High-cycle fatigue behavior of Mg-8Li-3Al-2Zn-0.5Y alloy under different states

Peng, Xuan; Liang, Xin-Li; Liu, Wencaı; Wu, Guohua; Ji, Hao; Tong, Xin; Zhang, Liang; Ding, Wei

doi:10.1016/j.jma.2020.07.012

Cited by 21 publications

(2 citation statements)

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“…Fatigue data associated with the stress amplitude σ a and fatigue life N f of LZ91 alloy are shown in Figure 5. Fatigue data from other Mg–Li and magnesium alloys are included for comparison 19,31,32 . “Run‐out specimens” indicates that the fatigue life of the specimen reached a limit of 1 × 10 7 (for LAZ832‐0.5Y alloy) and 1 × 10 9 (for the other three alloys).…”

Section: Resultsmentioning

confidence: 99%

“…Fatigue data from other Mg-Li and magnesium alloys are included for comparison. 19,31,32 "Run-out specimens" indicates that the fatigue life of the specimen reached a limit of 1 Â 10 7 (for LAZ832-0.5Y alloy) and 1 Â 10 9 (for the other three alloys). The nonlinear curves fitted to these fatigue data (dashed lines) were obtained by Basquin's equation.…”

Section: Nanoindentation Resultsmentioning

confidence: 99%

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Crack initiation and propagation characteristics of a dual‐phase Mg–Li alloy under high‐cycle and very‐high‐cycle fatigue regimes

Wang

Xue

et al. 2021

Fatigue Fract Eng Mat Struct

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Ultralight Mg–Li alloys are promising aerospace materials as they are the lightest structural alloys at present; however, their fatigue behaviors remain to be explored. This work focuses on the fatigue strength and crack initiation behavior of an extruded dual‐phase Mg–Li alloy (LZ91) under high‐cycle and very‐high‐cycle fatigue regimes. The fatigue limit of LZ91 alloy at 109 cycles was determined to be 78 MPa, and the fatigue ratio is 0.46. Microstructural characterization demonstrates that fatigue cracks tend to initiate at β‐Li phase‐enriched regions. The α‐Mg phase presents a < 10true1¯0> fiber texture with a basal plane that has low deformation in the extrusion direction and acts as an enhanced phase in relation to the β‐Li phase. Deformation discrepancies cause localized cyclic plasticity at the Li phase that leads to fatigue crack initiation.

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Section: Resultsmentioning

confidence: 99%

Section: Nanoindentation Resultsmentioning

confidence: 99%