Abstract：The effect of rare earth element Ce, Sc and Er on TiB2 particles and matrix alloy micros-tructure of TiB2/Al composites was studied with in situ synthesis method. It shows that the addition of rare earth element improves the microstructure and properties of TiB2/Al composites notably. The particles of TiB2 are relatively homogenously distributed as adding 0.3% (mass fraction) rare earth element Sc and Er, moreover, it is Er that refines the microstructure of matrix alloy most significantly, then is Sc. Similarly, it is demonstrated that the addition of Sc and Er results in better tensile strength, which is enhanced by 32% and 31%, respectively; the addition of Er also leads to the best ductility by 85% with optimal tensile property. Meanwhile, fracture morphology analysis reveals that the fracture of the composites is microporous gathered ductile fracture when adding Sc and Er. Finally, it is verified that the mechanism of rare earth element on composites lies in two aspects:one is that the addition of rare earth element improves the wettability of the composites and suppresses the agglomeration of TiB2 particles; the other is that the addition of rare earth element refines the microstructure of matrix alloy and then improves the tensile strength of the composites.
屈敏, 刘鑫, 崔岩, 刘峰斌, 焦志伟, 刘园. 稀土元素对原位合成TiB2/Al复合材料组织和性能的影响[J]. 材料工程, 2018, 46(3): 98-104.
QU Min, LIU Xin, CUI Yan, LIU Feng-bin, JIAO Zhi-wei, LIU Yuan. Effect of Rare Earth Element on Microstructure and Properties of in situ Synthesized TiB2/Al Composites. Journal of Materials Engineering, 2018, 46(3): 98-104.
 TSUKAMOTO H. A mean-field micromechanical model of thermal ratcheting behavior in short fiber-reinforced metal matrix composites[J]. Acta Mater, 2012, 60:3709-3717.
 XUAN Q Q, SHU S L, QIU F, et al. Different strain-rate dependent compressive properties and work-hardening capacities of 50vol% TiCx/Al and TiB2/Al composites[J]. Mater Sci Eng:A, 2012, 529:335-339.
 王常川, 王日初, 彭超群,等. 金属基固体自润滑复合材料的研究进展[J].中国有色金属学报, 2012, 7(22):1945-1952. WANG C C,WANG R C,PENG C Q, et al. Research progress of metallic solid selflubricating composites[J]. Chi J Nonf Metals, 2012, 7(22):1945-1952.
 DAS B, ROY S, RAI R N, et al. Application of grey fuzzy logic for the optimization of CNC milling parameters for Al-4.5%Cu-TiC MMCs with multi-performance characteristics[J]. Eng Sci Tech, 2016, 19(2):857-865.
 杨朋军,李良,雷志强,等. SiC/Al铝基复合材料在惯性器件上的应用研究[J]. 导航定位与授时, 2016, 3:63-66. YANG P J, LI L, LEI Z Q, et al. Research on the application of SiC/Al composite material on inertial device[J].Navig Posit Timi, 2016, 3:63-66.
 PARAMSOTHYA M, NGUYENA Q B, TUNA K S, et al. Mechanical property retention in remelted microparticle to nanoparticle AZ31/Al2O3 composites[J]. J Alloys Comp, 2010, 506:600-606.
 BHARATH V, NAGARAL M, AURADI V, et al. Preparation of 6061Al-Al2O3 MMC's by stir casting and evaluation of mechanical and wear properties[J]. Pro Mater Sci, 2014, 6:1658-1667.
 SINGH R, DUREJA J S, FARINA I, et al. Investigations for dimensional accuracy of Al alloy/Al-MMC developed by combining stir casting and ABS replica based investment casting[J]. Comp Part B:Eng, 2017,115:203-208.
 RAJESH S, KRISHNA A, RAJU P. R, et al. Statistical analysis of dry sliding wear behavior of graphite reinforced aluminum MMCs[J]. Pro Mater Sci, 2014, 6:1110-1120.
 EKICIA R, APALAK M K, YILDIRIM M, et al. Effects of random particle dispersion and size on the indentation behavior of SiC particle reinforced metal matrix composites[J]. Mater Design, 2010, 31:2818-2833.
 OCANDO C, TERCJAK A, MONDRAGON I. Nanostructured systems based on SPS epoxidized triblock copolymers and well-dispersed alumina/epoxy matrix composites[J]. Comp Sci Tech, 2013, 70(7):1106-1112.
 MONJE I E, LOUIS E, MOLINA J M. Aluminum/diamond composites:a preparative metho-d to characterize reactivity and selectivity at the interface[J]. Script Mater, 2012, 68:562-567.
 ILO S, JUST C, BADISCH E, et al. Effects of interface formation kinetics on the microstructural properties of wear-resistant metal matrix composites[J]. Mater Sci Eng:A, 2013, 530:6378-6385.
 李苏,李俊寿,赵芳,等. TiB2材料的研究现状[J]. 材料导报,2013, 27(3):34-38. LI S, LI J T, ZHAO F, et al. Advance in research of TiB2 materials[J]. Materials Review, 2013, 27(3):34-38.
 SURESH S, SHENBAGA N, MOORTHI V. Aluminium-titanium diboride (Al-TiB2) metal matrix composites:challenges and opportunities[J]. Pro Eng, 2012, 38(1):89-97.
 NIRANJAN K, LAKSHMINARAYANAN P R. Dry sliding wear behavior of in situ Al-TiB2 composites[J]. Mater Design, 2013, 47(9):167-173.
 钟群鹏.断口学[M].北京:高等教育出版社, 2006:144-147. ZHONG Q P. Fractography[M].Beijing:Higher Education Press, 2006:144-147.
 崔忠圻,刘北兴. 金属学与热处理原理[M].哈尔滨:哈尔滨工业大学出版社, 2007:159-160. CUI Z Q, LIU B X. Metallurgy and heat treatment theory[M]. Harbin:Harbin Institute of Technology Press, 2007:159-160.