Investigation of the mechanical behaviour of magnesium composites

Purazrang, K.; Abachi, P.; Kainer, Karl Ulrich

doi:10.1016/0010-4361(94)90222-4

Cited by 39 publications

(19 citation statements)

References 7 publications

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“…The variation of tensile strength with Al 2 O 3 particle content and size. has increased the tensile strength and hardness of the Al alloy [27,33].…”

Section: Hardness and Tensile Strengthmentioning

confidence: 99%

Production and mechanical properties of Al2O3 particle-reinforced 2024 aluminium alloy composites

Kök

2005

Journal of Materials Processing Technology

670

229

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“…The variation of tensile strength with Al 2 O 3 particle content and size. has increased the tensile strength and hardness of the Al alloy [27,33].…”

Section: Hardness and Tensile Strengthmentioning

confidence: 99%

Production and mechanical properties of Al2O3 particle-reinforced 2024 aluminium alloy composites

Kök

2005

Journal of Materials Processing Technology

670

229

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“…The J IC decreases drastically from cast MA alloy to cast composites due to the presence Mg 2 Si particles, as shown in Figure 8. Purazrang et al [15] observed a similar decrease of K IC when AZ91 alloy was reinforced by short alumina fibers. There is drastic reduction of J IC on forging of MA alloy, and it could be attributed to lowering of ductility on forging.…”

Section: Elementmentioning

confidence: 74%

“…The T6 heat treatment decreases it further. Purazrang et al [15] in a later study has observed that K IC decreases with increasing alumina content. Manoharan and Lewandowski [16] observed in Al-Zn-Mg-Cu alloy based composites that, in underaged composite, J IC decreases linearly with increasing volume fraction of SiC, while in overaged composite, a more rapid decrease in J IC is observed.…”

Section: Introductionmentioning

confidence: 95%

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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“…[1][2][3][4][5][6] However, there are few studies regarding the fabrication of particle reinforced pure magnesium using powder metallurgy (PM) methods, and in particular, mechanical alloying (MA) method. Magnesium is generally softer than its alloys, and therefore a simple reinforcement with ceramic particles should be addressed for wide application of magnesium alloys.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Alumina-Dispersed Magnesium Fabricated Using Mechanical Alloying Method

Kawamori

Machida

2007

Mater. Trans.

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In order to improve the mechanical properties of magnesium, dispersion strengthening with -alumina particles (pAl 2 O 3 ) is experimentally investigated as an application of powder metallurgy. The trial process consists of milling, compacting and hot-pressing. The microstructure of hot-pressed discs of magnesium composites were investigated using optical microscopy, scanning electron microscopy, x-ray diffraction (XRD) and electron probe micro analysis, and the density, surface hardness, and bending stress for deflection were also examined. All of the mechanically alloyed (MA) prepared powders were composed of only magnesium (Mg) and alumina (Al 2 O 3 ). Although the particle size of the MA powders varied, the mean values were approximately 80 mm and were approximately the half size of the raw Mg powder. Not only Mg powder, but also pAl 2 O 3 became finer with processing, and the pAl 2 O 3 was almost uniformly dispersed in the Mg powder. In addition, the fine pAl 2 O 3 was almost uniformly dispersed within the Mg of the pAl 2 O 3 dispersion strengthened (ODS) magnesium discs. For all discs, a small quantity of magnesium oxide (MgO) was identified along with Mg and Al 2 O 3 . However, in only the 22.7 vol% pAl 2 O 3 /Mg disc, an XRD peak assigned to an Al-Mg intermetallic compound (Al 12 Mg 17 ) was detected, in addition to Mg, Al 2 O 3 and MgO. It is proposed that Al 12 Mg 17 was produced by the solid-state reaction of Mg and Al 2 O 3 , and appeared at the interface between the regions of only Mg and regions where pAl 2 O 3 is dispersed in Mg. The density of the discs was above the theoretical density for all pAl 2 O 3 content; the density for the highest pAl 2 O 3 content of 22.7 vol% was approximately 0.8 times greater than that of practical Al alloys. The 22.7 vol% pAl 2 O 3 disc had a maximum hardness value of 280 HV. This value is much higher than that of both pure Mg ingot and AZ91D. The bending stress for deflection decreased with an increase in the pAl 2 O 3 content. The reason for this is considered to be that the discs become harder and more brittle, and voids are more easily formed in the discs; therefore, cracks that are generated on the specimen surface propagate more easily.

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Investigation of the mechanical behaviour of magnesium composites

Cited by 39 publications

References 7 publications

Production and mechanical properties of Al2O3 particle-reinforced 2024 aluminium alloy composites

Production and mechanical properties of Al2O3 particle-reinforced 2024 aluminium alloy composites

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

Microstructure and Mechanical Properties of Alumina-Dispersed Magnesium Fabricated Using Mechanical Alloying Method

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