The effects of Er addition on the microstructure and properties of an in situ nano ZrB2-reinforced A356.2 composite
Source abstract
Abstract
Abstract In this study, the effects of Er addition on the microstructure and properties of in situ nano A356-3 wt%ZrB 2 composites were investigated. The A356-3 wt%ZrB 2 composite was prepared by an in situ reaction between K 2 ZrF 6 and KBF 4 salts, which were added in the proper stoichiometric ratio to form ZrB 2 in the A356.2 alloy melt at 1123 K(850 °C). The addition of Er could modify the coarse lamellar eutectic Si particles into fine fibrous particles and refine the second dendrite arm spacing (SDAS) of the grains simultaneously. Furthermore, the Er also influenced the distribution and size of the ZrB 2 particles by homogenizing the distribution of the nanoparticles and reducing their size. Tensile testing showed that the ultimate tensile strength (UTS), yield strength (YS) and elongation increased to 325 MPa, 250MPa and 13.65%, respectively, due to the homogeneous distribution of the nanoparticles, the refinement of the SDAS of the α-Al grains and the modification of the eutectic Si particles upon increasing the Er content to 0.05 wt% combined with T6 heat treatment.
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Research context
OpenAlex topics: Aluminum Alloys Composites Properties · Aluminum Alloy Microstructure Properties · Advanced ceramic materials synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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