Effect of Heat Treatment on Low‐Cycle Fatigue Performance of LZ91 Mg–Li Alloy

Li, Yang; Lu, Zhan; Liu, Shuhao; Li, Dalei; Zou, Yun

doi:10.1002/adem.202100281

Cited by 5 publications

(10 citation statements)

References 25 publications

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“…Stress–strain curves of Base 11 and UNSM specimens. [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

“…Stress amplitude fatigue life curves of Base 11 and UNSM specimens using (A) 0.4% strain, (B) 0.5% strain, and (C) 0.6% strain. [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

“…Relationship of the cyclic stress and plastic stress amplitudes of Base 11 and UNSM specimens. [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

“…The chemical composition of the LZ91 Mg–Li alloy was 8.9% Li, 0.98% Zn, 0.05% Mn, 0.01% Cu, 0.001% Na, 0.001% Fe, 0.02% Si, and balance Mg (in wt.%). The physical and mechanical properties of LZ91 Mg–Li alloy are as follows: the density, the hardness, yield strength, tensile strength, and elongation of LZ91 Mg–Li alloy are approximately 1.48 g·cm −3 , 43 HV, 105 MPa, 137 MPa, and 55%, respectively 4,11 . The experiments were conducted using a UNSM instrument (Shandong Huayun Co. Ltd., Jinan, China).…”

Section: Methodsmentioning

confidence: 99%

“…10 In addition, our group investigated the effect of heat treatment on the low-cycle fatigue performance of an LZ91 Mg-Li alloy. 11 The increased α phase microhardness was found to decelerate the crack growth rate and heat treatment can improve the low-cycle fatigue life of the alloy. Ultrasonic nanocrystal surface modification (UNSM) is an emerging SSPD technology that processes the material surface via a tool head; this causes severe plastic deformation and forms a strengthened layer at a certain depth.…”

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Enhanced low‐cycle fatigue behavior LZ91 Mg–Li alloy with ultrasonic nanocrystal surface modification

Zou

Shen

et al. 2023

Fatigue Fract Eng Mat Struct

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Ultrasonic nanocrystal surface modification (UNSM) is widely used to improve the high-cycle fatigue properties of metals. However, research on the effect of UNSM on the low-cycle fatigue behavior of metals, particularly magnesium (Mg) alloys, is limited. In this study, the LZ91 Mg-Li alloy is strengthened using UNSM. The microstructures, surface roughness, tensile properties, and low-cycle fatigue properties of the strengthened LZ91 alloy are measured. The results reveal that the surface roughness decreases and the hardness increases significantly after UNSM treatment, particularly the hardness of the α phase. Furthermore, the α phase is elongated and aligned along the direction of processing rotation. When fatigue cracks encounter the hardened α phase, they follow an easier expansion direction. Therefore, the crack extension mode changes to increase the fatigue life of the LZ91 alloy. K E Y W O R D S fatigue cracking, low-cycle fatigue, Mg-Li alloy, ultrasonic nanocrystal surface modification Highlights • The UNSM treatment improves the mechanical properties of LZ91 Mg-Li alloy. • The hardened α phase changed the crack expansion pattern after UNSM treatment. • The UNSM treatment improves the fatigue life of LZ91 Mg-Li alloy. | INTRODUCTIONMg-Li alloys are green engineering materials in the 21st century and have attracted considerable attention in various fields because of their low density, high specific strength, stiffness, good processing, and recycling properties. 1,2 The LZ91 Mg-Li alloy has multiple applications in various fields. In the aerospace industry, it can be used to construct rocket cabin bodies and lunar landing platform components. In the field of weapons, it can be utilized as missile tails, shells, armor, and bulletproof material. 3,4 However, these components are subjected to cyclic deformation or vibration caused by factors such as airflow and weather. 5 This can lead to low-cycle fatigue damage. Owing to their low strength and hardness, poor formability, and difficulty in obtaining high-quality surface properties, the widespread use of Mg-Li alloys is limited. Hence, the surface integrity

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“…Stress–strain curves of Base 11 and UNSM specimens. [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

“…Stress amplitude fatigue life curves of Base 11 and UNSM specimens using (A) 0.4% strain, (B) 0.5% strain, and (C) 0.6% strain. [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

“…Relationship of the cyclic stress and plastic stress amplitudes of Base 11 and UNSM specimens. [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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