Damage initiation in metal matrix composites

Bréchet, Y.; Embury, J.D.; Shi, Tao; Luo, Lucy

doi:10.1016/0956-7151(91)90146-r

Cited by 220 publications

(60 citation statements)

References 7 publications

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“…In general, the flow behavior during tensile deformation at a given strain can be considered as a combination of the particle damage, its evolution, and the corresponding strain-hardening behavior. 11) This important point is confirmed in the present work.…”

Section: Introductionsupporting

confidence: 81%

“…These figures also show a comparison between the tensile flow stress and the strain-hardening rate from the model represented by eqs. (10) and (11). The k values used in this case are equal to 2.75, 3.25, 3.5, and 3.85, corresponding to the samples reinforced with 5, 10, 15, and 20 vol%, respectively, of particles, for best fitting of flow stresses using these equations.…”

Section: Estimation Of Q and Kmentioning

confidence: 99%

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Effect of Volume Fraction on the Flow Behavior of Al-SiC Composites Considering the Spatial Distribution of Delaminated Particles

et al. 2008

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The effect of the volume fraction of second-phase particles on the distribution of damaged particles and its relation to the tensile deformation behavior were investigated in the particle reinforced metal-matrix composites, Al-SiC. The spatial distributions of all SiC particles and the delaminated SiC particles were evaluated from their two-dimensional local number (LN2D). During tensile deformation, larger SiC particles in more highly clustered regions were more easily delaminated at the particle/matrix interface. The amount of particle delamination in the more highly clustered region increased with increasing volume fraction and strain during tensile deformation. A model was developed to explain the flow behavior of the composites; this showed a good fit to the experimental results in the presence of particle damage, especially when the spatial distribution of damaged particles was taken into consideration.

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Section: Introductionsupporting

confidence: 81%

Section: Estimation Of Q and Kmentioning

confidence: 99%

Effect of Volume Fraction on the Flow Behavior of Al-SiC Composites Considering the Spatial Distribution of Delaminated Particles

et al. 2008

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“…Any improvement occurring in impact toughness will necessarily be dictated by type, shape, size, and distribution of second-phase particles present in the alloy microstructure. 143 ' 144 This section will discuss the effects of additives which were introduced for the purposes of the current study regarding the relevant aspects of impact properties.The effects of additives on the impact energies of the Alloying Groups I, II, and III are illustrated in Figures 5.17, 5.18, and 5.19, respectively, for both 180°C and 220°C tempers. The values for the crack initiation energy, Ej, and the total absorbed energy, Et, were plotted simultaneously on the same graph in order to facilitate deducing the crack 143 propagation energy E p from their difference.…”

mentioning

confidence: 99%

Effect of additives on the mechanical properties and machinability of a new aluminum-copper base alloy /

Elgallad¹

2010

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The present dissertation is aimed at investigating the effects of additives on the mechanical properties and machinability of the 220 alloy which is a new Al-2%Cu-1.3%Si-0.4%Mg casting alloy intended for automotive applications. The research involved here was accomplished through two types of study: (i) study of mechanical properties; (ii) and study of machinability. The study of mechanical properties was proposed to examine the effects of Sr, Ti, Zr, Fe, Mn, and Ag as well as of free-cutting elements, specifically Sn and Bi, on the mechanical properties of the 220 alloy in both the as-cast and heat-treated conditions. The mechanical properties in question include tensile, hardness, and impact properties which were all evaluated at room temperature. The study of machinability was devoted to examining the drilling and tapping performance of four 220 based-alloys as well as of A206 alloy which was selected for a comparative study on the machinability of this particular alloy and that of 220 alloy. The four 220 based-alloys were selected from amongst the alloys prepared in the first study and include: (i) 220 alloy; (ii) 220 alloy + Ti + Zr; (iii) 220 alloy + Ti + Zr + Sn; and (iv) 220 alloy + Ti + Zr + Bi. The machining performance was evaluated based on the calculation of the cutting force, cutting moment, and tool life, as well as on the investigation of chip characteristics. Tool life was expressed as the number of holes drilled/tapped up to the point of tool breakage.An assessment of the microstructure reveals that A^Cu, AlsMggSiôC^, and the Chinese script-like a-Ali5(Fe,Mn)3Si2 phases are the main microstructural constituents of the 220 alloy. The absence of free Si in the microstructure implies that the Si-content was consumed in the formation of the Al-Fe-Si and Al-Cu-Mg-Si intermetallic phases. The platelet-like /?-AlsFeSi phase was not in evidence because of the higher Mn:Fe ratio (~1) of the 220 alloy which promotes the formation of the a-Fe phase at the expense of the /?-Fe phase. The addition of Sr refines the morphology of the ct-Fe Chinese script phase to a certain extent, resulting in the even distribution of the particles of this phase within the aluminum matrix. The combined addition of Ti and Zr causes a reduction in the grain size by about 68% compared to the non-grain-refined base 220 alloy. This reduction may be ascribed to the formation of Zr-Ti particles which act as nucleation sites for small equiaxed grains of cc-Al. Tin precipitates in the form of /?-Sn particles which appear as small non-uniformly distributed clusters usually solidified within the AbCu phase network. Bismuth and /?-Sn particles were found undissolved in the Almatrix after heat treatment, thereby making it possible to induce their free-cutting action during machining.Results from the evaluation of the mechanical properties show that, because of the low Si content, the effects of Sr on the mechanical properties with respect to the modification of silicon eutectic do not come into play. The role of Sr in refining th...

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“…On the other hand, the 25 mass% coarse TiC containing sample has the lowest flexural strength of all. It may be explained by Brechet et al 11) that larger particles also have tendency for earlier cracking initiation. Therefore, fine TiC particles are slightly more effective in resisting local crack propagation due to increased number of hard phase barriers.…”

Section: Flexural Strength Measurementsmentioning

confidence: 97%

Effects of Particle Size on Mechanical Properties of a TiC Containing Tool Steel by Hot Isostatic Press

et al. 2008

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0-25 mass% of $2 um and $20 um TiC powders are added to vanadium and chromium containing steel powders to form metal matrix composite tool steels. The metal and ceramic powders are encapsulated and hot isostatically pressed for densification. Their density and mechanical properties are characterized. Product densification of over 99.9% theoretical density is achieved. Its hardness is found to increase with the amount of TiC addition. Product with over HRc65 hardness is obtained with addition of 25 mass% coarse TiC particles in which the matrix and strengthening particles intermix uniformly. The fine TiC particles distributed as packs at the intergranular regions of the matrix phase and give less hardening effects. The flexural strength is reduced by TiC addition regardless of TiC particle size, because the flexural strength is controlled mainly by crack initiation and less by crack propagation. For impact test, brittle fracture is induced by high strain rate which initiates the cracks with ease in both matrix and hard phases. The impact toughness is thus increased slightly with TiC showing fine particles are more effective in blocking crack tip propagation in high strain rate testing condition.

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Damage initiation in metal matrix composites

Cited by 220 publications

References 7 publications

Effect of Volume Fraction on the Flow Behavior of Al-SiC Composites Considering the Spatial Distribution of Delaminated Particles

Effect of Volume Fraction on the Flow Behavior of Al-SiC Composites Considering the Spatial Distribution of Delaminated Particles

Effect of additives on the mechanical properties and machinability of a new aluminum-copper base alloy /

Effects of Particle Size on Mechanical Properties of a TiC Containing Tool Steel by Hot Isostatic Press

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