Abstract
The in-situ (TiB2+Mg2Si)/Al composite is successfully fabricated by the combination of salt-metal reaction route and ingot metallurgy. The presence of Mg2Si phase solves the problem that the particulate volume fraction of TiB2/Al composite processed by salt-metal reaction route is low. X-ray diffraction confirms the formation of TiB2 and Mg2Si phases, no other intermediate phases are traced. TiB2 and Mg2Si particles are relative uniformly distributed in the matrix. TiB2 particles are sub-micron in size, and Mg2Si phase is refined from Chinese script morphology to short dispersed sticks by TiB2 particles. The refined Mg2Si phase are under 10 μm in size and the whole reinforcements volume fraction is about 14∼15%. The grains are effectively refined. The mechanism of mutual refinement between TiB2 particles and Mg2Si phase is discussed. The yield stress and ultimate tensile strength of TiB2+Mg2Si/Al composite are improved by 244% and 229% compared with Al matrix, respectively.
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