Abstract
? 2022 Elsevier B.V.The dispersion of high content boron nitride nanosheets (BNNSs) in metals to form composites is challenging due to their high specific surface area. Here, Al-based matrix composites with high content of BNNSs were successfully prepared by shift-speed ball milling with step-by-step addition of BNNSs and finally direct current sintering (DCS). Such ball milling method can effectively disperse BNNSs onto the existing Al surface and the fresh Al surface generated by ball milling, allowing for a high content of BNNSs homogeneously dispersed within the composites. Al matrix and BNNSs were tightly bonded and underwent moderate interfacial reactions, forming AlN, AlB2, and AlB10. The effects of BNNSs content on the tensile properties of BNNSs/Al composites were investigated. The ultimate tensile strength of 2.0 vol% BNNSs/Al composites reached 220 MPa, which was 69% higher than that of ball milled pure aluminum. The load was effectively transferred form Al matrix to BNNSs.
NSTL
Elsevier