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首页> 外文会议>International Conference on Aluminum Alloys >Research on the High-cycle Fatigue and Crack Initiation Behavior of AA7449 Alloy
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Research on the High-cycle Fatigue and Crack Initiation Behavior of AA7449 Alloy

机译：AA7449合金的高循环疲劳和裂纹起始行为的研究

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This study mainly focused on the high-cycle fatigue and crack initiation behavior of AA7449-T7951 alloy. The fatigue-life tests were carried out over a range of stress amplitudes with the stress ratio (R) of 0.5 and -1.0 at room temperature for both smooth and notch specimens. Further evaluations were performed with the help of optical microscopy, scanning electron microscopy and transmission electron microscopy, in order to reveal the relationships between microstructure and fatigue crack initiation behavior of this alloy. The results showed that AA7449-T791 alloy had excellent fatigue properties. The fatigue limit (σ_N) of smooth specimens was 349 MPa for R = 0.5 and 134 MPa for R = -1.0. While it was 138 MPa for R = 0.5 and 70 MPa for R = -1.0 in notched specimens with the notch factor (Kt)of 3.0. The crack initiation behavior of this alloy can be related to the joint influence of inclusions, precipitates, grain structure and their interactions with dislocations or persistent slip bands.
机译：本研究主要集中在AA7449-T7951合金的高循环疲劳和裂纹启动行为。疲劳 - 寿命试验在室温下在室温下的应力比（R）的应力比（R）的压力幅度范围内进行，用于光滑和凹口标本。在光学显微镜，扫描电子显微镜和透射电子显微镜的帮助下进行进一步的评价，以揭示该合金的微观结构和疲劳裂纹起始行为之间的关系。结果表明，AA7449-T791合金具有优异的疲劳性能。平滑样品的疲劳极限（σ_n）为r = 0.5和134MPa的349MPa，用于r = -1.0。虽然在缺口标本中为r = -1.0的r = -1.0的r = -1.0的r = -1.0的r = -1.0，但具有3.0的缺口因子（kt）的138mPa。该合金的裂纹起始行为可以与夹杂物，沉淀物，晶粒结构及其与脱离脱离滑槽的相互作用的关节影响有关。

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