Effect of hybrid reinforcement on crack initiation and early propagation mechanisms in cast metal matrix composites during low cycle fatigue

Iqbal, Arif; Arai, Yasuhiko; Araki, Wakako

doi:10.1016/j.matdes.2012.09.002

Cited by 39 publications

(16 citation statements)

References 25 publications

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“…The chemical composition of AC4CH alloy is listed in Table 1. As described in the previous report [26], due to the formation process of the preform the whiskers in the hybrid MMC are randomly oriented in a plane. "Longitudinal cross section" is defined as the plane and "lateral cross section" is defined as the one perpendicular to the plane in this article.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 79%

“…At present, studies of cast hybrid MMCs are limited in the investigation of fracture mechanisms and wear properties [25]. Besides, the authors of this article have previously investigated the microcrack initiation and stage by stage growth of the crack to final failure in cast hybrid MMC [26]. They experimentally investigated the hybrid effect on the crack initiation mechanism.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Reinforcement Clustering on Crack Initiation Mechanism in a Cast Hybrid Metal Matrix Composite during Low Cycle Fatigue

Iqbal¹,

Arai²,

Araki³

2013

OJCM

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The reinforcement distribution of metal matrix composites (MMCs) plays an important role in low cycle fatigue. Thus, it is essential to study the effect of reinforcement clustering on the crack initiation mechanism of MMCs. In this study, the effect of reinforcement clustering on the microcrack initiation mechanism in a cast hybrid MMC reinforced with SiC particles and Al 2 O 3 whiskers was investigated experimentally and numerically. Experimental results showed that microcracks always initiated in the particle-matrix interface, located in the cluster of the reinforcements. The interface debonding occurred in the fracture which created additional secondary microcracks due to continued fatigue cycling. The microcrack coalesced with other nearby microcracks caused the final fracture. To validate the experimental results on the microcrack initiation, three dimensional unit cell models using finite element method (FEM) were developed. The stress distribution in both the reinforcement clustering and non-clustering regions was analyzed. The numerical analysis showed that high stresses were developed on the reinforcements located in the clustering region and stress concentration occurred on the particle-matrix interface. The high volume fraction reinforced hybrid clustering region experienced greater stresses than that of the SiC particulate reinforced clustering region and low volume fraction reinforced hybrid clustering region. Besides, the stresses developed on the non-clustering region with particle-whisker series orientation were reasonably higher than that of the non-clustering region with particle-whisker parallel orientation. The high volume fraction reinforced hybrid clustering region is found to be highly vulnerable to initiate crack in cast hybrid MMC during low cycle fatigue.

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Section: Materials and Experimental Proceduresmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Effect of Reinforcement Clustering on Crack Initiation Mechanism in a Cast Hybrid Metal Matrix Composite during Low Cycle Fatigue

Iqbal¹,

Arai²,

Araki³

2013

OJCM

Self Cite

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“…When reinforcement particles are added to the alloy, cracks will originate from the particle‐matrix interface . Ayyar and Chawla studied the crack growth behaviour of SiC particle reinforced Al matrix composites by using actual microstructures. They found that the shielding effect of a reinforcement particle to deflect crack would be significantly reduced or completely lost when the particle ahead of the crack tip is fractured.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Crack Growth and Fracture of 30 wt% B4C/6061Al Composites

Wang

Zhou

et al. 2017

Fatigue Fract Eng Mat Struct

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This paper focuses on studying the fatigue crack growth (FCG) characteristics and fracture behaviours of 30 wt% B4C/6061Al composites fabricated by using powder metallurgy and hot extrusion method. Compact tension (CT) specimens having incisions parallel to the extrusion direction (T‐D) and perpendicular to the extrusion direction (E‐D) were investigated through FCG tests. Results show that, at low/medium stress‐intensity factor range levels (ΔK ≤ 9), crack propagation rate in E‐D specimens is lower than that in T‐D specimens because the elongated B4C particles parallel to the extrusion direction in E‐D specimens can deflect the crack. The scanning electron microscope micrographs of the fractured surface illustrate that crack mainly propagates in the matrix alloy at the initial stage of its propagation and propagates more remarkably near the particle‐matrix interface with the increase of ΔK value. B4C particles are also found to be easy to fracture during the rapid crack propagation. Based on fracture analyses, considering the impacts of factors like crack deviation, plastic zone size at the crack tip, and crack driving force, a 2‐D crack propagation model was developed to study the fatigue crack propagation mechanism in the 30 wt% B4C/6061Al composite.

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“…As for the fabrication method of the MMC, the casting process has advantages in formability and productivity and has been extensively studied. Among many kinds of casting processes, pressure infiltration process 1,2) is widely used for the fabrication of MMC containing a high percentage of reinforcement. In the conventional pressure infiltration method, the alloy melt is forced to infiltrate into the preform of the reinforcement with high pressure (³ 100 MPa 3) ) and brittle fibers tend to be broken into short fibers by the high pressure, which reduces an efficiency of the reinforcements in strengthening the matrix.…”

Section: Introductionmentioning

confidence: 99%

Influence of Interfacial Reaction on Wear Resistance of Aluminum Alloy/SiC Composites Fabricated by Low Pressure Infiltration Process

2015

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Hybrid-MMCs have been fabricated by a low pressure infiltration method, using aluminum alloy as matrix, SiC fiber and SiC particle as reinforcements. Influences of orientation of fibers, interfacial reaction and matrix property on the wear resistance of Hybrid-MMCs have been investigated. The 3D-distribution of SiC fibers in the Hybrid-MMC are effective to prevent SiC particles from dropping out during the wear test. Thin reaction products at the interface between matrix and SiC fiber or SiC particle strengthen the interface bond, which results in an increase in the wear resistance of the Hybrid-MMC. The wear resistance can be improved by the formation of interfacial reaction layer and an age-hardening of the matrix. Volume expansion of the matrix accompanied by the age-hardening of the matrix increases the interface bond strength. The strengthened interface bond protects the reinforcements from dropping out and results in a superior wear resistance of the MMC.

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Effect of hybrid reinforcement on crack initiation and early propagation mechanisms in cast metal matrix composites during low cycle fatigue

Cited by 39 publications

References 25 publications

Effect of Reinforcement Clustering on Crack Initiation Mechanism in a Cast Hybrid Metal Matrix Composite during Low Cycle Fatigue

Effect of Reinforcement Clustering on Crack Initiation Mechanism in a Cast Hybrid Metal Matrix Composite during Low Cycle Fatigue

Fatigue Crack Growth and Fracture of 30 wt% B4C/6061Al Composites

Influence of Interfacial Reaction on Wear Resistance of Aluminum Alloy/SiC Composites Fabricated by Low Pressure Infiltration Process

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