Crack Growth Behaviour of Low Cycle Fatigue under Single Over-Straining in Ti-6Al-4V Alloy.

保雄, 越智; 明, 石井; 茂美, 佐々木; 一郎, 大舘

doi:10.2472/jsms.42.1172

Journal of the Society of Materials Science, Japan

1993

DOI: 10.2472/jsms.42.1172

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Crack Growth Behaviour of Low Cycle Fatigue under Single Over-Straining in Ti-6Al-4V Alloy.

越智保雄¹,

石井明²,

佐々木茂美³

et al.

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“…Although the lower fatigue crack-propagation exponent of 1.0 is probably a result of the longer fatigue lifetime of this alloy, as shown in Figure 2, the crack propagation exponent is lower than that generally suggested in earlier reports [14,15]. The reduction in the crack propagation exponent may be to the result of a particular characteristic of superplasticity.…”

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Low-cycle fatigue properties of ultrafine-grained zinc–22 wt.% aluminum alloy during room-temperature superplastic flow

et al. 2008

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Low-cycle fatigue behavior during room-temperature superplastic flow was investigated for ultrafine-grained Zn-22 wt.% Al alloy. This alloy exhibited a longer fatigue life and a lower crack propagation rate than other materials at high strain amplitudes above ±5%. In addition, many cavities and secondary cracks were observed near the tips of cracks. These are probably responsible for the apparent reduction in the crack propagation rate and the long fatigue lifetime of this alloy.

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“…Strain amplitudes at which previously reported tests on LCF have been conducted were below about ±4% [13][14][15][16]. In this study, however, it was possible to conduct cyclic tests at high strain amplitudes above ±5%, where no LCF behavior has been previously reported.…”

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confidence: 86%

Low-cycle fatigue properties of ultrafine-grained zinc–22 wt.% aluminum alloy during room-temperature superplastic flow

et al. 2008

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Low Cycle Fatigue Behaviour of Extruded AZ61 and AZ80 Magnesium Alloys

Shiozawa¹,

Nagai²,

Murai³

et al. 2009

J. Soc. Mat. Sci., Japan

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Extruded magnesium alloy shows a mechanical anisotropy caused by the particular deformation characteristics of the hexagonal crystal structure. Cyclic deformation behavior and fatigue life of the extruded AZ61 and AZ80 alloys were investigated in the total strain controlled low-cycle fatigue test in ambient atmosphere at room temperature. The low-cycle fatigue lifetime of the two alloys extruded was almost same, but AZ80 alloy treated by an artificial aging after the extrusion had shorter lifetime compared with the extruded alloy, even though higher static mechanical properties with the aging. The hysteresis loop in experiments showed asymmetric behavior in tension and in compression and differed from the hysteresis of steels et al. The particular shape of the hysteresis was caused by the difference of the yield stress between tension and compression, and pseudoelastic behavior during reloading in the opposite direction, which tends to be more pronounced in compression than in tension. The pseudoelastic strain of the aged specimen was smaller than that of the extruded specimen. It was suggested that the asymmetric phenomenon was revealed by the reversal of twins upon unloading and the fatigue fracture was affected by the formation of the twin.

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Crack Growth Behaviour of Low Cycle Fatigue under Single Over-Straining in Ti-6Al-4V Alloy.

Cited by 2 publications

References 0 publications

Low-cycle fatigue properties of ultrafine-grained zinc–22 wt.% aluminum alloy during room-temperature superplastic flow

Low-cycle fatigue properties of ultrafine-grained zinc–22 wt.% aluminum alloy during room-temperature superplastic flow

Low Cycle Fatigue Behaviour of Extruded AZ61 and AZ80 Magnesium Alloys

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