Effect of TiO2 particle size on microstructure and refining effect of Al-TiO2-C refiner
LIU Huan1, ZHANG Rui-ying1,2, LI Jin-xuan1, YANG Sen1, YAN Han1
1. School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China;
2. Inner Mongolia Key Laboratory of Light Metal Materials, Inner Mongolia University of Technology, Hohhot 010051, China
Abstract：The Al-TiO2-C refiners were prepared by the in-situ exothermic dispersion method using Al,TiO2 and C powders. The particle sizes of TiO2 were 30,60,90 nm and 200 nm, respectively. The effects of particle size of TiO2 on the refiner microstructure were studied. The refinement effect on industrial pure aluminum was evaluated. The XRD, SEM and EDS techniques were used to characterize the phase composition and the microstructure of Al-TiO2-C refiners. The results show that the Al-TiO2-C refiners compose of Al3Ti,TiC and Al2O3.The particle size of TiO2 directly affects the amount,distribution and morphology of the second phase. When the particle size of TiO2 is 30-90 nm,the amount of Al3Ti and TiC is large. However, the segregation phenomenon is obviously observed. The distribution of particles is not uniform. The Al3Ti is lath-like. When the particle size of TiO2 is 200 nm,the distribution of second phases is uniform and the amount is small. The Al3Ti is blocky. After adding the Al-TiO2-C refiner prepared by 30 nm TiO2, the nucleation temperature of α-Al increases from 659.4 ℃ to 661.8 ℃.Re-heating temperature is dropped from 1.2 ℃ to 0.3 ℃.The minimum average grain size is 633 μm. The refinement effect is the best in this condition.
刘欢, 张瑞英, 李金轩, 杨森, 闫晗. TiO2粒径对Al-TiO2-C细化剂组织及细化效果的影响[J]. 材料工程, 2020, 48(8): 126-133.
LIU Huan, ZHANG Rui-ying, LI Jin-xuan, YANG Sen, YAN Han. Effect of TiO2 particle size on microstructure and refining effect of Al-TiO2-C refiner. Journal of Materials Engineering, 2020, 48(8): 126-133.
 王鹏,张瑞英,韩小伟,等. 不同压制压力制备的Al-TiO2-C细化剂对ZL101合金细化效果的影响[J]. 材料工程,2018, 46(8):84-90. WANG P,ZHANG R Y,HAN X W, et al. Effect of Al-TiO2-C refiners prepared by different compacting pressures on refinement performance of ZL101 alloy[J]. Journal of Materials Engineering,2018,46(8):84-90.
 张国君,武玉英,杨化冰,等. 抗Zr"中毒"Al-Ti-B-C中间合金对7050铝合金力学性能的影响[J]. 材料工程,2017, 45(4):1-8. ZHANG G J,WU Y Y,YANG H B, et al. Influence of anti Zr-poisoning Al-Ti-B-C master alloy on mechanical properties of 7050 aluminum alloy[J]. Journal of Materials Engineering,2017,45(4):1-8.
 LI P T, TIAN W J, WANG D,et al. Grain refining potency of LaB6 on aluminum alloy[J]. Journal of Rare Earths,2012,30(11):1172-1176.
 ZHAO H L, YONG S, MIAO L, et al. Grain refining efficiency and microstructure of Al-Ti-C-RE master alloy[J].Journal of Alloys and Compounds,2010,508(1):206-211.
 FAN Z, WANG Y, ZHANG Y, et al. Grain refining mechanism in the Al/Al-Ti-B system[J].Acta Materialia,2015,84:292-304.
 ZHOU L, GAO F, PENG G S, et al. Effect of potent TiB2 addition levels and impurities on the grain refinement of Al[J].Journal of Alloys and Compounds,2016,689:401-407.
 ZHANG L L, ZHENG Q J, JIANG H X, et al. Interfacial energy between Al melt and TiB2 particles and efficiency of TiB2 particles to nucleate α-Al[J]. Scripta Materialia,2019, 160:25-28.
 肖政兵,邓运来,唐建国,等. Al-Ti-C与Al-Ti-B晶粒细化剂的Zr中毒机理[J].中国有色金属学报,2012, 22(2):371-378. XIAO Z B,DENG Y L,TANG J G,et al. Poisoning mechanism of Zr on grain refiner of Al-Ti-C and Al-Ti-B[J]. The Chinese Journal of Nonferrous Metals,2012,22(2):371-378.
 黄元春,杜志勇,肖政兵,等. Al-Ti-C和Al-Ti-B对7050铝合金微观组织与力学性能的影响[J].材料工程,2015,43(12):75-80. HUANG Y C,DU Z Y,XIAO Z B,et al. Effect of Al-Ti-C and Al-Ti-B on microstructure and mechanical performance of 7050 aluminum alloy[J]. Journal of Materials Engineering,2015,43(12):75-80.
 BIROL Y. Grain refining efficiency of Al-Ti-C alloys[J]. Journal of Alloys and Compounds,2006,422(1):128-131.
 ZHAO B Y, CAI Q Z, LI X W, et al. Effect of TiC nano particles supported by Ti powders on the solidification behavior and microstructure of pure aluminum[J]. Metals and Materials International,2018,24(5):945-954.
 张瑞英,史志铭,李红霞.碳对接触反应法制备TiC-Al2O3p/Al复合材料组织的影响[J].材料热处理学报,2009,30(5):30-34. ZHANG R Y,SHI Z M, LI H X. Effect of carbon on microstructure of TiC-Al2O3p/Al composites prepared by contact reaction technique[J].Transactions of Materials and Heat Treatment,2009,30(5):30-34.
 SETOUDEH N, WELHAM N J. Effect of carbon on mechanically induced self-sustaining reactions (MSR) in TiO2-Al-C mixtures[J].Journal of Refractory Metals and Hard Materials,2016,54:210-215.
 ELMAHALLAWI I, ABDELKADER H, YOUSEF L, et al. Influence of Al2O3 nano-dispersions on microstructure features and mechanical properties of cast and T6 heat-treated Al-Si hypoeutectic alloys[J].Materials Science and Engineering:A,2012,556:76-87.
 CHAO Z L, ZHANG L C, JIANG L T,et al. Design, microstructure and high temperature properties of in-situ Al3Ti and nano-Al2O3 reinforced 2024Al matrix composites from Al-TiO2 system[J]. Journal of Alloys and Compounds,2019,775:290-297.
 ZHU H G,JIANG Y L, YAO Q Q,et al. Reaction pathways, activation energies and mechanical properties of hybrid composites synthesized in-situ from Al-TiO2-C powder mixtures[J]. Materials Chemistry and Physics, 2012,137(2):532-542.
 LIANG Y H,SHI Z M, LI G W,et al. Effects of Er addition on the crystallization characteristic and microstructure of Al-2wt%Fe cast alloy[J]. Journal of Alloys and Compounds,2019,781:235-244.
 FARAHANY S, OURDJINI A, IDRSI M H, et al. Evaluation of the effect of Bi, Sb, Sr and cooling condition on eutectic phases in an Al-Si-Cu alloy(ADC12) by in situ thermal analysis[J]. Thermochimica Acta,2013,559:59-68.
 BIROL Y. Efficiency of binary and ternary alloys from Al-Ti-B system in grain refining aluminum foundry alloys[J]. International Journal of Cast Metals Research,2013, 26(5):283-288.
 BIROL Y. Design of potent grain refiners for wrought aluminum alloys[J].International Journal of Cast Metals Research,2013,26(5):273-278.
 DONG X X, ZHANG Y J, JI S X. Enhancement of mechanical properties in high silicon gravity cast AlSi9Mg alloy refined by Al3Ti3B master alloy[J]. Materials Science and Engineering:A,2017,700:291-300.