Functionally graded materials produced by laser cladding
By Y. Pei, J. D. De Hosson. 2000
231 citations recorded by the source corpus.
Abstract AlSi40 functionally graded materials (FGMs) were produced by a one-step laser cladding process on cast Al-alloy substrate as a possible solution for interfacial problems often present in laser coatings. The microstructure of the FGMs consists of a large amount of silicon primary particles surrounded by α-Al dendritic halos and by Al/Si eutectic. The Si particles exhibit a continuous increase in both size and volume fraction, from 8.5 μm and 22.7% at the bottom to 52 μm and 31.4% at the top of the FGM layer, respectively. The morphology of the Si particles changes accordingly from a small polygonal shape to a coarsely branched equi-axial shape. The α-Al halos and eutectic areas show less change over the same distance. From an analysis of the temperature field of the laser pool, Si particles heterogeneously nucleate on incompletely melted Si particles. The number density of Si particles is most likely being controlled by the non-homogeneous temperature field of the pool that determines the decomposition of the original Si phase in the AlSi40 powder. The growth rate and time available at different depths of the laser pool mainly affect the final size of Si particles.
Subfields: Ceramics and Composites, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/d02dcdee95a935aee52f4d65708344ed6e8530eb
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In Ceramics and Composites
- Rasheedat Modupe Mahamood
- S. Pityana
- S. Bohidar
- Wei Zhang
- Ritesh Sharma
- Mukul Shukla
- P. Mishra
- J. Eckert
In Mechanical Engineering
Citations in the corpus
- Influence of Annealing on Mechanical Properties of Al-20Si Processed by Selective Laser Melting (2014, background): “A very steep temperature gradient may be produced on the surface of the melted metal [25], consequently, the laser melting treatment induces a high undercooling which may promote heavy branching of the Si crystal into the fibrous morphology [26].”
- Functionally graded material: an overview (2012, methodology): “Laser based SFF process for FGM [22, 23] include: laser cladding based method [9-14, 22, 24-30], Selective Laser Sintering (SLS) [31, 32], 3-D”
- Functionally Graded Materials: A Critical Review (2014, methodology): “Laser based SFF process for FGM [21,22] include: laser cladding”
- Additive manufacturing of metallic components – Process, structure and properties (2018, background): “However, there are times when dissimilar metals may be deposited by AM, such as laser surface cladding [299–301] or fabrication of functionally graded composites [302,303], where nucleation at the melt pool boundary may be required.”