Microstructural and basic mechanical characteristics of ZA27 alloy-based nanocomposites synthesized by mechanical milling and compocasting

Journal Article · Mon Jul 01 04:00:00 EDT 2019 · Journal of Composite Materials

DOI:https://doi.org/10.1177/0021998318817876· OSTI ID:22946916

Bobić, Biljana M.; Vencl, Aleksandar; Ružić, Jovana; Bobić, Ilija; Damnjanović, Zvonko

Particulate nanocomposites with the base of ZA27 alloy were synthesized using an innovative route, which includes mechanical milling and compocasting. Scrap from the matrix alloy and ceramic nanoreinforcements were mechanically milled using the ball-milling technique, which led to the formation of composite microparticles. The use of these particles in the compocasting process provided better wettability of ceramic nanoreinforcements in the semi-solid metal matrix, which resulted in a relatively good dispersion of the nanoreinforcements in nanocomposite castings. The presence of nanoreinforcements led to the grain refinement in the matrix of nanocomposites. The mechanical properties of the synthesized nanocomposites are improved and compared with the properties of the metal matrix. The observed increase in the hardness of nanocomposites with Al2O3 nanoreinforcements (20–30 nm) was 6.5% to 10.8%, while the yield strength of these nanocomposites has increased by 12.2% to 23.2%. The hardness and compressive yield strength of the nanocomposites with Al2O3 nanoparticles (100 nm) increased by 1.7% to 8.0% and 2.3% to 8.3%, respectively. The increase in hardness of the nanocomposites with SiC nanoparticles (50 nm) was 11.5% to 20.6%, while the increase in the yield strength was 15.6% to 24.5%. The greatest contribution to the overall strengthening in the synthesized nanocomposites is the result of increased dislocation density due to the difference in coefficients of thermal expansion for the matrix alloy and nanoreinforcements. © The Author(s) 2018.

• OSTI ID: 22946916
• Journal Information: Journal of Composite Materials, Journal Name: Journal of Composite Materials Journal Issue: 15 Vol. 53; ISSN 0021-9983
• Country of Publication: United States
• Language: English

Related Subjects

60 APPLIED LIFE SCIENCES
77 NANOSCIENCE AND NANOTECHNOLOGY
ALLOYS
GRAIN REFINEMENT
HARDNESS
MATRICES
MILLING
NANOCOMPOSITES
NANOPARTICLES
SILICON CARBIDES
SYNTHESIS
THERMAL EXPANSION
YIELD STRENGTH