Microstructure, solidification defects and mechanical properties of high-modulus and high-strength SiC/AlSi10Mg composites fabricated by selective laser melting

Since the aluminum matrix composites prepared by additive manufacturing are prone to defects such as pores and cracks, the properties of the formed composites cannot be further improved. Therefore, the preparation of SiC/AlSi10Mg composites with high modulus and high strength by selective laser melt...

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Published inCeramics international Vol. 50; no. 15; pp. 26607 - 26623
Main Authors Song, Xiang-Yi, Shu, Shi-Li, Zhang, Shuang, Yang, Hong-Yu, Qiu, Feng, Jiang, Qi-Chuan
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.08.2024
Subjects
Microstructure refinement
Selective laser melting
SiC/AlSi10Mg composites
Solidification mechanism
Strengthening mechanism
Selective laser melting
Solidification mechanism
SiC/AlSi10Mg composites
Microstructure refinement
Strengthening mechanism
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Summary:Since the aluminum matrix composites prepared by additive manufacturing are prone to defects such as pores and cracks, the properties of the formed composites cannot be further improved. Therefore, the preparation of SiC/AlSi10Mg composites with high modulus and high strength by selective laser melting technology is of great significance for the wide application of aluminum matrix composites. This work will further investigate the defect formation, microstructure evolution, and solidification mechanism of the composites. The matrix microstructure of the composites can be efficiently refined by adding SiC. In addition, the 5 wt.% SiC/AlSi10Mg composites showed improvements in the tensile yield strength, microhardness, bending strength, elastic modulus, and ultimate tensile strength as compared to the AlSi10Mg alloy. These increases were 21.1 %, 18 %, 8.7 %, 23.2 % and 9.2 % respectively. The strengthening mechanisms at room temperature include fine grain strengthening, thermal mismatch strengthening, solid solution strengthening and precipitation strengthening. It is also mentioned that the primary causes of the decrease in toughness are stress concentration and the existence of the brittle precipitation phase (Al4C3). The increase in high-temperature strength is attributed to the pinning role of SiC and precipitate phases relative to grain boundary and dislocation climbing.
ISSN:0272-8842
DOI:10.1016/j.ceramint.2024.04.388