不同压制压力制备的Al-TiO_2-C细化剂对ZL101合金细化效果的影响

Effects of Al-TiO_2-C Refiners Prepared by Different Compacting Pressures on Refinement Performance of ZL101 Alloy

以Al粉、TiO_2粉、C粉和稀土La_2O_3粉为原料,利用放热弥散法原位合成稀土La_2O_3质量分数为0.3%的AlTiO_2-C晶粒细化剂,压制压力分别为80,85,88,90kN和92kN,研究不同压力制备的细化剂对ZL101合金细化效果的影响。采用X射线衍射仪、扫描电镜及能谱仪研究压制压力对Al-TiO_2-C细化剂相组成和显微组织的影响。利用MATLAB软件提取特征值评价Al-TiO_2-C细化剂对ZL101合金的细化能力。结果表明:压制压力为90kN时,Al-TiO_2-C细化剂组织中Al_3Ti呈圆块状数量明显增多,尺寸均匀,形核颗粒TiC和Al_2O_3数量有所增多,此种组织的细化剂对ZL101合金具有最好的细化效果。

The Al-TiO2-C grain refiners with the mass fraction of 0.3% La2O3 were synthesized by the exothermic dispersion method using Al,TiO2,C,and La2O3 powders as raw materials,The refiners were fabricated by different compacting pressures,including 80,85,88,90 kN and 92 kN respectively.Effect of Al-TiO2-C refiners prepared by different compacting pressures on refinement performance of ZL101 alloy was studied.The effects of compacting pressures on the phase morphology and microstructure of Al-TiO2-C refiners were investigated by using XRD,SEM and EDS analysis.The refinement capability of Al-TiO2-C refiners on ZL101 alloy was evaluated by using extracting characteristic values from thermal analysis cooling curves of ZL101 alloy,which comes from MATLAB software.The results show that the optimal compacting pressure is 90 kN,Al3 Ti exhibiting round block obviously increases and the size is uniformly distributed in the microstructure of refiners;moreover,the number of nucleation particles TiC as well as Al2O3 is increased.Al-TiO2-C has the best refinement performance on ZL101 alloy.