…”

Microstructure, mechanical and wear characteristics of CeO2-Mg metal matrix composites

“…Guleryuz et al 25 26 reported that the addition of 'SiC and Mg' increases the microhardness, CoF, density, wear resistance, less porosity, good bond formation and also enhances the embrittling effect to hybrid MMCs. Luo et al 27 evaluated the effects of volume percentage of SiC on Mg-8Al-1Sn through powder metallurgy. The compression strength of the samples has increased with the increase in volume of the reinforcement.…”

Powder metallurgy and hardness of the Ll-10Mg alloy reinforced with carbon nanotubes

“…The metal matrix's reinforcing materials can be ceramic particles or fibers that offer high mechanical strength and high modulus of elasticity, properties that make them optimal materials in various technological applications [9]. The most commonly reinforcement materials are, SiO 2 [10], Al 2 O 3 [11], Y 2 O 3 [12], ZrO 2 [13], TiC [14], B 4 C [15], SiC [16], Si 3 N 4 [17], graphene [18], fullerenes [19], and carbon nanotubes (CNTs) [20].…”