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The Effects of Aging on the Hardness and Wear Behaviour of 2124 Al Alloy/B₄C Composites

100%
Öksüz K., Oskay K.
Acta Physica Polonica A
|
2015
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vol. 127
|
issue 4
1367-1369
EN
The particulate reinforced aluminum alloy matrix composites are being increasingly used for wear component applications. The influence of matrix aging treatment on wear behavior in a powder metallurgy 2124 Al-B₄C composite was investigated. The aging responses of 2124 Al-B₄C metal matrix composite (MMC) and unreinforced matrix alloy are studied and related to variations in wear resistance properties. The MMC is aged resolution treated. Accelerated aging occurs in both MMC conditions, compared with unreinforced alloy. Wear resistance and hardness were substantially higher in the reinforced alloys. The effects of the percentage of boron carbide addition on the microstructure, hardness and wear tests of the produced material are discussed. The effects of the age hardening process are also considered.
2
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Effect of Molding Condition on Waviness Profile of GFRP Composites in Compression Molding

100%
Kim J., Kim H., Lee D.
Acta Physica Polonica A
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2013
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vol. 123
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issue 2
337-340
EN
During compression molding of glass fiber reinforced plastic composites, annealing and quenching experiment is conducted by changing pre-heating and cooling method. As results, major cause of unevenness that affects waviness profile (winding) is the shrinkage of matrix during holding and cooling process. Waviness profile of the surface on molding in glass fiber reinforced plastic composites will be lower when holding pressure load is higher, mold temperature is lower during demolding, and cooling rate is slower. In addition, surface roughness of moldings is depending on holding pressure load compared with mold temperature. According to molding condition of glass fiber reinforced plastic composites, waviness profile of surface can be quantitatively estimated using the proposed equation.
3
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Neutron Diffraction Study and Deformation Behavior of a Composite Based Mg Alloy Reinforced by Short Saffil Fibers

100%
Farkas G., Máthis K., Pilch J.
|
EN
In the present work neutron diffraction has been applied for ex situ investigation of residual stresses in Mg-4%Al-1%Ca (AX41) magnesium alloy reinforced with short Saffil fibers. Samples were deformed in compression at room temperature. Two types of fiber arrangement were investigated. In both samples the fibers were homogeneously distributed and arranged in parallel planes with a random fiber orientation. In the first sample these planes were parallel with the loading axis and in the second one they were perpendicular to the loading direction. Significant dependence of both the mechanical properties and residual strains on the fibers orientation was observed. Sample with parallel fiber arrangement showed higher hardness and lower ductility. Further the increment of residual tensile lattice strain in the matrix with a macroscopic deformation is much higher than in the other case. It was found that the residual strain evolution strongly depends on the orientation of grains in the matrix.
4
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Effect of Yttria on the Phase Formation and Sintering of HA-Al₂O₃ Biocomposites

88%
Öksüz K., Özer A.
Acta Physica Polonica A
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2017
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vol. 131
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issue 3
576-579
EN
Hydroxyapatite is very-well known as the main component of hard tissues and, as such, it has attracted much attention by researchers in the recent decades. This study was aimed to present the characterization of Y₂O₃ doped 50 wt.% hydroxyapatite - 50 wt.% Al₂O₃ composite materials fabricated at relatively high temperature of 1600°C. Hydroxyapatite powder was obtained from bovine bones via calcination and ball milling technique. Fine powders ( ≤ 1 μm) of hydroxyapatite/Al₂O₃ were admixed with 0.5 and 1 wt.% Y₂O₃ powders. Powder compacts were sintered at 1600°C for 4 h in air atmosphere. The field emission scanning electron microscopy, energy-dispersive spectroscopy and X-ray diffraction studies following the relative density measurements were conducted. Moreover, the microhardness was studied as the mechanical property of sintered samples. The effect of increasing Y₂O₃ content on surface morphology, elemental distribution and phase evaluation was investigated in hydroxyapatite/Al₂O₃ biocomposite materials. It was found that by increasing Y₂O₃ content, the relative density increased up to 98.8%, while the hardness increased to 863 HV_{(0.2)}. The main phases, which were found, are Hibonite - CaO(Al₂O₃)₆ and beta-tricalcium phosphate - Ca₃(PO₄)₂, according to X-ray diffraction pattern.
5
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Processing and Mechanical Properties of B₄C/Diamond Impregnated Fe/Co MMC

88%
Öksüz K., Şimşir M.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
1139-1141
EN
Cobalt is currently used in the production of diamond reinforced metal matrix composites (i.e. stone-cutting tools). Herein, how sintering temperature and matrix composition influences the material properties of diamond reinforced MMCs was explored. The aim of this work is to produce diamond reinforced metal matrix composites based on Fe-Co compositions with and without B₄C are processed by a PM method using a hot pressing technique. The effects of Fe and B₄C additions on the characteristic of diamond impregnated Co matrix composites have been investigated. Samples reinforced with and without B₄C having two different compositions (different Fe/Co ratio) were produced under 25 MPa pressure and sintered at 1000°C temperature. After sintering, hardness tests were carried out and wear tests were performed by pin-on-disc. The results showed that addition of Fe caused slightly decrease in the hardness of the matrix. However, reinforcing with B₄C increased the hardness of the matrix. It is observed that wear resistance of B₄C reinforced Fe-Co metal matrix composite was greater than that of composites without reinforcement. SEM and EDX techniques were used to characterize the composites.
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