Effect of Aging Treatment on Fatigue Behavior of an Al-Cu-Mg-Ag Alloy

Burba, M. E.; Caton, M. J.; Jha, S. K.; Szczepanski, C J

doi:10.1007/s11661-013-1876-7

Cited by 19 publications

(5 citation statements)

References 17 publications

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“…The lifetimes group into single distributions at the higher stress levels. A signature of separation between the life-limiting and the mean populations is seen at 720 MPa similar to the behavior reported in other titanium alloys [2,3,5,6], Ni-base superalloys [7], and aluminum alloys [8]. The data in Fig.…”

Section: Resultssupporting

confidence: 83%

Probability of Life‐Limiting Fatigue Failures in Titanium Alloys

Jha

Pilchak

Szczepanski³

et al. 2016

Proceedings of the 13th World Conference on Titanium

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Fatigue lifetimes tend to separate into two populations as the stress level is decreased. The short lifetime population, termed as the life-limiting distribution, is found to be largely controlled by the small + long crack growth lifetimes. The longer lifetime population, which tends to dominate the mean-lifetime, has an increasing contribution of the crack-initiation lifetime as the stress level is decreased. Fatigue lifetime distribution in Ti-6Al-2Sn-4Zr-2Mo was studied from the perspective of the life-limiting versus the mean behavior. The crack-initiation mechanisms in the life-limiting versus the mean-lifetime failures were characterized using quantitative tilt fractography and electron back-scattered diffraction analysis, and the results were compared to other titanium alloys. A modeling approach for predicting the probability of occurrence of life-limiting failures is discussed. The approach takes into account the hierarchy of randomly occurring microstructural combinations, which is suggested to produce a distribution in fatigue deformation levels leading to a probability of a critical level of deformation accumulation for crack initiation in a very few cycles. The approach is illustrated with the help of a single phase -titanium microstructure for which predictions of the probability of occurrence of the life-limiting failures were made with respect to the stress level and the specimen volume.

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Section: Resultssupporting

confidence: 83%

Probability of Life‐Limiting Fatigue Failures in Titanium Alloys

Jha

Pilchak

Szczepanski³

et al. 2016

Proceedings of the 13th World Conference on Titanium

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show abstract

“…Previous research has shown that nanometric grains in combination with elevated content of oxide and nitride dispersoids lead to variations in precipitation kinetics, relative to those in conventionally produced Al alloys [4,24,25,27] Precipitation in the UM material followed the sequence reported for Al-Cu-Mg-Ag alloys with high Cu/Mg ratio, which was first reported by Ringer et al [69], and then confirmed by other groups [37,40,70,71]. It has been shown that there are two precipitation sequences occurring simultaneously (Table 1).…”

Section: Effect Of Cryomilling On Precipitation Kineticsmentioning

confidence: 55%

Strengthening mechanisms and deformation behavior of cryomilled Al–Cu–Mg–Ag alloy

Kurmanaeva

Topping

Wen

et al. 2015

Journal of Alloys and Compounds

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“…Higher Mg concentrations can not only increase the quenching sensitivity of AA7XXX-series Al alloys, [111] but also promote the formation of high-number density coherent GP zones after final re-aging, which may intensify the lattice distortion (for strengthening) and plane slip, resulting in relatively low electrical conductivity or unfulfilled SCC resistance and strain concentration during fatigue loading [ 42 , 62 ]. However, the interrupted T6 aging process has been proven to increase the number density of intragranular η phase that can well strengthen the alloy and improve elongation/toughness [112][113][114][115][116][117] , and it can replace the third-step peak aging of the RRA process for obtaining highnumber density fine intragranular η precipitates for alloys with a high Mg content that might benefit the damage tolerance.…”

Section: Overview Of Rra Treatment and Future Researchmentioning

confidence: 99%