不同钛碳比制备的Al-TiO2-C细化剂对ZL101细化变质效果研究  

Refining and Modifying Performance of ZL101 Alloy with Al-TiO2-C Refiners Prepared by Different Titanium Carbon Ratios

作　　者：王鹏[1] 张瑞英[1,2] 刘天丽 杨森 韩小伟[3] Wang Peng;Zhang Ruiying;Liu Tianli;Yang Sen;Han Xiaowei(School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China;Key Laboratory of Light Metal Materials, Hohhot 010051, China;Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China)

机构地区：[1]内蒙古工业大学材料科学与工程学院,内蒙古呼和浩特010051 [2]内蒙古轻合金重点实验室,内蒙古呼和浩特010051 [3]中国科学院金属研究所,辽宁沈阳110016

出　　处：《稀有金属》2018年第7期743-749,共7页Chinese Journal of Rare Metals

基　　金：内蒙古自然科学基金项目(2017MS(LH)0509);内蒙古自治区高等学校科学技术研究基金项目(NJZY16086)资助

摘　　要：以纳米TiO2粉、C粉和Al粉为原料，利用放热弥散法原位合成含有Al3Ti，TiC和Al2O3相的Al-TiO2-C细化剂，钛和碳的摩尔比分别为1：1，3：1，5：1，8：1，10：1和15：1，研究不同钛碳比制备的细化剂对ZL101合金细化变质效果的影响。利用x射线衍射仪（XRD）、扫描电镜（SEM）及能谱仪（EDS）研究钛碳比对Al-TiO2-C细化剂相组成和显微组织的影响。将制备好的Al-TiO2-C细化剂加入到ZLl01合金中进行细化变质实验，利用MATLAB软件提取冷却曲线的特征值评价细化变质效果。结果表明：钛碳比为10：1时，Al-TiO2-C细化剂组织中A13Ti呈圆块状且数量最多，尺寸均匀，TiC颗粒和Al2O3颗粒在晶界弥散分布，取质量分数为0．3％的此种组织的细化剂细化变质ZL101合金后，初晶最低过冷温度Tmin=586．8℃，初晶再辉温度△T1=0．4℃均达到最小，证明细化效果最好，细化后平均晶粒尺寸为71．6μm；变质前后共晶生长温度之差△TE=14．4℃达到最大，变质效果理想。因此，钛碳比为10：1时制备的细化剂对ZL101合金具有最好的细化变质效果。The Al-TiO2-C refiners were synthesized with in-situ exothermic dispersion method using nanometer TiO2 , C and Al powders as raw materials. The refiners were fabricated with different titanium carbon ratios, and the molar ratio of titanium to carbon was 1： 1, 3： 1, 5： 1, 8： 1, 10： 1, 15： 1, respectively. Effect of Al-TiO2-C refiners prepared by different titanium carbon ratio on refining and modifying performance of ZL101 alloy was studied. The effects of titanium carbon ratio on the phase composition and microstructure of Al-TiO2-C refiners were investigated using X-ray diffraction （ XRD）, scanning electron microscope （SEM） and energy dispersive spectroscope （EDS） analysis. The Al-TiO2-C refiner was added to the ZL101 alloy for refinement and modification experiment. MATLAB software was used to extract the characteristic values to evaluate the refinement and modification effect of Al-TiO2-C refiners on ZL101 alloy. The results showed that the optimal titanium carbon ratio was 10： 1, Al3Ti was round block with uniform size and possessed the largest particle contents, furthermore, TiC particles and Al2O3 particles dispersion distributed in grain boundary. When the addition amount was 0.3% （mass fraction）, the characteristic value Tmin was 586. 8℃ , △T1 was 0.4℃, which both reached the minimum value, the Al-TiO2-C refiners possessed good refinement effect, and the average grain diameter of the ZL101 alloy was 71.6 p,m; △TE was 14.4 %, which reached the maximum value. This refiners possessed ideal modification effect. Therefore, it had the best refinement and modification performance on ZL101 alloy.

关 键 词：Al-TiO2-C细化剂 钛碳比 ZL101合金 特征值 

分 类 号：TB331[一般工业技术—材料科学与工程]