Fracture toughness behaviour of a magnesium alloy metal-matrix composite produced by the infiltration technique

Purazrang, K.; Kainer, Karl Ulrich; Mordike, B. L.

doi:10.1016/0010-4361(91)90205-u

Cited by 74 publications

(29 citation statements)

References 3 publications

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“…One of the methods of ensuring that is to investigate the fracture toughness. There are some reports on the fracture toughness in magnesium alloys [1][2][3][4][5] and magnesium. 6) However, the value of fracture toughness in magnesium alloys has been generally reported to be much lower than that in aluminum alloys.…”

Section: Introductionmentioning

confidence: 99%

Fracture Toughness in an Extruded ZK60 Magnesium Alloy

Somekawa

Mukai

2006

Mater. Trans.

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Examination of fracture toughness has been performed a commercial Mg-Zn-Zr alloy, ZK60, with fine strengthening particles. The commercial alloy was extruded at 633 K, and then heat treated at specific conditions. The microstructures were equi-axed grains, and average grain size and precipitate size were 11.6 mm and 50-150 nm, respectively. The yield strength and elongation-to-failure were 225 MPa and 17.0%. The plane-strain fracture toughness, K IC , was estimated to be 20.6 MPam 1=2 in stretched zone analysis. From ductile fracture model, all the finer particles did not affect the void formation. The precipitates having a large diameter, more than 100 nm, were supposed to be the origin of void formation.

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Section: Introductionmentioning

confidence: 99%

Fracture Toughness in an Extruded ZK60 Magnesium Alloy

Somekawa

Mukai

2006

Mater. Trans.

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“…The decrease in grain size in extruded magnesium was observed to increase K IC . [13] Purazrang et al [14] observed that squeeze-cast AZ91 alloy has K IC 14:4 MPaÁ ffiffiffiffi m p…”

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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“…One of the methods of ensuring that is to investigate the fracture toughness. There have been some reports on the fracture toughness in magnesium alloys [1][2][3][4][5] and magnesium. 6) However, the value of fracture toughness in magnesium alloys has been generally reported to be much lower than that in aluminum alloys.…”

Section: Introductionmentioning

confidence: 99%

Synergetic Effect of Grain Refinement and Spherical Shaped Precipitate Dispersions in Fracture Toughness of a Mg-Zn-Zr Alloy

2007

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Fracture toughness was examined on a commercial Mg-Zn-Zr alloy, ZK60. The commercial alloy was extruded at a temperature of 493 K to obtain fine grain structures having fine spherical shaped precipitates. The microstructures consisted of equi-axed grains. The average grain size and the precipitate diameter were about 3 mm and 25 $ 50 nm, respectively. The yield strength and elongation-to-failure were 287 MPa and 26.7%, respectively. The plane-strain fracture toughness, K IC , was estimated to be 34.8 MPam 1=2 by the stretched zone analysis. These mechanical properties were superior to that of conventional wrought magnesium and magnesium alloys. The deformed microstructure observations showed i) the activation of non-basal dislocations even at room temperature and ii) the pinning of dislocations by the spherical shaped precipitates during the fracture toughness test. Thus, a combination of grain refinement and dispersion of fine spherical shaped precipitates were found to be effective methods for improving the fracture toughness of magnesium alloys.

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Fracture toughness behaviour of a magnesium alloy metal-matrix composite produced by the infiltration technique

Cited by 74 publications

References 3 publications

Fracture Toughness in an Extruded ZK60 Magnesium Alloy

Fracture Toughness in an Extruded ZK60 Magnesium Alloy

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

Synergetic Effect of Grain Refinement and Spherical Shaped Precipitate Dispersions in Fracture Toughness of a Mg-Zn-Zr Alloy

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