Influence of grain structure and precipitates on fatigue crack propagation behaviors of Al-xCu-1.2Li-X alloys
Source abstract
Abstract
The fatigue crack propagation (FCP) rates of the Al- xCu-1.2Li-X ( x=4.2, 4.5 wt%) alloys with various heat treatment states were systematically investigated and correlated crack growth mechanism was further elucidated. The finer recrystallized grains and more equivalent slip system numbers provided more beneficial conditions for crack deflection and bifurcation, leading to the decreased FCP rate in short-term natural-aged (ST-T4) MC alloy. Moreover, the crack tips hardly activated the slip system within the adjacent grains when their twist angle differences for four slip surfaces were >10°, and the crack tended to propagate along the grain boundaries. With increasing Cu content of T8-aged alloy, the number density and dimension of T 1 and θ′ precipitates are simultaneously increased, and the strengthening mechanism of T 1 precipitates transformed from shearing to by-passing. Thus, the crack tips required more energy for transgranular propagation, causing the tendency of propagation to the grain boundaries and increased FCP rate in T8-aged HC alloy. However, the high Cu content levels resulted in the preferential precipitation of Guinier-Preston (G.P) zones during T6 aging. The δ′ and θ′ precipitates are increased and the nucleation of by-passed T 1 precipitates is suppressed in T6-aged HC alloy, leading to a significantly decreased FCP rate compared to that of MC alloy.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Aluminum Alloy Microstructure Properties · Aluminum Alloys Composites Properties · Advanced Welding Techniques Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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