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首页> 外文期刊>MATEC Web of Conferences >Influence of microstructural discontinuities on the behaviour of long cracks in the VHCF regime for the aluminium alloys EN AW 6082 and EN AW 5083
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Influence of microstructural discontinuities on the behaviour of long cracks in the VHCF regime for the aluminium alloys EN AW 6082 and EN AW 5083

机译：ENAW 6082和EN AW 5083铝合金的组织不连续性对VHCF制度中长裂纹行为的影响

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摘要

In the present study two different aluminium alloys, the precipitation hardening alloy EN AW 6082 (peak-aged and overaged) and the work-hardening alloy EN AW 5083 (soft annealed) were examined. Fatigue cracks were initiated by means of a focused ion beam notch and a longdistance microscope was used for in-situ observation of the crack growth behaviour. The crack growth was investigated at constant stress intensity factors near the threshold regime. During the insitu investigation a change in crack growth velocity was detected. It could be observed that the barrier function of grain boundaries and primary precipitations are the major reason for crack growth retardation despite the fact that the crack is in the long crack growth range. The microstructural influence becomes more important with decreasing ΔK values, meanwhile the average crack growth rate decreases simultaneously. Experimental results have shown that the Febased precipitates are influencing the crack growth rate for both aluminium alloys. Meanwhile, grain boundaries are causing a deceleration of the crack growth rate primarily in case of the work hardened aluminium alloy. This is assumed to be the reason for the smaller average crack growth rate in EN AW 5083 compared to that observed for the precipitation hardening alloy while applying comparable ΔK values.
机译：在本研究中，研究了两种不同的铝合金：沉淀硬化合金EN AW 6082（峰值时效和过时效）和加工硬化合金EN AW 5083（软退火）。疲劳裂纹是通过聚焦离子束切口引发的，并使用长距离显微镜对裂纹扩展行为进行现场观察。在恒定应力强度因子接近阈值状态下研究了裂纹扩展。在现场调查中，发现了裂纹扩展速度的变化。可以观察到，尽管裂纹在较长的裂纹扩展范围内，但晶界和初生析出物的阻挡功能是裂纹扩展延迟的主要原因。随着ΔK值的减小，显微组织的影响变得越来越重要，同时平均裂纹扩展速率也同时下降。实验结果表明，铁基沉淀物影响两种铝合金的裂纹扩展速率。同时，主要是在加工硬化铝合金的情况下，晶界引起裂纹扩展速率的降低。这被认为是与应用了ΔK值的沉淀硬化合金相比，EN AW 5083中平均裂纹扩展率较小的原因。

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