1 School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China 2 School of Technology, Beijing Forestry University, Beijing 100083, China 3 Metal & Chemistry Research Institute, China Academic of Railway Sciences, Beijing 100081, China
In order to study the influence of the service temperature load and material microstructure on the thermal fatigue crack growth behavior of SiCp/A356 composites, and to clarify the microscopic mechanism of thermal fatigue crack growth, the thermal fatigue crack growth test of SiCp/A356 composites was carried out. The results show that the crack growth process includes the slow growth stage caused by the deflection of SiC particles and the release of the driving force of the secondary crack growth, and the rapid growth stage where the main crack is connected with the micro-damage front end of the crack growth. When the heating temperature is low, the "step-like" feature of crack growth is obvious, the overall growth rate is slower, and the crack width is smaller, the crack propagation methods are particle fracture, light-mass matrix tearing and cracking along the interface. When the heating temperature is higher, the "oblique straight-line jump" stage is more obvious, the crack width is large and the growth rate is high, the crack growth is dominated by particle shedding and large-scale matrix tearing. Main crack always propagates forward with less resistance by choosing to follow the SiC particle group or directly pass through the α-Al matrix, when Si phase is loaded, it is easy to fracture and become the source of crack propagation. At the same time, the micro-damage at the front end of the crack propagation has a guiding effect on the crack propagation.
YANG Z Y. Research on thermal damage and structure design of aluminum matrix composites brake disc for high-speed train[D]. Beijing: Beijing Jiaotong University, 2008.
TENG J. Preparation technology, friction and wear properties and mechanisms of aluminum matrix composite brake rotor and coupled pad used for high-speed train[D]. Changsha: Hunan University, 2006.
QI H B , DING Z L , FAN Y C , et al. Research on automotive brake discs of SiCp/Al composite[J]. Acta Materiae Compositae Sinica, 2001, 18 (1): 62- 66.
4
陈春峰. 铝基复合材料制动盘的设计及制造研究[D]. 北京: 北京交通大学, 2007.
4
CHEN C F. Research on design and manufacturing of aluminum matrix composite brake discs[D]. Beijing: Beijing Jiaotong University, 2007.
ZEUNER T , ZHANG Y . Brake disc made of composite materials used in high-speed train[J]. Foreign Locomotive & Rolling Stock Technology, 1999, (2): 19- 21.
LI W , AN S P , YANG L , et al. Effect of SiC particle size on high temperature fatigue properties of spray-deposited Al-Si composites[J]. Transactions of Materials and Heat Treatment, 2021, 42 (1): 34- 43.
7
LI W , CHEN H T , ZUO L , et al. Thermomechanical fatigue behavior of spray-deposited SiCp/Al-Si composite applied in the high-speed railway brake disc[J]. International Journal of Photoenergy, 2020, (1): 1- 11.
8
AYYAR A , CHAWLA N . Microstructure-based modeling of crack growth in particle reinforced composites[J]. Composites Science and Technology, 2006, 66 (13): 1980- 1994.
doi: 10.1016/j.compscitech.2006.01.007
ZHANG J Q , ZHOU S X , YANG Y , et al. Research on the thermal fatigue behaviors of the composites material SiCp/A356 used on the high-speed train[J]. Engineering Mechanics, 2011, 28 (8): 252- 256.
10
TEVATIA A , SRIVASTAVA S K . Influence of residual thermal stresses on fatigue crack growth life of discontinuous reinforcements in metal matrix composites[J]. Fatigue & Fracture of Engineering Materials & Structures, 2017, 40 (1): 81- 88.
LIU F C , XIONG Q P , LIU Q , et al. Fatigue property of carbon nanotubes reinforced 7075 Al alloy composite prepared by friction stir processing[J]. Rare Metal Materials and Engineering, 2015, 44 (7): 1786- 1790.
12
LUO Y , WU S C , HU Y N , et al. Cracking evolution behaviors of lightweight materials based on in situ synchrotron X-ray tomography: a review[J]. Frontiers of Mechanical Engineering, 2018, 13 (4): 461- 481.
YAN X Y , WANG S R , WEN D S , et al. Effects of HfC particles on crack initiation and propagation behavior of WC/Co compo-sites[J]. Journal of Northwestern Polytechnical University, 2019, 37 (3): 628- 635.
14
CHEN Z , PING H , CHEN L . The role of particles in fatigue crack propagation of aluminum matrix composites and casting aluminum alloys[J]. Journal of Materials Science & Technology, 2007, 23 (2): 213- 216.
15
QIAN L , TODA H , MORITA S , et al. In-situ observations of fracture processes in 0.6μm and 9.5μm SiCP/6061Al compo-sites[J]. Materials Transactions, 2005, 46 (1): 34- 41.
16
潘利科. 铝基复合材料摩擦制动服役特性及失效机制研究[D]. 北京: 北京交通大学, 2017.
16
PAN L K. Research on friction brake behavior and failure mecha-nism of aluminum matrix composite[D]. Beijing: Beijing Jiaotong University, 2017.
17
李翔. SiCp/A356复合材料裂纹扩展机理研究[D]. 北京: 北京交通大学, 2018.
17
LI X. Research on crack growth mechanism of SiCp/A356 composites[D]. Beijing: Beijing Jiaotong University, 2018.
18
ZHANG X X , XIAO B L , ANDRÄ H , et al. Multiscale modeling of macroscopic and microscopic residual stresses in metal matrix composites using 3D realistic digital microstructure models[J]. Composite Structures, 2016, 137, 18- 32.
19
SURESH S , SHENBAG N , MOORTHI V . Aluminium-titanium diboride (Al-TiB2)metal matrix composites: challenges and oppor-tunities[J]. Procedia Engineering, 2012, 38, 89- 97.
FAN Y W . Research progress on micro-damage behavior of me-tal matrix composites[J]. Transactions of Materials and Heat Treatment, 2020, 41 (10): 1- 23.
ZHANG J Y , ZOU J , ZHOU X L , et al. Effect of particle on thermal residual stress in aluminum matrix composite[J]. Transactions of Materials and Heat Treatment, 2009, 30 (1): 197- 200.
KONG Y R , GUO Q , ZHANG D . Review on interfacial properties of particle-reinforced aluminum matrix composites[J]. Materials Review, 2015, 29 (9): 34- 43.
YANG Y. Research on thermal fatigue evalution method of SiCp/A356 composite brake disc for high-speed train[D]. Beijing: Beijing Jiaotong University, 2009.
YANG Y , XIE J L . The test research of thermal fatigue crack initiation and propagation of SiCp/A356 for brake discs of high-speed trains[J]. Journal of the China Railway Society, 2007, (5): 43- 47.
LIAO L , LAI D . Study of fatigue growth mechanism of an aluminum alloy A356-SiCp composits[J]. Journal of Wuhan University of Technology, 1997, (2): 24- 28.
2022, Vol. 50 
), 臧家俊1, 方丹琳2, 李翔3, 李志强1, 李卫京1
