期刊
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
卷 128, 期 1, 页码 -出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-021-05213-1
关键词
Mechanical alloying; Composites materials; Nanocomposites; Microstructure; Mechanical properties
In this study, several nanocomposites were fabricated using mechanical alloying and hot pressing, and the effects of oxide addition on their structure and mechanical properties were investigated. The results showed that the hybrid nanocomposite exhibited higher hardness and compressive strength, along with the formation of specific precipitates.
Mechanical alloying (MA-20 h) and hot pressing (HP-500 MPa, 400 degrees C, 60 min) were used to fabricate AA 7017, AA 7017 + 10 vol.% Al2O3, AA 7017 + 10 vol.% Y2O3, and AA 7017 + (5 vol.% Al2O3 + 5 vol.% Y2O3) nanocomposites. The effects of oxide addition on the microstructure (HR-SEM and HR-TEM), phase evolution (XRD) and mechanical behavior (hardness and compressive strength) were investigated. The microstructure of the samples exhibited grain refinement due to fracturing and severe plastic deformation during MA with homogeneous dispersions. Scherrer's and Williamson-Hall models were analyzed for the structural properties (crystal size, lattice strain and lattice parameter) variation on the powder and hot consolidated samples. The results of the mechanical properties showed that the hybrid nanocomposite exhibited higher hardness (296 +/- 1.87 VHN) and compressive strength (1047.5 +/- 2.96 MPa) along with the formation of MgZn2 and Al2Y precipitates, indicating a supersaturated solid solution. The precipitation and dislocation models play an important role in the strengthening mechanism.
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