| The effects of alloying elements on the solid solution hardening of molybdenum were investigated at 293-1073˚K. Specimens were prepared by are melting with 0.2 wt% Sc as a oxygen-scavenger and alloy additions were up to 1.5 wt% for V, Nb, Ti and 0.5 wt% for Zr. Vickers hardness was chosen as the measure of solution hardening. The results obtained were as following; 1. Atomic size difference between molybdenum and alloying element contributed significantly to the solution hardening. 2. Solution hardening, △H, was decreased with rising temperature, while solution hardening ratio, △H/H(Mo), increased with rising temperature. 3. The order of hardening effect was Zr$gt;Ti$gt;Nb$gt;V, however, at the higher temperature from 873˚K, the effect would be some what reversed such that the effect of V was larger than that of Ti and Nb. |
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