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FATIGUE CRACK PROPAGATION IN Al-Li ALLOY 8090

Acta Metallurgica Sinica(English Letters) 1992年第6期5卷 436-442页

作者： WANG Zhongguang ZHANG Yun HU Zhuangqi State Key Laboratory for Fatigue and Fracture of Materials,Institute of Metal Research,Academia Sinica,Shenyang,ChinaHE Shiyu LI Qingjian Harbin Institute of Technology,Harbin,China Professor Institute of Metal Research Academia SinicaShenyang 110015China

Fatigue crack growth rates of Al-Li alloy 8090 in air were found to be strongly dependent up- on the aging *** naturally aged and underaged specimens showed the highest re- sistance to the fatigue crack *** fatigue crack growth resistance of the overaged specimen is the lowest and that of the peakaged specimen in *** compared to air, 3.5% NaCl solution does not change the effect of aging conditions on the fatigue crack growth,but causes a decrease of the resistance to the fatigue crack growth under the same ag- ing *** short cracks from notch and physically short cracks showed much higher rates of fatigue crack propagation in comparison with long cracks under the same aging condi- tion and stress intensity *** growth behavior of the short crack depends on its *** growth rate of short crack from notch decreases first to a minimum and then increases with in- creasing △***,the physically short crack grows at a progressively increasing rate. The effects of aging conditions are explained in terms of the slip planarity of dislocations and the cyclic slip *** observed short crack behavior is considered to be dependent on the crack closure and the local plasticity near the crack tip.

关键词： Al-Li alloy fatigue crack closure effect slip planarity

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Physical　Essence　of　Long　Fatigue　Crack　Growth　Behavior　for　Aluminum－lithium　Alloy

引用

Rare Metals 1995年第2期14卷 110-117页

作者：陈铮倪永峰西北工业大学材料科学与工程系陕西西安

The growth behavior of fatigue cracks for alurninum-lithium alloy 2090 and traditional aluminum alloy2024 was investisated. Specific einphasis was placed on explorins the correlation among crack closure effect,intrinsic growth resistance and fractographic features. A comparing to alloy 7075 , alloy 2090 shows the excel-lent nominal growth resistance of fatigue cracks, inferior intrinsic growth resistance in the near-threshold zoneand superior one in the Ⅲ zone. The mechanism of extrinsic toughness effect in the near-threshold zone iscrack closure effect. The excellect norninal and intrinsic growth resistance of fatigue cracks in the Ⅲ zone is at-tributed to the delamination toughness effect. A certain level of crack closure effect and the near-delaminationtoughness effect ean be achieved in the Paris zone.

关键词： Aluminum-lithium alloy Fatigue crack closure effect Fracto-graphic feature

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CORROSION FATIGUE OF HSLA STEELS IN SALT SPRAY

引用

Acta Metallurgica Sinica(English Letters) 1989年第10期2卷 293-296页

作者： HAO Hongqi SONG Yujiu Xi’an Jiaotong University,Xi’an,China Institute of Metallic Materials and Strength,Xi’an Jiaotong University,Xi’an,China

The corrosion fatigue propagation behaviour of high strength low alloy Cr-Ni and Si-Mn steels has been investigated in 3.5 %NaCl solution spryly at the frequencies of 0.1 and 5.5 Hz. It was shown that the fatigue crack initiation resistances of the two steels are significantly re- duced in salt spray;the fatigue crack growth rates of steels increase with the decrease of fre- quency and are much higher in salt spray than in air within low ΔK range.A critical stress in- tensity factor was observed for each steel and the crack growth stoppage will occur if the ΔK values are lower than *** was found that the active dissolution makes great contribution to the fatigue crack growth within low ΔK range.

关键词： salt spray initiation period crack growth stoppage closure effect

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