摘要
研究了当固／液界面前沿液相中的温度梯度为45K·cm－1，定向凝固Al－59．5mg·g－1Ni的生长速度与组织及共晶间距选择范围的关系．实验表明；随着生长速度增加，A13Ni在Al基体中的形态逐渐由断裂片层状向律状转变.实验发现其共晶间距满足以下关系：λ_(max)~1.85V=101.1μm^2.85s-1;λ_ave^1.93V=46.1μm^2.93s-1;λ_min^1.86V=10.7μm^2.86最小间距与J-H模型所预测的极值间距λ_(max)~1.85V=λ_ext^2V=16.7μm3.
Al-59.sing.g-1 Ni binary alloy has been directionally solidified vertically at various rates with a thermal gradient in front of solid/liquid intedece of 45K.cm-1 to investigate microstructure and eutectic spacing selection. It has been found that morphology of A13Ni phase embedded in Al matrix is gradually transformed from broken lamellar to rodlike with pulling rate increasing. And the relations betWeen pulling rates and maximum, average and minimum spacing are found as follows :λ_(max)~1.85 V = 101.1μm^2.85s-1; λ_ave^1.93V = 46.1μm^2.93s-1; λ_min^1.86V = 10.7μm^2.86s-1, which is close to λ_(max)~1.85 V=λ_ext^2V=16.7μm3.s-1 predicted by J-H model.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
1999年第3期284-288,共5页
Chinese Journal of Materials Research
关键词
定向凝固
共晶间距
铝镍合金
微观组织
directional solidification, Al-Al_3Ni eutectic, eutectic spacing
