Abstract
In present work, the effects of in situ (ZrB2+TiB2) particles and rare earth element Er on microstructure and mechanical properties of 6082Al matrix composites were investigated respectively. On the basis of research above, the characteristics of synergistic enhancement of them can be analyzed. The results indicated that the mechanical properties of 6082Al-3wt%(TiB2+ZrB2)-0.5 wt%Er composites reached to the maximum values with YS, UTS and elongation were 285 MPa, 330 MPa and 11.7% respectively, which increased by 13.1%, 13.8% and 85.8% respectively compared with the 6082Al matrix alloy. The addition of Er to the 6082Al-(TiB2+ZrB2) composites contributed to the notable modification on distribution and morphology of in situ particles that the large particle clusters almost disappeared and the size of TiB2 and ZrB2 particles decreased a lot compared with the situation without Er addition. The grain size of the matrix alloy decreased from 115.4 μm to 43.8 μm when the Er addition is 0.5 wt%. The Er-containing precipitates and in situ TiB2 and ZrB2 particles were confirmed by Optical microscope, Scanning electron microscopy, Transmission electron microscopy, Energy dispersive spectroscopy, and X-ray diffraction.
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