Fabrication of TiB2 particulate reinforced magnesium matrix composites by powder metallurgy

Wang, H.Y.; Jiang, Qi–Chuan; Wang, Y.; Ma, Bing; Zhao, Fang

doi:10.1016/j.matlet.2004.04.038

Cited by 130 publications

(52 citation statements)

References 21 publications

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“…The property of the AMCs depends on the property of the matrix and the reinforcement. Different types of reinforcement materials, ranging from typical ceramics, such as Al 2 O 3, AlN and SiC [7][8][9], to more unconventional reinforcements, such as quasicrystals [10,11] and complex metallic alloys (CMAs) [12], have been successfully used as reinforcements in MMCs. Other possible candidates as reinforcing agents in MMCs are amorphous, partially amorphous and nanocrystalline Al-based alloys, which have attracted widespread attention as potential candidates for structural as well as functional applications due to their high strength combined with low density [13,14].…”

Section: Introductionmentioning

confidence: 99%

Effect of Particle Size on Microstructure and Mechanical Properties of Al-Based Composite Reinforced with 10 Vol.% Mechanically Alloyed Mg-7.4%Al Particles

et al. 2016

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Abstract:The effect of Mg-7.4%Al reinforcement particle size on the microstructure and mechanical properties in pure Al matrix composites was investigated. The samples were prepared by hot consolidation using 10 vol.% reinforcement in different size ranges, D, 0 < D < 20 µm (0-20 µm), 20 ≤ D < 40 µm (20-40 µm), 40 ≤ D < 80 µm (40-80 µm) and 80 ≤ D < 100 µm (80-100 µm). The result reveals that particle size has a strong influence on the yield strength, ultimate tensile strength and percentage elongation. As the particle size decreases from 80 ≤ D < 100 µm to 0 < D < 20 µm, both tensile strength and ductility increases from 195 MPa to 295 MPa and 3% to 4% respectively, due to the reduced ligament size and particle fracturing. Wear test results also corroborate the size effect, where accelerated wear is observed in the composite samples reinforced with coarse particles.

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Section: Introductionmentioning

confidence: 99%

Effect of Particle Size on Microstructure and Mechanical Properties of Al-Based Composite Reinforced with 10 Vol.% Mechanically Alloyed Mg-7.4%Al Particles

et al. 2016

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“…The variation of mechanical properties with increasing Mg 2 Si content in both cast and forged composites is shown in Figure 5, which also includes the corresponding properties of cast and forged MA alloy as a composite with zero Mg 2 Si content. As the volume fraction of Mg 2 Si increases, there is a significant improvement in the hardness of both the cast and forged composites, as shown in Figure 5(a), which are higher than those observed by Wang et al [5,6] The presence of about 2.9 vol pct Mg 2 Si improves the hardness in cast MA1S by a factor of about 1.2 over that observed in cast MA alloy. Forging increases the hardness of cast MA alloy.…”

Section: Resultsmentioning

confidence: 64%

“…Wang et al [5] observed 41, 106, and 181 pct increases in hardness over that of cast magnesium by reinforcing magnesium with 10, 20, and 30 vol pct TiB 2 particles, respectively, by powder metallurgy. In cast AZ91 alloy reinforced with 2, 5, and 7.5 wt pct fine TiB 2 (~7 lm) particles, Wang et al [6] observed that hardness increases with increasing TiB 2 content.…”

Section: Introductionmentioning

confidence: 99%

Tensile and Fracture Properties of Cast and Forged Composite Synthesized by Addition of Al-Si Alloy to Magnesium

Swamy

Nath

Ray

2009

Metall Mater Trans A

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Cast Mg-Al-Si composites synthesized by addition of Al-Si alloy containing 10, 15, and 20 wt pct of Si, in molten magnesium, to generate particles of Mg 2 Si by reaction between silicon and magnesium during stir casting has opened up the possibility to control the size of these particles. The microstructure of the cast composite consists of relatively dark polyhedral phase of Mg 2 Si and bright phase of b-Al 12 Mg 17 along the boundary between dendrites of a-Mg solid solution. After hot forging at 350°C, the microstructure has changed to relatively smaller sizes of b-Al 12 Mg 17 and Mg 2 Si particles apart from larger grains surrounded by smaller grains due to dynamic recovery and recrystallization. Some of the Mg 2 Si particles crack during forging. In both the cast and forged composite, the Brinell hardness increases rapidly with increasing volume fraction of Mg 2 Si, but the hardness is higher in forged composites by about 100 BHN. Yield strength in cast composites improves over that of the cast alloy, but there is a marginal increase in yield strength with increasing Mg 2 Si content. In forged composites, there is significant improvement in yield strength with increasing Mg 2 Si particles and also over those observed in their cast counterpart. In cast composites, ultimate tensile strength (UTS) decreases with increasing Mg 2 Si content possibly due to increased casting defects such as porosity and segregation, which increases with increasing Mg 2 Si content and may counteract the strengthening effect of Mg 2 Si content. However, in forged composite, UTS increases with increasing Mg 2 Si content until 5.25 vol pct due to elimination of segregation and lowering of porosity, but at higher Mg 2 Si content of 7 vol pct, UTS decreases, possibly due to extensive cracking of Mg 2 Si particles. On forging, the ductility decreases in forged alloy and composites possibly due to the remaining strain and the forged microstructure. The initiation fracture toughness, J IC , decreases drastically in cast composites from that of Mg-9 wt pct. alloy designated as MA alloy due to the presence Mg 2 Si particles. Thereafter, J IC does not appear to be very sensitive to the increasing presence of Mg 2 Si particles. There is drastic reduction of J IC on forging of the alloy, which was attributed to the remaining strain and forged microstructure, and it is further lowered in the composites because of cracking of Mg 2 Si particles. The ratio of the tearing modulus to the elastic modulus in cast composites shows a lower ratio, which decreases with increasing Mg 2 Si content. The ratio decreases comparatively more on forging of cast MA alloy than those observed in forged composites.

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“…The details of density measurement were given elsewhere. 22) Metallographic samples were prepared in accordance with standard procedures used for metallographic preparation of metal samples, and etched with about 5 vol% HNO 3 alcoholic solution for 10-12 s at room temperature. The microstructure analysis of the samples was investigated by using scanning electron microscopy (SEM) (QUANTA200, America) and field emission scanning electron microscopy (FESEM) (XL30, America) equipped with energy-dispersive spectrometer (EDS) (EDAX, America).…”

Section: Methodsmentioning

confidence: 99%

In Situ Synthesis of Ti5Si3 Intermetallic Particulate Locally Reinforced Medium Carbon Steel-matrix Composite via the SHS Reaction of Fe–Ti–Si System during Casting

Wang

Guan

et al. 2007

ISIJ Int.

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The in situ Ti 5 Si 3 intermetallic particulate locally reinforced steel matrix composites are successfully fabricated by the self-propagating high-temperature synthesis (SHS) reaction of Fe-Ti-Si system during casting, and the microstructures of the composites reveal a relatively uniform distribution of mango-like Ti 5 Si 3 particulates in the local reinforcing regions. XRD results reveal that in addition to a-Fe and Ti 5 Si 3 phases, the transient Fe 2 Ti is also present in the local reinforcing region of the composites. Furthermore, some Ti 3 SiC 2 particulates are formed and distribute in the limited region nearby the interface between the local reinforcing region and steel matrix. With Fe content increasing from 10 to 30 wt% in the preforms, the Ti 5 Si 3 particulate size is decreased obviously in the local reinforcing region; furthermore, the presence of significant porosity can be detected in the composite synthesized by the 10 wt% Fe-Ti-Si system; on the contrary, only a minimal porosity can be found in that synthesized by 30 wt% Fe in Fe-Ti-Si system. The macro-and micro-hardness as well as the wear resistance of the local reinforcing region are obviously higher than those of the unreinforced medium steel. Improvements in hardness and wear resistance of the composite are mainly attributed to the presence of high volume fraction of hard intermetallic Ti 5 Si 3 particulates.KEY WORDS: in situ; intermetallic; locally reinforced; steel matrix composite; SHS. Experimental ProcedureIn this study, the starting materials were made of commercial powders of 10, 20, 30, 40 and 50 wt% Fe (99.0% purity, ϳ10 mm), Ti (99.5 % purity, ϳ38 mm), and Si (99.5 % purity, ϳ15 mm), respectively. Titanium and silicon powders were used in a ratio corresponding to that of stoichiometric Ti 5 Si 3 . Powder blends with different starting compositions were dry-mixed sufficiently by a ball milling for 6 h in a cylindrical stainless steel jar containing GCr15 bearing steel balls with a ball to powder weight ratio of about 5 : 1 by mechanical rotation at 40 rpm, and then were cold-isostatically pressed into cylindrical preforms (about 20 mm diameter and 10 mm length) by using a stainless steel die with two plungers. The green preforms were pressed uniaxially at pressure ranging from 88-92 MPa to obtain relative densities of 63Ϯ2% theoretical density. Then the preforms were placed and fixed on the side of the sand mold, respectively, as schematically illustrated in Fig. 2 in Ref. 11). Subsequently, the medium carbon steel melt, which composition is measured by an ARL4460 Metals Analyzer and shown in Table 1, prepared by non-oxidation process in a 5 kg medium-frequency induction furnace with a temperature of about 1 600°C was poured into the mold to ignite the SHS reaction of the preforms. After solidification and cooling, composite castings were removed and sectioned in the side position.Vickers microhardness values of the matrix and local reinforcing region in the samples were tested under a load of 50 g with an indentarion time of 10...

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Fabrication of TiB2 particulate reinforced magnesium matrix composites by powder metallurgy

Cited by 130 publications

References 21 publications

Effect of Particle Size on Microstructure and Mechanical Properties of Al-Based Composite Reinforced with 10 Vol.% Mechanically Alloyed Mg-7.4%Al Particles

Effect of Particle Size on Microstructure and Mechanical Properties of Al-Based Composite Reinforced with 10 Vol.% Mechanically Alloyed Mg-7.4%Al Particles

Tensile and Fracture Properties of Cast and Forged Composite Synthesized by Addition of Al-Si Alloy to Magnesium

In Situ Synthesis of Ti5Si3 Intermetallic Particulate Locally Reinforced Medium Carbon Steel-matrix Composite via the SHS Reaction of Fe–Ti–Si System during Casting

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