Effect of Particle and Microstructure on Fatigue Crack Initiation and Growth Behavior of Cu/WCp Composites
ZHANG Yubo1, GUO Rongxin1,2, XIA Haiting1,2, YAN Feng1,2, WANG Shiyue1, LI Yibo1
1 Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500; 2 Yunnan Province University Key Laboratory of Advanced Material Mechanics Behavior and the Micro Structure Design, Kunming University of Science and Technology, Kunming 650500
Abstract: By in-situ scanning electron microscopy, the fatigue crack initiation and propagation behaviors of Cu/WCp compo-sites produced by powder metallurgy was studied, and effects of particle and microstructure on fatigue crack initiation and early pro-pagation mechanism of composites was analyzed. The results show that fatigue micro cracks initiated at the interface between WCp particles and matrix, potential fatigue cracks tend to nucleate and grow along particles. At low stress intensity factor range, the fatigue crack has obvious “abnormal phenomenon” and occupied 71% of the whole life. The early growth of fatigue crack was strongly affected by the local microstructure and WCp particles of composite, and the scattering of small fatigue cracks growth rate was large. As the length of a small crack was more than 150 μm, the crack growth rate increased rapidly until the specimen was quickly broken. Crack deflection, crack branching and the plastic wake decelerated the fatigue crack growth rate, however particle debonding accele-rated the composite fatigue crack growth rate. From the results of numerical simulation, the particle interface debonding of the composite was found to significantly enlarge the fatigue crack growth driving force, which accelerated the fatigue crack growth rate.
1 Sun Chao,Shen Rujuan,Song Min. Simulation of mechanical beha-viors of SiC reinforced Al matrix composites by finite element me-thod[J]. Chinese J Nonferr Met,2012,22(2):476(in Chinese). 孙超, 沈茹娟, 宋旼. 有限元模拟SiC增强Al基复合材料的力学行为[J]. 中国有色金属学报, 2012,22(2):476. 2 Chawla N, Ganesh V V.Fatigue crack growth of SiC particle reinforced metal matrix composites [J]. Int J Fatigue, 2010,32(5):856. 3 Zou Lihua, Fan Jianzhong, Zuo Tao, et al. High-cycle fatigue behavior of 15%SiCp/2009Al composite prepared by powder metallurgy process[J]. Chinese J Nonferr Met, 2010,20(10):1955(in Chinese). 邹利华, 樊建中, 左涛, 等. 粉末冶金15%SiCp/2009Al复合材料的高周疲劳性能[J]. 中国有色金属学报, 2010,20(10):1955. 4 Miller K J. The behaviour of short fatigue cracks and their initiation part Ⅱ—A general summery [J]. Fatigue Fract Eng Mater Struct, 1987,10(2):93. 5 Jordon J B, Bernard J D, Newman Jr J C. Quantifying microstructural small fatigue crack growth in an aluminum alloy using a silicon-rubber replica method [J]. Int J Fatigue, 2012,36(1):206. 6 Kaynak C, Ankara A, Baker T J. A comparison of short and long fatigue crack growth in steel [J]. Int J Fatigue, 1996,18(1):17. 7 Cappelli M D, Carlson R L, Kardomateas G A. The transition between small and long fatigue crack behavior and its relation to microstructure [J]. Int J Fatigue, 2008,30(8):1473. 8 Gall K, Biallas G, Maier H J, et al. Environmentally influenced microstructural small fatigue crack growth in cast magnesium [J]. Mater Sci Eng A, 2005,396(1):143. 9 Mcdowell D L. An engineering model for propagation of small cracks in fatigue [J]. Eng Fract Mech, 1997,56(3):357. 10Zhang Li, Huang Xinyue, Wu Xueren, et al. In-situ experiment on early growth of small fatigue crack of nickel-based super alloy GHD4169 [J]. J Aerospace Power, 2014,29(4):901(in Chinese). 张丽, 黄新跃,吴学仁,等. 镍基高温合金GH4169小裂纹早期扩展的原位疲劳试验[J]. 航空动力学报, 2014,29(4):901. 11Sinha V, Mercer C, Soboyejo W O. An investigation of short and long fatigue crack growth behavior of Ti-6Al-4V [J]. Mater Sci Eng A, 2000,287(1):30. 12Schaf W, Marx M, Knorr A F. Influence of microstructural barriers on small fatigue crack growth in mild steel[J]. Int J Fatigue, 2013,57:86. 13Iqbal A A, Arai Y, Araki W. Effect of hybrid reinforcement on crack initiation and early propagation mechanisms in cast metal matrix composites during low cycle fatigue [J]. Mater Des, 2013,45(3):241. 14Chen Y Q, Pan S P, Zhou M Z, et al. Effects of inclusions, grain boundaries and grain orientations on the fatigue crack initiation and propagation behavior of 2524-T3 Al alloy[J]. Mater Sci Eng A, 2013,580:150. 15中国航空工业总公司.HB7680-2000.中华人民共和国航空工业标准-金属材料高温疲劳裂纹扩展速率试验方法[S].北京:国防科学技术工业委员会,2000. 16Suresh S. 材料的疲劳 [M].王中光,等 (译).北京: 国防工业出版社, 1993. 17Li Hongying, Bin Jie, Lin Wu, et al. Effects of tempering treatment on fatigue crack propagation behavior of micro alloyed pipeline steels[J]. J Central South University: Nat Sci Ed, 2011,42(9):2635(in Chinese). 李红英,宾杰,林武,等. 回火对微合金管线钢疲劳裂纹扩展行为的影响[J]. 中南大学学报:自然科学版, 2011,42(9):2635. 18Wang F F, Xu J M, LI J G, et al. Crack initiation and propagation in A356 alloy reinforced with in situ TiB2 particles [J]. Mater Des, 2012,33:236. 19Suresh S. Fatigue crack deflection and fracture surface contact: Micromechanical models [J]. Metall Mater Trans A, 1985,16(1):249. 20Pavlou D G, Vlachakis N V, Pavlou M G, et al. Estimation of fatigue crack growth retardation due to crack branching[J]. Comput Mater Sci, 2004,29(4):446. 21Anderson T L. Fracture mechanics: Fundamentals and applications [M].New York: Taylor & Francis, 2005. 22Ayyara A, Chawla N. Microstructure-based modeling of crack growth in particle reinforced composites [J]. Compos Sci Technol, 2006,66(13):1980. 23Song Weidong, Wang Jing, Liu Haiyan. Finite element model of real structure for particle reinforced composites [J]. Trans Beijing Institute Technology, 2009,29(6):501(in Chinese). 宋卫东, 王静, 刘海燕. 颗粒增强复合材料真实结构有限元建模[J]. 北京理工大学学报, 2009,29(6):501.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2017, Vol. 31 
