Fatigue and Fracture Behaviors of Discontinuously Reinforced Aluminum Matrix Composites

Wang, Zhong Guang; Li, S.; Sun, Li

doi:10.4028/www.scientific.net/kem.104-107.729

Cited by 23 publications

(13 citation statements)

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“…For particles reinforced metal matrix composites, there are three main types of cracking modes: (i) cracking of the particles, (ii) interfacial debonding at the particle-matrix interface and (iii) cracking in the metal matrix [30][31][32]. For as-deposited composites, some defects and inner stress induced by electrodeposition exist in the particle-matrix interface, so that the mechanical bonding of nickel matrix and SiC particles is weak.…”

Section: Microstructure Of Fracture Surfacementioning

confidence: 99%

Effect of α-Al2O3 coatings on the mechanical properties of Ni/SiC composites prepared by electrodeposition

Liu

Shen

et al. 2012

Materials Science and Engineering: A

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Section: Microstructure Of Fracture Surfacementioning

confidence: 99%

Effect of α-Al2O3 coatings on the mechanical properties of Ni/SiC composites prepared by electrodeposition

Liu

Shen

et al. 2012

Materials Science and Engineering: A

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“…2 The fatigue damage events that commonly occur in particulate‐reinforced MMCs, are mainly described as particulate and/or intermetallic inclusion cracking; matrix cracking, which includes the matrix hardening or softening; and matrix‐particulate interfacial decohesion 1 –5 . 23 –29 Figure 2 shows an example of the fatigue damage in AA6061‐20p‐T6 composites with the test conditions: total strain amplitude Δ ε total /2 = 0.2%, T = −100 °C.…”

Section: The Stochastic Modelling Of Fatigue Damage Processesmentioning

confidence: 99%

“…Much experimental work has been carried out, providing a fairly comprehensive understanding of damage mechanisms developed during the tensile and/or compressive fatigue loading of high‐performance particulate‐reinforced MMCs. These studies have been well reviewed recently, for example in the papers by Clyne and Withers, 1 Allison and Jones, 2 Wang et al 3 . and Wang 4 .…”

Section: Introductionmentioning

confidence: 99%

“…The superior fatigue damage development resistance of the particulate‐reinforced MMC and its dependence on microstructure have been related to the interaction of the fatigue damage development and reinforcing particles, which gives rise to various damage development mechanisms such as crack deflection, crack trapping and bridging 10 ,. 11 As a result of these complex interactions, the properties of the composite microstructural parameters such as volume fraction of reinforcing particles, matrix microstructure and interface, particle size are expected to exert significant influence on the fatigue damage development resistance of the composite 1 –4 …”

Section: Introductionmentioning

confidence: 99%

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A statistical model of fatigue damage evolution in particulate‐reinforced metal‐matrix‐composites

Ding

Biermann

Mughrabi

2000

Fatigue Fract Eng Mat Struct

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A statistical model of fatigue damage evolution has been developed for particulate‐reinforced metal‐matrix‐composites (MMCs) by taking into considerations both the initial damage distribution and the effect of particulate reinforcement on fatigue damage development. The growth of microscopically fatigue‐damaged regions in particulate‐reinforced MMCs is considered as a stochastic process, and both the non‐equilibrium statistical method and minimum strength principle are used to establish the evolution equation of fatigue damage. The fatigue damage evolution equation developed in the present study characterizes not only the kinetic process of fatigue damage evolution but also sets up the relationship between the mechanism of fatigue damage growth of the microscopically damaged regions and the result of fatigue damage, i.e. degradation of mechanical properties of particulate‐reinforced MMCs. A new expression for calculating the cumulative fatigue damage and a new formula for predicting the average fatigue strength of the particulate‐reinforced MMCs are derived. Experimental data of 2080Al/SiCp composites are analysed and compared with results obtained with the present model. It is shown that the experimental results can be described well by the calculations.

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“…5.14. The fracture of particulate reinforced MMCs under tensile loading is controlled by three main mechanisms depending upon the nature of the matrix, reinforcement and interface [124][125]: i) If the matrix is very strong and the local stress exceeds the fracture stress of the reinforcement particle, particle fracture will occur; ii) If the local stress is lower than the particle fracture strength but is higher than interfacial strength, interfacial decohesion occurs; iii) If both the interface and the reinforcement are stronger than the matrix, then fracture takes place by void coalescence of the matrix.…”

Section: Fractographymentioning

confidence: 99%

Joining of Al-B4C metal matrix composites by laser welding and friction stir welding /

Guo¹

2012

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AI-B4C MMCs are important materials as neutron absorber in spent nuclear fuel storage and transportation due to their high boron ( 10 B) concentration and thus high neutron absorption capability. However, wide application of these materials is still limited due to the lack of suitable joining techniques to fully take advantage of the materials. Problems such as porosity and chemical reaction between Al matrix and B4C particles can arise during fusion welding of the material. Therefore, the present study is intended to find effective and reliable welding techniques for AI-B4C MMCs. The weldability of AA1100-16%B 4 C (particle size: 11 pirn) and AA1100-30%B 4 C MMCs (median particle size: 15 pirn) was evaluated using laser welding and friction stir welding. In comparison with conventional arc welding techniques, the deep and narrow fusion zones associated with laser welding can result in smaller heat affected zones, and thus less thermal distortion and mechanical property degradation. On the other hand, friction stir welding, as a solid state process, seems promising as it can avoid various problems that may otherwise be encountered during fusion welding of MMCs.For laser welding without filler, it was found that most B4C particles were decomposed during welding leading to formation of needle-like AIB2 and AI3BC phases in the weld. In this case, a joint efficiency of 63% (UTS) after tensile test was obtained. The variation of laser power from 2 to 4 kW and welding speed from 1 to 2.5 m/min did not affect the needle-like morphology. Based on thermodynamic calculation, Ti filler was used as the filler material aiming to improve the properties of laser joints. It was found that the addition of Ti with 150 |nm thick foil increased the joint efficiency to 75% due to the decrease of size and quantities of needle-like phases. The addition of Ti with filler wire instead of Ti foil did not show significant mechanical property improvement due to the Ti segregation and microstructure inhomogeneity in the weld zone.On the other hand, the feasibility of friction stir welding for joining AA1100 based metal matrix composites reinforced with B 4 C particulate was studied for 16 and 30%B 4 C volume concentrations. For both composites, friction stir welding has a significant influence on the particle size distribution and the matrix grain size. For the AA1100-16%B4C composite, the average particle size decreases after welding by -20% and the grain size from 15 to 5 [xm as measured in the weld nugget. Tensile testing of welded joints showed up to 100% joint efficiency for both annealed AA1100-16%B 4 C and AA1100-30%B4C composite materials. However, if the ultimate tensile strength values of all the studied composites are similar at -130 MPa, the weld ductility is higher for the annealed materials. In addition, it was observed that varying the welding speed between 100 and 275 mm/min does not influence the joint tensile properties and the particle size distribution in the nugget. Furthermore, a welding tool made of WC-Co show...

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Fatigue and Fracture Behaviors of Discontinuously Reinforced Aluminum Matrix Composites

Cited by 23 publications

References 0 publications

Effect of α-Al2O3 coatings on the mechanical properties of Ni/SiC composites prepared by electrodeposition

Effect of α-Al2O3 coatings on the mechanical properties of Ni/SiC composites prepared by electrodeposition

A statistical model of fatigue damage evolution in particulate‐reinforced metal‐matrix‐composites

Joining of Al-B4C metal matrix composites by laser welding and friction stir welding /

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