TiB_2颗粒尺寸和质量分数对原位自生TiB_2/Al复合材料耐磨性能的影响
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摘要
采用原位合成法制备了不同质量分数的TiB_2/Al复合材料,从热力学计算和试验两方面进行分析,得出原位自生法合成的复合材料中仅有TiB_2颗粒且稳定存在。借助激光粒度仪、摩擦磨损试验机、扫描电镜等分析了通过萃取试验获得TiB_2颗粒的粒度以及其对TiB_2/Al复合材料摩擦磨损性能的影响。结果表明,TiB_2颗粒尺寸随TiB_2/Al复合材料中TiB_2含量的增加而增加。随着载荷的增加,相同TiB_2含量复合材料的平均摩擦系数呈现减小的趋势,而磨损量快速增加;相同载荷下,随着TiB_2含量的增加,复合材料的平均摩擦系数和磨损量均先减小后增大。通过对磨损表面形貌分析,发现复合材料在试验条件下的磨损机理由粘着磨损转变为粘着磨损和磨粒磨损。
Different mass fractions of TiB_2/Al composites were fabricated by using in-situ method.The TiB_2 particles were the only particles that existed stably in TiB_2/Al composites by the thermodynamics calculation and experiment analysis.The size of TiB_2 particles was analyzed by laser particle sizer after the particles were extracted from the composties.The friction and wear properties of TiB_2/Al composites were investigated by friction and wear tester,SEM,and so on.The results show that the diameter of TiB_2 particles increases with the increase of TiB_2 content.For the same mass fraction of TiB_2/Al composites,the mean friction coefficient reduces with the increase of the loads,but the wear loss increases rapidly.On the other hand,both the mean friction coefficient and wear loss decrease first and then increase with the increase of mass fraction of TiB_2 particles under the same loads.Subsequently,the worn surface morphology of composites was analyzed,and it is revealed that the wear mechanism is changed from adherence abrasion to both adherence abrasion and abrasive modes during the wear test.
Different mass fractions of TiB_2/Al composites were fabricated by using in-situ method.The TiB_2 particles were the only particles that existed stably in TiB_2/Al composites by the thermodynamics calculation and experiment analysis.The size of TiB_2 particles was analyzed by laser particle sizer after the particles were extracted from the composties.The friction and wear properties of TiB_2/Al composites were investigated by friction and wear tester,SEM,and so on.The results show that the diameter of TiB_2 particles increases with the increase of TiB_2 content.For the same mass fraction of TiB_2/Al composites,the mean friction coefficient reduces with the increase of the loads,but the wear loss increases rapidly.On the other hand,both the mean friction coefficient and wear loss decrease first and then increase with the increase of mass fraction of TiB_2 particles under the same loads.Subsequently,the worn surface morphology of composites was analyzed,and it is revealed that the wear mechanism is changed from adherence abrasion to both adherence abrasion and abrasive modes during the wear test.
引文
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[3]吴瑞瑞,袁铮,李秋书,等.挤压法制备Al2O3/Al铝基复合材料的组织及性能[J].铸造,2017,66(1):29-32.
[4]Mohsen B,Mohammad K,Beshrati G.Fabrication of in situ Cu/Si C composites using multi-pass friction stir processing:Evaluation of microstructural,porosity,mechanical and electrical behavior[J].Composites:Part A,2011,42(10):1445-1453.
[5]Srinivasa R B,Jürgen R,Vikram J.Crack growth resistance(R-curve)behavior and thermo-physical properties of Al2O3particlereinforced Al N/Al matrix composites[J].Composites:Part A,2007,38(3):1038-1050.
[6]丁向东,刘刚,王瑞红,等.颗粒增强金属基复合材料的屈服行为[J].金属学报,2002,38(4):369-375.
[7]Li P T,Yun G L,Yu Y W,et al.Distribution of Ti B2particles and its effect on the mechanical properties of A390 Alloy[J].Materials Science and Engineering,2012,546 A:146-152.
[8]Niranjan K,Lakshminarayanan P R.Dry sliding wear behaviour of in situ Al-Ti B2composites[J].Materials&Design,2013,47:167-173.
[9]Huang W M,Zhou C,Liu B,et al.Improvement in the corrosion resistance of Ti B2/A356 composite by molten-salt electrodeposition and anodization[J].Surface&Coatings Technology,2012,206(23):4988-4991.
[10]Rajesh S,Krishna G A,Raju M,et al.Statistical analysis of dry sliding wear behavior of graphite reinforced aluminum MMCs[J].Procedia Materials Science,2014,6:1110-1120.
[11]Guo Q,Sun D L,Jiang L T,et al.Interfacial structure in Ti B2/Al composite after high speed impact[J].Micron,2012,43(5):688-693.
[12]刘鑫,屈敏,崔岩,等.Ti B2对Ti B2/Al复合材料组织与氢含量的影响[J].金属热处理,2016,41(5):85-89.
[13]王成彪,刘家浚,韦淡平,等.摩擦学材料及表面工程[M].北京:国防工业出版社,2012.
[14]Akbrpour M R,Alipour S.Wear and friction properties of spark plasma sintered Si C/Cu nanocomposites[J].Ceramics International,2017,43:13364-13370.