Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8948432 | Ceramics International | 2018 | 47 Pages |
Abstract
Near-fully dense Al-12Si matrix composites reinforced with TiB2 ceramic particles (2â¯wt%) were successfully fabricated by selective laser melting (SLM) and hot pressing (HP) of powder mixtures. TiB2 ceramic particles are homogeneously distributed in the Al-12Si matrix at the micrometer-scale owing to a very good wetting between molten Al-12Si alloy and TiB2 ceramic. The microstructural analysis of the as-fabricated SLM samples show the formation of a supersaturated α-Al phase and the decrease of free residual Si with respect to the hot-pressed ones. Both composites exhibit a fine microstructure with a grain size of ~â¯5.1â¯Âµm and ~â¯5.8â¯Âµm for SLM- and HP-fabricated samples with addition of TiB2 ceramic particles. The SLM Al-12Si/TiB2 composite exhibits significantly improved microhardness (~â¯142â¯Â±â¯6.0 HV0.05) and yield strength (~247â¯Â±â¯4.0â¯MPa) compared to the corresponding HP one. Fine cell morphology and nanostructured dispersion strengthening are responsible for the improved mechanical strength of the Al-12Si/TiB2 composite processed by SLM.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
L.X. Xi, H. Zhang, P. Wang, H.C. Li, K.G. Prashanth, K.J. Lin, I. Kaban, D.D. Gu,