The Pb-17wt% Sb alloy was directionally solidified under two solidification conditions:with different temperature gradients (G=0.93-3.67 K/mm) at a constant growth rate (V=17.50 λm/s) and with different growth rates (V=8.3-497 μm/s) at a constant temperature gradient (G=3.67 K/mm) in a Bridgman furnace.Microstructure parameters,such as primary dendrite arm spacing (λ1),secondary dendrite arm spacing (σ2),and dendrite tip radius (R),were measured.The microhardness (Hv) and ultimate tensile strength (λ) of the directional so-lidification samples were also measured.The influences of solidification and microstructure parameters on Hv and σwere investigated.The results obtained in this work were compared with similar experimental researches in literatures.It is shown that the Hv and σvalues increase with the increase of G and V,but decrease with the increase of λ1,λ2,and R.
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