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Article

Comparative Fatigue Study of Age Hardening Al-alloys Under Residual Stress Effects

1IS2M Laboratory, Mechanical Engineering, University of Tlemcen, Tlemcen, Algeria

2Physics Department, University of Tlemcen, Tlemcen, Algeria

3LMSR Laboratory, Department of Mechanical Engineering, University of Sidi Bel Abbes


American Journal of Materials Science and Engineering. 2014, 2(1), 7-12
DOI: 10.12691/ajmse-2-1-2
Copyright © 2014 Science and Education Publishing

Cite this paper:
M. Benachour, N. Benachour, M. Benguediab. Comparative Fatigue Study of Age Hardening Al-alloys Under Residual Stress Effects. American Journal of Materials Science and Engineering. 2014; 2(1):7-12. doi: 10.12691/ajmse-2-1-2.

Correspondence to: M.  Benachour, IS2M Laboratory, Mechanical Engineering, University of Tlemcen, Tlemcen, Algeria. Email: bmf_12002@yahoo.fr

Abstract

In this study, applied tensile plastic preload in 2024 and 7075 Al-alloys plates with central hole generate residual stress field. Around the central hole compressive residual stress was generated when finite element method was used and Von Mises criterion was applied for plastic preload. The level of compressive residual stress increase in increasing of applied plastic preload. Fatigue life and fatigue crack growth rate (FCGR) depend on the level of plastic preload. Consequently fatigue life increase and FCGR decrease. No high effect of level of applied plastic preload was shown for 7075 Al-alloy on fatigue behavior.

Keywords

References

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Article

Structural and Optical Properties of Different Composition of Se90Cd10-xInx thin Films by Vacuum Evaporation Technique

1Amorphous Semiconductor Research Lab, Department of Physics, Madan Mohan Malaviya University of Technology, Gorakhpur

2Department of Physics, Banaras Hindu University, Varanasi


American Journal of Materials Science and Engineering. 2014, 2(2), 13-17
DOI: 10.12691/ajmse-2-2-1
Copyright © 2014 Science and Education Publishing

Cite this paper:
D.K. Dwivedi, Nitesh Shukla, H.P. Pathak, Kedar Singh. Structural and Optical Properties of Different Composition of Se90Cd10-xInx thin Films by Vacuum Evaporation Technique. American Journal of Materials Science and Engineering. 2014; 2(2):13-17. doi: 10.12691/ajmse-2-2-1.

Correspondence to: D.K.  Dwivedi, Amorphous Semiconductor Research Lab, Department of Physics, Madan Mohan Malaviya University of Technology, Gorakhpur. Email: todkdwivedi@gmail.com

Abstract

Se90Cd10-xInx (x=2,4,6 &8) thin films have been deposited onto a chemically cleaned glass substrate by thermal evaporation technique under vacuum. The effects of different doping concentration of In have been investigated X-ray diffraction technique has been employed to investigate the structural characterization of the films. X-ray diffraction measurement indicates that the Se90Cd10-xInx films possess polycrystalline structure. Absorption spectra measured at normal incidence in the wavelength range 400-1100 nm have been analyzed for the optical characterization of the thin films under consideration. The optical constants (absorption coefficient (α), extinction coefficient (k)) and optical band gap Eg have been calculated. The absorption coefficient (α) is found to increase with photon energy. It has been found that extinction coefficient (K) decreases with increase in wavelength (λ). Optical band gap (Eg) has also been evaluated for the Se90Cd10-xInx thin films with different compositions. It has been found that optical band gap (Eg) increases with In incorporation in Se90Cd10-xInx alloys.

Keywords

References

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Article

Electrodeposition of Nanostructured ZnO Thin Film: A Review

1Department of Material Science & Metallurgical Engineering, MANIT, Bhopal, India


American Journal of Materials Science and Engineering. 2014, 2(2), 18-23
DOI: 10.12691/ajmse-2-2-2
Copyright © 2014 Science and Education Publishing

Cite this paper:
Manish Kumar, C. Sasikumar. Electrodeposition of Nanostructured ZnO Thin Film: A Review. American Journal of Materials Science and Engineering. 2014; 2(2):18-23. doi: 10.12691/ajmse-2-2-2.

Correspondence to: Manish  Kumar, Department of Material Science & Metallurgical Engineering, MANIT, Bhopal, India. Email: manishkumar19me@gmail.com

Abstract

In this review paper, a critical analysis was carried out to investigate the effect of cathodic potential, bath temperature, time and nature of substrates on the ZnO thin films synthesized by electrodeposition technique. XRD patterns of the various deposited films were studied to examine the structural characteristics of the Nanostructured ZnO thin films. From the XRD patterns of the different ZnO thin films, it is found that the nanostructured ZnO film had hexagonal wurtzite crystal structure and the crystals were preferably grown along the (002) or (101) planes. The optical properties: Band gaps, transmittance of films, deposited on ITO/FTO coated glass substrates, were also studied by the various optical transmittance spectra. The band gap energy of the deposited ZnO thin films found varying from 3.18 to 3.85eV. Annealing of electrodeposited films decreased the bandgap considerably. Depending on the crystal size, the transmittance of the nanostructured ZnO thin film was found to be about 70 to 90%.

Keywords

References

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[31]  Belavalli E. Prasad, P. Vishnu Kamath and S. Ranganath, “Electrodeposition of ZnO coatings from aqueous Zn(NO3)2 baths: effect of Zn concentration, deposition temperature, and time on orientation,” J Solid State Electrochem (2012) 16: 3715-3722.
 
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Article

Dielectric Studies of Double Sintered Lithium Zinc Nickel Ferrite Prepared by Citrate Precursor Method

1Department of BS&H (Physics), NIT Manipur, Takyel, Imphal, India

2Department of Physics, Manipur University, Canchipur, Imphal, India


American Journal of Materials Science and Engineering. 2014, 2(2), 24-27
DOI: 10.12691/ajmse-2-2-3
Copyright © 2014 Science and Education Publishing

Cite this paper:
Ibetombi Soibam, N Nilima, S Phanjoubam. Dielectric Studies of Double Sintered Lithium Zinc Nickel Ferrite Prepared by Citrate Precursor Method. American Journal of Materials Science and Engineering. 2014; 2(2):24-27. doi: 10.12691/ajmse-2-2-3.

Correspondence to: Ibetombi  Soibam, Department of BS&H (Physics), NIT Manipur, Takyel, Imphal, India. Email: ibetombi96@gmail.com

Abstract

Ni substituted Li-Zn ferrites with compositional formula Li0.4-0.5xZn0.2NixFe2.4-0.5xO4 where 0.02 ≤ x ≤ 0.1 in steps of 0.02 was fabricated by using citrate precursor method. X-ray diffraction was used to confirm the spinel phase. The dielectric constant was investigated as a function of composition, frequency and temperature. Room temperature dielectric constant showed a decrease with addition of Ni2+ ions. It was explained in terms of space charge polarization and koops two layer model. The variation in dielectric constant with frequency showed dispersion. Variation of dielectric constant with temperature was studied at different frequencies and an increase was observed as temperature rises. The possible mechanisms responsible for the above behavior are explained.

Keywords

References

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Article

A Review of Conventional and Contemporary Luting Agents Used in Dentistry

1Department of Conservative Dentistry & Endodontics, Vishnu Dental College, Bhimavaram, West Godavari, Andhra Pradesh, India

2Department of Dental Materials, Vishnu Dental College, Bhimavaram, West Godavari, Andhra Pradesh, India

3Department of Prosthodontics, Vishnu Dental College, Bhimavaram, West Godavari, Andhra Pradesh, India

4Department of Orthodontics, Vishnu Dental College, Bhimavaram, West Godavari, Andhra Pradesh, India


American Journal of Materials Science and Engineering. 2014, 2(3), 28-35
DOI: 10.12691/ajmse-2-3-1
Copyright © 2014 Science and Education Publishing

Cite this paper:
Sita Ramaraju DV, Rama Krishna Alla, Venkata Ramaraju Alluri, Raju MAKV. A Review of Conventional and Contemporary Luting Agents Used in Dentistry. American Journal of Materials Science and Engineering. 2014; 2(3):28-35. doi: 10.12691/ajmse-2-3-1.

Correspondence to: Rama  Krishna Alla, Department of Dental Materials, Vishnu Dental College, Bhimavaram, West Godavari, Andhra Pradesh, India. Email: ramakrishna.a@vdc.edu.in

Abstract

The selection of an appropriate luting agent influences the long-term clinical success of fixed prosthodontic restorations. There are varieties of luting agents available from conventional water-based to contemporary adhesive resin cements. However, no single luting agent is capable of meeting all the stringent requirements. Introduction of adhesive resin systems has completely changed the face of fixed prosthodontic practice leading to an increased use of bonded all-ceramic crowns and resin-retained fixed partial dentures. This review aims at presenting an overview of current cements and discusses physical properties, biocompatibility and other properties that make particular cement the preferred choice depending on the clinical indication.

Keywords

References

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Article

Effect of Pd2+ Doped on the Growth, Optical, Mechanical and Dielectric Properties of KAP Single Crystal

1Department of Physics, Dhirajlal Gandhi College of Technology, Salem, Tamilnadu, India

2Centre for Research and Development, Mahendra Educational Institutions, Tiruchengode, Tamilnadu, India


American Journal of Materials Science and Engineering. 2014, 2(3), 36-41
DOI: 10.12691/ajmse-2-3-2
Copyright © 2014 Science and Education Publishing

Cite this paper:
Viji niraimathi, V. Aroulmoji, G. Rajarajan. Effect of Pd2+ Doped on the Growth, Optical, Mechanical and Dielectric Properties of KAP Single Crystal. American Journal of Materials Science and Engineering. 2014; 2(3):36-41. doi: 10.12691/ajmse-2-3-2.

Correspondence to: Viji  niraimathi, Department of Physics, Dhirajlal Gandhi College of Technology, Salem, Tamilnadu, India. Email: vijiniraimathi@yahoo.com

Abstract

In the present investigation, we have successfully grown optically transparent single crystals from aqueous solution by slow evaporation technique. The influence of dopant Pd2+ on the growth process, crystalline properties of potassium acid phthalate (KAP) has been investigated. Powder XRD and ICP-OES studies confirmed the Pd2+ ion doping into KAP crystals. The modes of vibration in the crystal lattice have been determined by FTIR analysis. Optical transmission studies were carried out by allowing the UV-NIR ray of wavelength between 190 and 1000 nm, which is to pass through the (010) face of the grown KAP crystals and the results confirm that both the pure and doped KAP single crystal shows good transparency in the entire visible region, which is suitable for optical device applications. TGA studies reveal that the purity of the sample and no decomposition is observed below the melting point. Microhardness studies reveal that the Pd2+ doped crystals have higher hardness values than that of pristine KAP. Dielectric constant value of Pd2+ doped KAP at 100 Hz was found to be extensively higher than that of pristine KAP. The Pd doping significantly improves the second harmonic generation (SHG) efficiency of the KAP host crystal.

Keywords

References

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Article

Dielectric Studies of Single and Double Sintered Ni Substituted Li-Zn Ferrite

1Department of BS&H (Physics), NIT Manipur, Takyelpat, Imphal, India


American Journal of Materials Science and Engineering. 2014, 2(3), 42-44
DOI: 10.12691/ajmse-2-3-3
Copyright © 2014 Science and Education Publishing

Cite this paper:
Ibetombi Soibam, Sanatombi S. Dielectric Studies of Single and Double Sintered Ni Substituted Li-Zn Ferrite. American Journal of Materials Science and Engineering. 2014; 2(3):42-44. doi: 10.12691/ajmse-2-3-3.

Correspondence to: Ibetombi  Soibam, Department of BS&H (Physics), NIT Manipur, Takyelpat, Imphal, India. Email: ibetombi96@gmail.com

Abstract

Ni substituted Li-Zn ferrites with compositional formula Li0.4-0.5xZn0.2NixFe2.4-0.5xO4 where 0.02 ≤ x ≤ 0.1 in steps of 0.02 was synthesized by using citrate precursor method. X-ray diffraction was used to confirm the spinel phase. A series of sample was given sintering at 1080C and another series given sintering at 1080C after a pre-sintering at a temperature of 600C. The dielectric constant was investigated as a function of composition and frequency for the two series. Room temperature dielectric constant showed a decrease with addition of Ni2+ ions. It was explained in terms of space charge polarization and koops two layer model. For both the series the variation in dielectric constant with frequency showed dispersion. The possible mechanism responsible for the above behavior is being discussed.

Keywords

References

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[5]  I Soibam, S Phanjoubam, C Prakash, J. Alloys Compd., 475, 328, 2009.
 
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Article

Property Evaluation of Hybrid OPEBF/Banana/Glass Fiber Reinforced Unsaturated Polyester Composites

1Department of Mechanical Engineering, Main Campus, University of Abuja, Abuja, FCT, Nigeria

2Department of Mechanical Engineering, Ahmadu Bello University, Samaru- Zaria, Kaduna State, Nigeria


American Journal of Materials Science and Engineering. 2014, 2(4), 45-53
DOI: 10.12691/ajmse-2-4-1
Copyright © 2014 Science and Education Publishing

Cite this paper:
Ishaya M. Dagwa, Josiah O. Ohaeri. Property Evaluation of Hybrid OPEBF/Banana/Glass Fiber Reinforced Unsaturated Polyester Composites. American Journal of Materials Science and Engineering. 2014; 2(4):45-53. doi: 10.12691/ajmse-2-4-1.

Correspondence to: Ishaya  M. Dagwa, Department of Mechanical Engineering, Main Campus, University of Abuja, Abuja, FCT, Nigeria. Email: dagwaim@gmail.com

Abstract

The physical (density and water absorption) and mechanical (tensile, flexural, impact and hardness) properties of banana empty fruit bunch fiber -glass fiber- oil palm empty fruit bunch particles- reinforced polyester composite were investigated. The natural fibers were extracted and processed locally. Thereafter, the test specimens were prepared using polyester resin with different compositions and prepared in accordance with ASTM standards. The results showed that as the banana fiber content was increased, there was a corresponding decline in the flexural strength. However, increasing the glass fiber content resulted in a corresponding increase in flexural strength. Composite with OPEBF 5 wt % banana fiber 10wt% /glass fiber10 (wt%) produced high impact strength of 55.556J/m2 representing 1568.67% improvement over that of the virgin unsaturated polyester. It was discovered that banana fiber of 15wt% and glass fiber of 5wt% hybrid composite had the highest hardness (3.55HV) representing 136.67% improvement on the hardness of the polyester (1.5HV). It was observed that the hardness of the samples was influenced by increase in banana fiber content in the composite. Thus, banana fiber composite could be considered for applications in areas where high impact strength is a requirement such as in some parts of automobile vehicle.

Keywords

References

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Article

Effect of Variation in Magnesium and Copper on Mechanical Properties of X7475 Aluminium Alloy

1Department of Mechanical Engineering, University of Agriculture, Makurdi, Nigeria

2Department of Research, Collaboration and Consultancy, National Centre for Technology Management (NACETEM), Abuja, Nigeria


American Journal of Materials Science and Engineering. 2014, 2(4), 54-61
DOI: 10.12691/ajmse-2-4-2
Copyright © 2014 Science and Education Publishing

Cite this paper:
L.T. Tuleun, J.D. Amine, K. Abubakar. Effect of Variation in Magnesium and Copper on Mechanical Properties of X7475 Aluminium Alloy. American Journal of Materials Science and Engineering. 2014; 2(4):54-61. doi: 10.12691/ajmse-2-4-2.

Correspondence to: K.  Abubakar, Department of Research, Collaboration and Consultancy, National Centre for Technology Management (NACETEM), Abuja, Nigeria. Email: kz4tawa@gmail.com

Abstract

Aluminium (Al) alloys are employed, from aerospace, automotive body panel, building industry to kitchen wares. This paper attempts to close an existing gap in the usage and variation in the percentage weight (% w.t.) of two constituents [Magnesium (Mg) and Copper (Cu)] in Al alloy and evaluate the impact of such variations on yield strength in N/mm2 and percentage elongation (% e) at ambient temperature. Experimental X7475 alloy was prepared from constituents drawn from 6 % Zn, 2.5 % - 3.5 % Mg, 1.8 % - 3.0 % Cu, 0.03 % Mn, 0.23 % Cr and Al as balance in all cases. The result revealed that yield strength increased with increase in Mg and decreased with increase in Cu as a maximum yield strength of 384.57 N/mm2 was displayed by an alloy of 2.5 % Mg, 3.0 % Cu while the least yield strength of 130.00 N/mm2 was recorded by an alloy of 3.5 % Mg, 3.0 % Cu. Ductility (% e) increased with increase in Cu. The paper submitted that mechanical properties of Al alloys depend not only on the content of alloying elements, but also on their relative chemistries with each other, impact of impurities and heat treatments.

Keywords

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Article

Synthesis of Chitosan-graft-Polyaniline-Based Composites

1Department of Chemistry, Govt. Institute of Science & Humanities Amravati, India


American Journal of Materials Science and Engineering. 2014, 2(4), 62-67
DOI: 10.12691/ajmse-2-4-3
Copyright © 2014 Science and Education Publishing

Cite this paper:
S.R. Khairkar, A.R. Raut. Synthesis of Chitosan-graft-Polyaniline-Based Composites. American Journal of Materials Science and Engineering. 2014; 2(4):62-67. doi: 10.12691/ajmse-2-4-3.

Correspondence to: S.R.  Khairkar, Department of Chemistry, Govt. Institute of Science & Humanities Amravati, India. Email: shyamkhairkar@gmail.com

Abstract

Chitosan was grafted with polyaniline through oxidative-radical copolymerization using ammonium persulfate in acidic medium. The grafting conditions were extensively studied by varying grafting parameters. All the findings have been discussed and proposed a plausible mechanism for the graft copolymerization. The representative chitosan-graft-polyaniline (Ch-g-PANI) was characterized using UV-VIS, FTIR, DSC, XRD and Scanning electron microscopy taking chitosan as reference. Ch-g-PANI exhibited electrical conductivity, which increases with the extent of grafting onto chitosan backbone. The application of conducting biomaterial such as Ch-g- PANI in the electronic devices especially for the fabrication of sensor devices would be attractive not only in terms of product cost and environmental safety but also from a materials science point of view.

Keywords

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