Static creep behaviour of Al-Zn-Mg and Al-Zn-Mg-Cu alloys

Park, Jong Geon; Lee, Deuk Yong; Choi, Jee‐Hye

doi:10.1007/bf00687306

Cited by 14 publications

(16 citation statements)

References 11 publications

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“…(a) denuded zones have been observed in the dislocation creep range when n ffi 9 for 7075 [39]; and (b) pre-existing PFZs were certainly detectable [36] in an alloy similar in composition and microstructure to 7075, namely 7010 (nominal composition (wt.%) Al-6.2Zn-2.35Mg-1.7Cu-0.1Zr).…”

Section: Formation Of Precipitate-free Zonesmentioning

confidence: 96%

The role of grain boundaries in creep strain accumulation

Wilshire

Whittaker

2009

Acta Materialia

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To explain the seemingly complex results obtained when creep property measurements are described using power-law equations, it is commonly assumed that a transition from dislocation to diffusional creep processes occurs with decreasing applied stress. However, this assumption is negated by observations recorded for aluminium, copper and various particle-hardened alloys. Thus, all features of powerlaw behaviour for copper are predicted by new relationships based on normalization of the stress through the yield and ultimate tensile stresses determined from high-strain-rate tests at the creep temperatures. Moreover, the particle-free zones sometimes found on grain boundaries normal to the tensile axis exist prior to creep exposure, so do not provide definitive evidence for diffusional creep mechanisms. It is therefore proposed that the dominant dislocation processes differ only in detail as the test duration and temperature increase.

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Section: Formation Of Precipitate-free Zonesmentioning

confidence: 96%

The role of grain boundaries in creep strain accumulation

Wilshire

Whittaker

2009

Acta Materialia

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“…Therefore, finely-dispersed precipitates obtained through an optimum T6 heat treatment yield a possibility to increase creep resistance for precipitation hardening alloys. The creep properties of wrought 7075 Al alloy have been widely studied [9][10][11][12]. This study examined the creep properties of semi-solid cast 7075 alloy that was produced by a novel Gas Induced Semi-Solid (GISS) process and processed via the optimum T6 heat treatment to induce finely-dispersed precipitates.…”

Section: Introductionmentioning

confidence: 99%

Creep rupture behavior of semi-solid cast 7075-T6 Al alloy

Mahathaninwong

Zhou

Babcock

et al. 2012

Materials Science and Engineering: A

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“…[2]), the procedures that superimpose the values in Figure 9 also rationalize the corresponding t f data from Figure 1(b), as shown in Figure 10. The results presented in Figures 9(a) and 10(a) then demonstrate that the stress and temperature dependences of and t f can be described [21] as [22] where B* and V are constants, while is the activation energy for creep (145 kJ mol Ϫ1 ) determined at constant (/ y ). Alternatively, to comply with Eq.…”

Section: E Rationalization Of Creep and Creep Rupture Data For 7010mentioning

confidence: 76%

Theoretical and practical implications of creep curve shape analyses for 7010 and 7075

Burt

Wilshire

2006

Metall Mater Trans A

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Over tensile stress ranges giving creep lives up to 2000 hours at 373 to 463 K, the creep and creep fracture properties of 7010 are compared with results recorded for 7075 and other precipitation-hardened aluminum alloys. Using the methodology to quantify the systematic variations in creep curve shape with changing test conditions, the behavior patterns displayed by the different alloys are shown to depend on the extent to which precipitate coarsening causes a progressive loss of creep strength with increasing test duration and temperature. The relationships also introduce new approaches for rationalization and interpretation of creep data sets, based on the activation energy for lattice diffusion in the alloy matrices and the yield stress or UTS at the creep temperatures.

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Static creep behaviour of Al-Zn-Mg and Al-Zn-Mg-Cu alloys

Cited by 14 publications

References 11 publications

The role of grain boundaries in creep strain accumulation

The role of grain boundaries in creep strain accumulation

Creep rupture behavior of semi-solid cast 7075-T6 Al alloy

Theoretical and practical implications of creep curve shape analyses for 7010 and 7075

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