Functionally graded materials produced by laser cladding

Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. and Si increase the hardness of the material by dispersion hardening but do not contribute to its abrasive wear resistance, because they are softer than the abrasive particles, and confirm that the parameters used to prepare Al-Si-SiC composite coatings by laser cladding must be selected so that only minimal reactions occur between SiC and molten Al.

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“…6c). Several authors have reported a similar solidification mechanism in laser cladding of hypereutectic Al-Si alloys [22,23,27].…”

Section: Discussionmentioning

confidence: 69%

Microstructure and wear studies of laser clad Al-Si/SiC(p) composite coatings

Anandkumar

Almeida

Colaço

et al. 2007

Surface and Coatings Technology

107

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“…One of the most striking findings in our research of laser clad hypereutectic Al-Si functionally graded materials (FGMs) is the fact that so many five-fold Si particles (Si p ) of 25-50 µm in size were observed [12]. In this paper, the results of the microstructural investigations on the five-fold twinning and growth features of the large Si particles are presented and discussed using orientation imaging microscopy (OIM), transmission electron microscopy (TEM) and three-dimensional observations with scanning electron microscope (SEM).…”

Section: Introductionmentioning

confidence: 92%

Five-fold branched Si particles in laser clad AlSi functionally graded materials

Pei

Hosson

2001

Acta Materialia

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Abstract-Many five-fold branched Si particles (Si p ) were observed in Al-40 wt% Si functionally graded materials produced by a single-step laser cladding process on cast Al-alloy substrate. In this paper the fivefold twinning and growth features of Si p are scrutinized with orientation imaging microscopy and electron microscopic examination. It is a more in depth study of formation of the Si particles in functionally graded materials as published in our previous paper [Pei, Y. T. and De Hosson, J. Th. M., Acta mater., 2000, 48, 2617]. These Si particles have grown from twinned decahedron nuclei consisting of five tetrahedrons that share a common 110 axis. The twin plane re-entrant edge (TPRE) mechanism explains both the branch growth in the radial direction and the elongation of Si p along their common 110 axis. Subsequent twinning within the twinned tetrahedrons provides additional re-entrant grooves on their top faces, which are important for the rapid elongation and consequently for the continuous growth of the branched particle. The 7.5°m ismatch that arises by putting together five tetrahedrons around a common 110 axis is accommodated by small-angle grain boundaries (SAGBs). The SAGBs may disturb the progress of growth steps, which causes the particles to branch. The most remarkable facts of the study are that the five-fold branched silicon particles are much bigger (25ෂ40 µm) than the nanometer sizes previously reported in the literature and the 7.5°m ismatch is accommodated mainly by multiple SAGBs. The examples of a single SAGB reported before are just a special case of the SAGB mechanism.

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“…There are various types of SFF innovations, even so, the laser based forms are mostly utilized in creating functional graded material [6]. Laser based SFF process for FGM [7] include: (i) laser cladding based strategy [8,9], and (ii) Selective Laser Sintering (SLS) [10,11]. SFF includes five essential steps [12].…”

Section: Solid Free Form (Sfm) Fabrication Methodsmentioning

confidence: 99%

A brief review of functionally graded materials

et al. 2017

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Abstract.Material engineering has become one of the corner stones in various engineering applications. The scientific alteration of base materials into various inorganic and organic compounds has resulted in the development of Functionally Graded Material (FGM). FGM can be described as a cutting edge material in which the particular material's properties could be made varied as the dimension changes. The aims of this study was to review on FGM's applications and its manufacturing processes. In addition, the mathematical idealization of the FGM was also reviewed. Based on the review, since FGMs are highly heterogeneous, it can be idealized as their mechanical properties changes smoothly with respect to their spatial coordinates. Nonetheless, in order to analyze FGMS in an efficient manner, the homogenization schemes are needed to be simplified from their complicated heterogeneous microstructures. Closed-form solutions of some fundamental solid mechanics' problems can be obtained by this idealization. Conclusively, FGM is unique in relation to any of the individual materials that structures it. Suggestively, this provide a limitless possibility for future engineering applications.

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Functionally graded materials produced by laser cladding

Cited by 225 publications

References 24 publications

Microstructure and wear studies of laser clad Al-Si/SiC(p) composite coatings

Microstructure and wear studies of laser clad Al-Si/SiC(p) composite coatings

Five-fold branched Si particles in laser clad AlSi functionally graded materials

A brief review of functionally graded materials

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