Abstract
MoSi 2/La 2O 3 and MoSi 2/Y 2O 3 composite particles were prepared by mechanical milling and doped into molybdenum by solid–solid method, respectively. Rods with a diameter of 17 mm were made by pressing and sintering. The effects of different composite particles on microstructures and strength of the as-sintered molybdenum were investigated. Results show that the MoSi 2/La 2O 3 and MoSi 2/Y 2O 3 composite particles transformed to La 2O 3/Mo 5Si 3 and Y 2O 3/Mo 5Si 3 composite particles due to the in situ reaction between Mo and MoSi 2 during sintering process. Mo 5Si 3/La 2O 3 and Mo 5Si 3/Y 2O 3 composite particles can reduce the grain size and improve both strength and toughness of sintered molybdenum significantly. Mo 5Si 3/Y 2O 3 composite particles contribute more to the strength, while the effect of Mo 5Si 3/La 2O 3 on toughness is greater than that of Mo 5Si 3/Y 2O 3.
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