The structure and properties of magnesium-matrix composites

Abstract

Magnesium and magnesium-alloy composites reinforced with SiC particles have been fabricated by a powder metallurgy route involving low-energy mechanical alloying as well as dry mixing, and by the ingot metallurgy route based on a fluxless melting technology. Tensile and instrumented impact tests supplemented by optical and scanning-electron fractography and oblique-section metallography have been used to assess the role of particle/matrix interface reinforcement and the matrix on the crack initiation and propagation behavior. Of the routes employed, low-energy mechanical alloying provided the best property combination.

Characteristics of Mg-based composites synthesized using a novel mechanical disintegration and deposition technique

“…The orientation factor cos 2 ␣ d is equivalent to 0.31 elsewhere (Table IV). [38] The 3 pct ductility of Mg/26.3 wt for materials with a random orientation of pores, which pct (16.3 vol pct) SiC is superior to that of the liquid-cast correspond to a ␣ d of 56 deg. [32] Assuming that z/x is one, the Mg/10 vol pct SiC (2 pct ductility) composite (Table IV).…”

“…[32] Assuming that z/x is one, the Mg/10 vol pct SiC (2 pct ductility) composite (Table IV). [38] elastic modulus of the composites is calculated and shown in Table VI. The results obtained clearly exhibited an upward E. Fracture Behavior correction, indicating the achievable elastic modulus from the materials synthesized in the present study.…”

“…This can be attributed Regarding the grain morphology, a completely recrystallized and equiaxed grain structure was observed in the case to (1) the ability of Mg to wet SiC, [7,8] (2) the mechanical disintegration employed in MDD, and (3) the redistribution of Mg and Mg/SiC samples (Figure 2). The temperature used for hot extrusion was above the recrystallization temof SiC particulates during hot extrusion as a result of different deformation modes in operation across the cross section of perature of Mg. Recrystallization took place with grain [38] 45 120 160 2 -the extrusion billet. [21,22] Besides redistributing SiC particuwork in this area is continuing.…”

Rotation-cylinder method for fabrication of SiC particle reinforced magnesium composites

“…Low density is important for uses in the transport industry and in electronics applications where low inertia is required for rapidly moving parts. SiC particles reinforced magnesium composites are of commercial interests in these fields [1][2][3], and they have added advantages if they can be manufactured using a molten metal mixing method and hence minimize the capital costs associated with manufacturing [4][5][6].…”

First-principles study on the stability and electronic structure of Mg/ZrB2 interfaces

“…ZrB 2 nanoparticle are such effective nucleants and they are capable of inducing finer long-period stacking ordered phase (nano-LPSO-layer) formation due to the nano-surface effect and finally resulting in the formation of nanograins in magnesium alloys [5]. Also, it is a suitable way to improve the magnesium alloys' stiffness, elastic modulus and wear resistances by preparing particle reinforced magnesium matrix composites since ceramic particles have high strength, hardness and high-wearing features [6,7]. Compared with SiC and TiC particles, ZrB 2 particle reinforced magnesium-based composites fabricated by a direct melt-mixing method [8] have the best strength [9].…”