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Journal ArticleDOI

Microstructural analysis, micro-hardness and wear resistance properties of quasicrystalline Al–Cu–Fe coatings on Ti-6Al-4V alloy

22 Jun 2018-Vol. 5, Iss: 6, pp 066538
About: The article was published on 2018-06-22. It has received 31 citations till now. The article focuses on the topics: Indentation hardness.
Citations
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Journal ArticleDOI
TL;DR: In this article, the effect of hybrid coating of Ti-Al-Cu on a grade five titanium alloy (Ti-6Al-4V) using laser metal deposition (LMD) process at different laser process parameters.

14 citations

Journal ArticleDOI
TL;DR: In this article, a comparative analysis between high-velocity oxy-fuel (HVOF) and atmospheric plasma (APS) spraying processes has been done, and detailed structural analysis of deposited coatings were studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD).
Abstract: Iron-based amorphous coatings are getting attention owing to their attractive mechanical, chemical, and thermal properties. In this study, the comparative analysis between high-velocity oxy-fuel (HVOF) and atmospheric plasma (APS) spraying processes has been done. The detailed structural analysis of deposited coatings were studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Mechanical and electrochemical properties were investigated by using micro-Vickers hardness testing, pin-on-disc tribometry and potentiodynamic analysis. The microstructure comparison revealed that HVOF-coated samples had better density than that of APS. The porosity in APS-coated samples was 2 times higher than that of HVOF-coated samples. The comparison of tribological properties showed that HVOF-coated samples had 3.9% better hardness than that of coatings obtained via APS. The wear test showed that HVOF-coated samples had better wear resistance in comparison to APS coatings. Furthermore, the potentiodynamic polarization and electrochemical impedance spectroscopy showed that the HVOF-coated samples had better corrosion resistance in comparison to APS-coated samples.

11 citations

Journal ArticleDOI
TL;DR: In this paper, a 3D numerical investigation was performed to predict micro-structural development and the sizes of the grain growth during the laser-deposition process, which had substantial effects in the overall resulting molten pool size and geometry size.
Abstract: Additive manufacturing is a commercially competitive manufacturing technique with the possibility of altering the entire perception of design and fabrication It offers suitable capabilities for the building and repairing applications in the aerospace industry, which usually requires high level of accuracy and customization of parts which usually use materials known to pose difficulties in fabrication such as titanium alloys The major factors that determine the formation of the dendritic structure are the thermal gradients within the substrate during cooling and the cooling rates The rapid cooling and input of heat locally during the laser deposition process resulted in metallurgical modifications such as the formation of a complete martensitic structure, a mixture of columnar grains and layer of bands During the deposition process, the metal solidified, and the developed model enabled predictability of microstructural development and the sizes of the grain growth The 3D numerical investigation provided clarification and had substantial effects in the prediction of the overall resulting molten pool size and geometry size

5 citations

Journal ArticleDOI
TL;DR: In this article, a medical-grade β-titanium (Ti-35Nb-7Ta-5Zr) alloy was treated using the electrical discharge machining process.
Abstract: In this study, medical-grade β-titanium (Ti–35Nb–7Ta–5Zr) alloy was treated using the electrical discharge machining process. Biofavorable substances, such as multiwalled carbon (C) nanotubes and μ...

5 citations

References
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Journal ArticleDOI
TL;DR: In this paper, the complexity and variety of fundamental phenomena in this material system with a focus on phase transformations and mechanical behaviour are discussed. And the challenges that lie ahead in achieving these goals are delineated.

1,797 citations

Journal ArticleDOI
TL;DR: In this article, a thermodynamically stable quasicrystalline single phase with an icosahedral structure was found to be formed at an atomic composition of Al65Cu20Fe15 in a fully annealed state as well as in a conventionally solidified state.
Abstract: A thermodynamically stable quasicrystalline single phase with an icosahedral structure was found to be formed at an atomic composition of Al65Cu20Fe15 in a fully annealed state as well as in a conventionally solidified state. The stable quasicrystal consisted of large grains with an average size of 0.2 mm after annealing for 48 h at 1118 K (0.98 Tm).

604 citations

Journal ArticleDOI
TL;DR: In this article, the results of using selective laser melting (SLM) to produce CP-Ti parts starting from powder with a wide grain size range up to 100μm were presented.
Abstract: Commercially pure titanium (CP-Ti) has received a great deal of attention in medical applications. Improvement of its mechanical properties plays a key role in enhancing the biomechanical compatibility of Ti implants, leading to avoid revision surgeries. Emerging advanced manufacturing technologies such as selective laser melting (SLM) is providing an ideal platform for producing components with almost no geometric constraints and is economically feasible down to a batch size of one. This study presents the results of using SLM to produce CP-Ti parts starting from powder with a wide grain size range up to 100 μm. Accurate manipulation of SLM manufacturing parameters were applied to produce nearly full dense (>99.5%) CP-Ti parts without any post-treatments. Compared with the properties of those manufactured by traditional processing technologies, the microhardness, compressive, and tensile strengths of SLM-processed CP-Ti parts have been improved to 261 Hv, 1136 MPa, and 757 MPa, respectively, due to the formation of refined martensitic α′ grains during SLM. The optimal manufacturing parameters could enhance the strength and hardness of CP-Ti and yet maintaining the ductility of titanium. Fractography study of the tensile-failed SLM-processed specimens showed that incompletely melted particles and porosities caused early fracture in porous sample. Mixture of dimples and minor quasi-cleavage facets covered most fracture surface of full dense sample.

549 citations

Journal ArticleDOI
TL;DR: A model of production cost for two different Additive Manufacturing systems used commercially for the manufacture of end-use metal parts is constructed, suggesting that the observed deposition rates are not sufficient for the adoption of EBM and DMLS in high volume manufacturing applications.

463 citations

Journal ArticleDOI
TL;DR: In this article, the development of laser cladding for functional coatings with high wear resistance, good corrosion and oxidation resistance, and better medical biocompatibility is reviewed, and the existing problems and the corresponding solutions are discussed.

417 citations