低碳钢芯奥氏体不锈钢代用焊条的研究  

Influence of Shear Rate on Quality of Semi-solid Magnesium Alloy Slurry

作　　者：李东南[1] 汪先明[1] 戴莉莉[1] 罗吉荣[2] 

机构地区：[1]南昌大学机电工程学院,江西南昌 330029 [2]华中科技大学材料科学与工程学院,湖北武汉 430074

出　　处：《热加工工艺》2005年第8期8-9,12,共3页Hot Working Technology

基　　金：湖北省重点科技计划资助项目（2000P0304）

摘　　要：采用半固态流变压铸成形工艺，研究了高剪切速率双螺杆机械搅拌制浆机中剪切速率对半固态镁合金浆料质量的影响规律。试验表明，在其它工艺参数相同的条件下，随着螺杆剪切速率的增大，半固态浆料的固相率降低，初生α-Mg相晶粒平均尺寸减少，剪切速率高于2730s^-1时，晶粒的圆整度变化不大；剪切速率低于1365s^-1时，组织形态明显恶化。The infuence of shear rate of the twin-screw stirring mixer with high shear rate on the quality of semi-solid magnesium alloy slurry has been studied by rheo-diecasting process,The results show that the solid fraction of the semi-solid slurry and the size of primary α-Mg phase decrease with the increase of the shear rate under the same other processing parameters,The roundness of the crystals change slightly when the shear rate is over 2730s^-1,but the microstructure is distinctly deteriorated when the shear rate is under 1365s^-1。

关 键 词：剪切速率 双螺杆 半固态 镁合金 浆料 

分 类 号：TG146[一般工业技术—材料科学与工程]