期刊
MATERIALS CHARACTERIZATION
卷 123, 期 -, 页码 173-177出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2016.11.028
关键词
Mechanical alloying; Al-Zr; X-ray diffraction; Transmission electron microscopy; Hardness; Compression tests
类别
资金
- Ministry of Education and Science of the Russian Federation of NUST MISiS [211, K1-2015-026]
- Ministry of Education and Science of the Russian Federation State Assignment to the Universities of the Russian Federation [11.1760.2014/K]
Ground chips of as-cast Al-10 wt.% Zr alloy were subjected to mechanical alloying (MA) with 5 vol.% of nanodiamond addition in a high energy planetary ball-mill. The aim of this work was to investigate the microstructure, phase transformation and mechanical properties of the material both after MA and after subsequent annealing. Optical and transmission electron microscopes were used for morphological and microstructural analysis. The effect of milling time on powder microhardness, Al lattice parameter, lattice microstrain and crystallite size was determined. It was shown that mechanical alloying of as-cast Al-10wt%Zr alloy during 20 h leads to a complete dissolution of the primary tetragonal Al3Zr crystals in aluminum. At the same time, the powder micro hardness increases to 370 HV. Metastable cubic Al3Zr phase nanoparticles precipitate from the Al solution due to its decomposition after annealing, however, the Al solid solution remains supersaturated and nanocrystalline. Compression tests at room temperature and at 300 degrees C showed that the strength values of the hot-pressed samples reach 822 MPa and 344 MPa, respectively. (C) 2016 Elsevier Inc. All rights reserved.
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