Experimental investigation of hardness and impact toughness of in suit Ag-rich binder phase formation with h-BN/CuSn10 metal matrix composite

摘要

In order to improve the impact toughness of h-BN/CuSn10 composites, and to realize their industrial application in urban rail transit, we prepared Ag/h-BN/CuSn10 composites containing 3 wt% Ag using a powder metallurgy process. The microstructure of the composite was characterized by scanning electron microscopy, electron probe microanalysis, and energy dispersive spectroscopy. The transformation of the Ag-rich phase was recorded using confocal microscopy. The experimental results show that the Ag-rich binder phase, formed during the sintering process, promoted the dissolution and rearrangement of matrix particles, simultaneously filling the matrix pores. Thus, the continuity of the matrix was effectively improved, and the porosity of the composite material was significantly reduced. Compared with the original pristine composite, the relative density of the Ag/h-BN/CuSn10 composite increased from 86 to 93%, and the impact toughness significantly increased from 2.9 to 8.4 J/cm(2), a 189% improvement. (C) 2020 Elsevier B.V. All rights reserved.