The cyclic stress-strain response of precipitation hardened Al-15 wt.% Ag alloy

Laird, C.; Langelo, V.J.; Hollrah, M.; Yang, Nae-Cherng; Veaux, R. de la

doi:10.1016/0025-5416(78)90033-2

Cited by 35 publications

(32 citation statements)

References 31 publications

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“…The zones in AI-Ag alloys are silver rich, disordered, and equiaxed [14]. In accordance with the predictions of the disordering hypothesis, this alloy was found not to soften when cycled at room temperature [13]. However, copious production of the y'/y precipitates induced by the cycling lead to sustained hardening and posed difficulties in definitive discriminating of the two hypotheses.…”

Section: Introductionmentioning

confidence: 49%

“…Since the material used in the previous investigation [13] was used up, a new batch of AI-Ag alloy was prepared. The analysis of this batch, obtained from Galbraith Laboratories, Inc., was 13.2 w/o Ag.…”

Section: (B) Preparation and Testing Of The Ai-ag Alloymentioning

confidence: 99%

“…The analysis of this batch, obtained from Galbraith Laboratories, Inc., was 13.2 w/o Ag. The alloy was prepared from stock of 99.99% purity as before, and the procedures adopted previously [13] were followed. Briefly, the ingot was forged and homogenized, swaged, solution treated and quenched.…”

Section: (B) Preparation and Testing Of The Ai-ag Alloymentioning

confidence: 99%

“…However, the recent observations of Wilhelm et al on Cu-2% Co single crystals [9,12] contradict the hypothesis although it is possible that the strain is more localized in single crystals than in polycrystals. In a further attempt to discriminate between the "disordering" and "shearing-off" idea, Laird et al [13] investigated the cyclic response of AI-Ag alloys. aged to contain G-P zones.…”

Section: Introductionmentioning

confidence: 99%

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Mechanisms of cyclic softening in precipitation-hardening alloys?A ball model approach and tests at 78 K

et al. 1981

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Tests of random, alternating cuts on a ball-model of 0" in AI-Cu alloy have been run to check the kinetics at which disordering occurs in an initially ordered precipitate subject to cyclic strain. In addition, fatigue tests at low temperature (78 K) and various microscopical observations have been made on AI-Ag alloy containing GP zones to check whether a structure containing an initially disordered precipitate will cyclically soften or not. It was thus found that the 0" ball model disorders as a function of accumulated plastic strain consistently with the kinetics of cyclic softening in actual material. Further, AI-Ag alloy was found not to soften at 78 K. Both of these results support the disordering hypothesis of cyclic softening over the "dissolution" or "shearing-off" mechanisms, although other systems may be subject to these mechanisms. In spite of the low temperature at which the AI-Ag alloy was tested, small 3//3, precipitates were found to have formed in the longest lived test; however, this result did not interfere with the validity of the experiment as it did previously at room temperature. The fatigue lives at 78 K were much longer than those previously measured at room temperature although the failure mechanisms were not affected at high strain and only somewhat affected at low strain (there was increased incidence of transgranular crack nucleation and propagation).

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Section: Introductionmentioning

confidence: 49%

Section: (B) Preparation and Testing Of The Ai-ag Alloymentioning

confidence: 99%

Section: (B) Preparation and Testing Of The Ai-ag Alloymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanisms of cyclic softening in precipitation-hardening alloys?A ball model approach and tests at 78 K

et al. 1981

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“…This phenomenon of localized softening is not restricted to Ni-base ,-superalloys, but occurs in most planar slip alloys containing coherent precipitates " -(Refs. [7][8][9][10][11]. In Ni-base superalloys, localized softening accounts for their renowned low fatigue endurance limit to yield strength ratio.…”

Section: Introductionmentioning

confidence: 99%