锻造耐损伤铌铝金属间化合物的断裂和疲劳裂纹扩展行为

F. Ye, C. Mercer, D. Farkas, W. Soboyejo
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引用次数: 0

摘要

阐述了一类新型耐损伤铌铝化合物Nb - 3al - xti金属间化合物断裂和疲劳裂纹扩展的微观机制。在含10%和25% at% Ti的合金中,疲劳裂纹扩展主要通过解理发生,而含~ 40 at% Ti的合金显示出与韧性金属及其合金相似的断裂和疲劳裂纹扩展行为。Nb - 3al - 40ti合金的高温裂纹扩展速率较慢(750℃),主要归因于氧化物诱导的裂纹闭合效应。从解理断裂(在Nb 3al - 10ti和Nb 3al - 25ti合金中)到延性断裂(在Nb 3al - 40ti合金中)的转变与裂纹尖端塑性的显著水平的开始相关,这是用原子模拟预测的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Fracture and Fatigue Crack Growth Behavior of Forged Damage-Tolerant Niobium Aluminide Intermetallics
The micromechanisms of fracture and fatigue crack growth are elucidated for a new class of damage-tolerant niobium aluminide Nb 3 Al-xTi intermetallics. Fatigue crack growth in alloys containing 10 and 25 at% Ti is shown to occur primarily by cleavage, while alloys containing ∼40 at% Ti are shown to exhibit similar fracture and fatigue crack growth behavior to ductile metals and their alloys. Slower elevated-temperature (750°C) crack growth rates in the Nb 3 Al-40Ti alloy are attributed largely to the effects of oxide-induced crack closure. The transition from cleavage fracture (in the Nb 3 Al-10Ti and Nb 3 Al-25Ti alloys) to ductile fracture in the Nb 3 Al-40Ti is correlated with the onset of significant levels of crack-tip plasticity, which is predicted using atomistic simulations.
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