Al-TiO<sub>2</sub>-C晶粒细化剂对工业纯铝细化效果的影响

doi:10.11868/j.issn.1001-4381.2015.000521

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摘要

以TiO₂粉、C粉、Al粉为原料，利用放热弥散法制备Al-TiO₂-C晶粒细化剂，采用XRD，SEM，EDS等研究不同C与TiO₂比例的细化剂的显微组织，并对工业纯铝进行细化实验。结果表明：Al-TiO₂-C晶粒细化剂析出相为Al₃Ti，TiC和Al₂O₃。当C与TiO₂摩尔比为1:25~1:20时，Al-TiO₂-C细化剂组织中Al₂O₃颗粒数量适中且分布相对弥散。当C与TiO₂摩尔比为1:20，该细化剂添加量为0.2%（质量分数）时，可将工业纯铝细化到约142μm，且保温1h未出现细化衰退。

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	韩小伟
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关键词 ：放热弥散法, Al-TiO₂-C细化剂, 晶粒细化

Abstract：

The Al-TiO₂-C grain refiners were synthesized by the in-situ exothermic dispersion method by using TiO₂, C and Al powders as raw materials. The microstructure of Al-TiO₂-C refiners with different C/TiO₂ was investigated by SEM, XRD and EDS. Grain refining test was carried out on industrial pure aluminum. The results show that Al-TiO₂-C refiners are composed of Al₃Ti, TiC and Al₂O₃. When the mole ratio of C to TiO₂ is between 1:25 and 1:20, the amount of Al₂O₃ is moderate and its distribution is relatively dispersive. An excellent grain refining performance is obtained when adding 0.2% (mass fraction) Al-TiO₂-C refiner with C/TiO₂ is 1:20, the average grain size is about 142μm and there is no refining recession when holding 1h.

Key words： exothermic dispersion method Al-TiO₂-C refiner grain refinement

收稿日期: 2015-04-29 出版日期: 2017-10-18

中图分类号:

TB331

基金资助:内蒙古自治区自然科学基金项目(2017MS（LH）0509);内蒙古自治区高等学校科学研究基金项目(NJZZ14056)

通讯作者: 张瑞英 E-mail: zhang_ruiying@126.com

作者简介: 张瑞英(1972-), 女, 副教授, 研究方向:铝合金及金属基复合材料, 联系地址:内蒙古自治区呼和浩特市爱民街49号内蒙古工业大学材料学院(010051), E-mail:zhang_ruiying@126.com

引用本文:

韩小伟, 张瑞英, 王鹏. Al-TiO₂-C晶粒细化剂对工业纯铝细化效果的影响[J]. 材料工程, 2017, 45(10): 65-70.
Xiao-wei HAN, Rui-ying ZHANG, Peng WANG. Effect of Al-TiO₂-C Grain Refiners on Refinement of Industrial Pure Aluminum. Journal of Materials Engineering, 2017, 45(10): 65-70.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.000521 或 http://jme.biam.ac.cn/CN/Y2017/V45/I10/65

Fig.1 不同C与TiO₂摩尔比细化剂微观组织
(a)0;(b)1:30;(c)1:25;(d)1:20;(e)1:15;(f)1:10

Fig.2 圆块状颗粒相能谱分析

Fig.3 不同C与TiO₂摩尔比细化剂的XRD图谱
(a)0;(b)1:30;(c)1:25;(d)1:20;(e)1:15;(f)1:10

Fig.4 不同C与TiO₂摩尔比细化剂的细化效果图
(a)未添加细化剂; (b)0;(c)1:30;(d)1:25;(e)1:20;(f)1:15;(g)1:10

Fig.5 平均晶粒尺寸随C与TiO₂比例分布图

Fig.6 不同保温时间下细化剂的细化效果图
a)Al-TiO₂-C; (b)Al-5Ti-B; (1)5min; (2)10min; (3)30min; (4)1h

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