Effects of pre-rolling on mechanical properties and fatigue crack growth rate of 2195 Al-Li alloy

While pre-deformation is often conducted before aging treatment to increase the strength and microhardness of 2195 Al-Li alloy, it often increases the fatigue crack growth (FCG) rate and thus reduces the fatigue life of the alloy. To determine the effects and causes of pre-deformation and heat treat...

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Bibliographic Details
Published in:Journal of Central South University 2022-03, Vol.29 (3), p.836-847
Main Authors: Chen, Meng-xi, Li, Yi-bo, Xia, Lin-yan, Huang, Ming-hui, Wu, Zhen-yu, Yang, Yi, Qu, Zi-jing
Format: Article
Language:English
Subjects:
Aging (metallurgy)
Aluminum-lithium alloys
Crack propagation
Deformation
Deformation effects
Engineering
Fatigue failure
Fatigue life
Fracture mechanics
Heat treatment
Mechanical properties
Metal fatigue
Metallic Materials
Microhardness
Modulus of elasticity
Predeformation
Stress intensity factors
Tensile strength
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Summary:While pre-deformation is often conducted before aging treatment to increase the strength and microhardness of 2195 Al-Li alloy, it often increases the fatigue crack growth (FCG) rate and thus reduces the fatigue life of the alloy. To determine the effects and causes of pre-deformation and heat treatment on the mechanical properties and FCG rate of 2195 Al-Li alloy, and to provide a suitable calculation model for the FCG rate under different pre-deformation conditions, 2195 Al-Li alloy specimens with different degrees of pre-rolling (0, 3%, 6%, and 9%) were investigated. The experimental results indicate that with the increase of pre-rolling, the density of the T 1 phase and the uniformity of the S ′ distribution and the microhardness, tensile strength, and yield strength of the alloy increase and at the same time the FCG rate increases, and thus the fatigue life is reduced. It was also found that the normalized stress intensity factor of elastic modulus ( E ) can be applied to correlate the FCG rate of pre-rolled 2195 Al-Li alloy with constant C and K parameters.
ISSN:2095-2899
2227-5223
DOI:10.1007/s11771-022-4969-x