论文部分内容阅读
Al 4.95%Zn alloy is directionally solidified in a modified Bridgman apparatus with higher temperature gradient to investigate response of cellular/dendritic microstructures and primary spacing to the variation of growth velocity under near rapid directional solidification condition. The results show that, with increasing growth rate, there exists a transition from dendrite to fine cell and a wide distribution range in primary cellular/dendritic spacing at the given temperature gradient. The maximum, λ max , minimum, λ min , and average primary spacing, λ , as functions of growth velocity, v , can be given by λ max =12 340 v -0.835 3 , λ min =2 953.7 v -0.771 7 , λ =7 820.3 v -0.833 3 , respectively. , as functions of growth velocity, v , can be given by λ max =12 340 v -0.835 3 , λ min =2 953.7 v -0.771 7 , λ =7 820.3 v -0.833 3 , respectively.
Al 4.95% Zn alloy is directionally solidified in a modified Bridgman apparatus with higher temperature gradient to investigate response of cellular / dendritic microstructures and primary spacing to the variation of growth velocity under near rapid directional solidification condition. The results show that, with increasing growth rate , there exists a transition from dendrite to fine cell and a wide distribution range in primary cellular / dendritic spacing at the given temperature gradient. The maximum, λ max, minimum, λ min, and average primary spacing, λ, as functions of growth velocity , v, can be given by λ max = 12 340 v -0.835 3, λ min = 2 953.7 v -0.771 7, λ = 7 820.3 v -0.833 3, respectively., as functions of growth velocity, v, can be given by λ max = 12 340 v -0.835 3, λ min = 2 953.7 v -0.771 7, λ = 7 820.3 v -0.833 3, respectively.