Mechanical Properties and Corrosion Behavior of WZ73 Mg Alloy/SiCp Composite Fabricated by Stir Casting Method

Abstract

Low strength, which limits the industrial applications of Mg alloys, can be improved by forming Mg-based metal matrix composites (MMC) reinforced with ceramic particles. In this study, a Mg-based MMC was synthesized by introducing SiC particles into a WZ73 Mg alloy using the stir casting method. The effects of the SiC particles on the mechanical properties and corrosion behavior of WZ73 alloys were studied. The results showed that an addition of 1.5 vol % of SiC enhanced the strength of a WZ73 alloy but reduced the corrosion resistance. A further increase of SiC to 2.5 vol % had no effects on strength and corrosion behavior, which was attributed to the agglomeration of SiC particles. A microstructural analysis indicated that the addition of SiC did not alter the morphology and distribution of the secondary phase in the WZ73 alloy. Thus, the improved strength was attributed to the reinforcement of SiC and the refinement of the Mg grain, while the degraded corrosion resistance was the result of the grain refinement of Mg and the presence of the Mg/SiC interface in the vicinity of the secondary phase, which breaks the continuity of the Mg matrix and results in a higher corrosion rate.

Characterization of AZ31-NbC surface composite fabricated by friction stir processing

“…The corrosion rate drastically increased for the developed surface composite AZ31-NbC after 24 hours of corrosion. This attributes to the presence of Mg matrix/NbC that breaks the continuity of the Mg matrix and creating preferential regions for corrosion, which is similar to the observation of Chan Chiu et al [20]. This increases the corrosion rate of the developed surface composite than that of the base material.…”

“…Mishra et al, reviewed the fabrication of surface composites by FSP [13][14][15]. The common reinforcements that are used to fabricate composites by FSP include CNT [16], MWCNT [17,18], SiC [19,20], SiO 2 [21,22], ZrO 2 [21], HAP [23], Al 2 O 3 [24,25], fly ash [26], TiC [27,28] and WC [13,29].…”

Dry Sliding Wear and Corrosion Performance of Mg-Sn-Ti Alloys Produced by Casting and Extrusion

“…Investigating the impact of reinforcement particles and second phases on the corrosion properties of Mg alloys reveals that second phases and particles can deteriorate the corrosion resistance of Mg alloys. It has also been reported that increasing the volume fraction of the second phase can decrease the corrosion resistance [ 42 , 43 , 44 ]. The presence of Ti particles, together with SnTi 3 and Mg 2 Sn phases, which have different electrochemical potential values, can act as a cathode and lead to the formation of microgalvanic cells, which are responsible for pitting corrosion in Mg-5Sn samples containing Ti as a microalloying element.…”

Study of an Mg90Y7Zn3 alloy (WZ73) in sodium chloride solution — An analysis by correlated polarization and climate chamber testing

“…During the climate chamber test, a whitish‐gray layer of voluminous Mg(OH) 2 assimilated rapidly on the sample surface 20,24,25 . Figure 5 compares the corrosion product evolution in the chosen test solutions of concentration c 1 and c 2 as observed after 24 h of exposure.…”