摘要
The high cycle fatigue properties and fracture behavior of 2124-T851 aluminum alloy were investigated roundly,including the fatigue crack growth rate,fracture toughness and fatigue S-N curve. Furthermore,the fatigue crack growth rate was analyzed by fitting the curves. And the microstructure of the alloy was studied using by optical microscopy,transmission electron microscopy and X-ray diffractometry,scanning electron microscopy. The results show that the fatigue strength and the fracture toughness of 2124-T851 thick plate are 243 MPa and 29.6 MPa·m1/2 at room temperature and R=0.1,respectively. At high cycle fatigue condition,the characteristics of fatigue facture were observed obviously. And the higher the stress amplitude,the wider the space between the fatigue striations,the faster the rate of fatigue crack developing and going into the intermittent fracture area and the greater the ratio between the intermittent fracture area and the whole fracture area.
The high cycle fatigue properties and fracture behavior of 2124-T851 aluminum alloy were investigated roundly, including the fatigue crack growth rate, fracture toughness and fatigue S--N curve. Furthermore, the fatigue crack growth rate was analyzed by fitting the curves. And the microstructure of the alloy was studied using by optical microscopy, transmission electron microscopy and X-ray diffractometry, scanning electron microscop1/2 The results show that the fatigue strength and the fracture toughness of 2124-T851 thick plate are 243 MPa and 29.6 MPa.m at room temperature and R=0. 1, respectively. At high cycle fatigue condition, the characteristics of fatigue facture were observed obviously. And the higher the stress amplitude, the wider the space between the fatigue striations, the faster the rate of fatigue crack developing and going into the intermittent fracture area and the greater the ratio between the intermittent fracture area and the whole fracture area.
出处
《中国有色金属学会会刊：英文版》
CSCD
2007年第A01期295-299,共5页
Transactions of Nonferrous Metals Society of China
基金
Project (2005CB623705) supported by the National Basic Research Program of China
关键词
疲劳强度
破裂强度
压力
金属材料
fatigue strength
fracture toughness
fatigue fractograph
2124 aluminum alloy
