Creep of Al–0.2Sc–0.04Zr alloys after different cold-rolling and ageing combinations

Li, W.J.; Cai, Bin; Wang, Yichang; Liu, Z.X.; Shi, Yang

doi:10.1016/j.msea.2014.07.071

Cited by 8 publications

(4 citation statements)

References 26 publications

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“…ε is the steady creep rate, A is a structure-dependent constant, σ is the applied stress, n and Q a are the apparent stress exponent and apparent activation energy, respectively, R and T are the gas constant and absolute temperature, respectively. It is noted that the apparent stress exponents and apparent activation energies of three Al-Cu-Mg-Ag alloys are much larger than those of pure Al (4.4 and 142 kJ/mol, respectively), which suggests the existence of a threshold stress σ th [32][33][34]. The driving force for creep deformation is the effective stress (σ-σ th ), so the power-law Equation (1) can be modified by introducing threshold stress as:…”

Section: Creep Mechanism and Threshold Stressmentioning

confidence: 97%

“…Assuming that σ th independent of the creep stress, if an appropriate value of n can be fitted to a straight line through the data points in the plot of . ε 1/n versus σ, the threshold stress σ th at each temperature can be obtained by extrapolating the linear regression line to the zero-creep rate [32][33][34]. The value of the true stress exponent n can indirectly reflect the creep mechanism [32][33][34][35][36]: n = 1 for diffusional creep, n = 2 for creep controlled by the grain boundary sliding, n = 3 for creep controlled by the dislocation viscous glide process, and n = 5 for creep controlled by the dislocation climb.…”

Section: Creep Mechanism and Threshold Stressmentioning

confidence: 99%

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Creep Behavior and Microstructural Evolution of Al–Cu–Mg–Ag Alloys with Various High Cu Contents

Peng

Wang

Yang

et al. 2021

Metals

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The creep behavior and microstructural evolution of three Al–Cu–Mg–Ag alloys with Cu content around its solid solubility limit in Al (5.65 wt %) were investigated at 180–240 °C and applied stress of 150–300 MPa. The creep resistance of aged alloy, which is mainly determined by the number density of Ω phase, is the best for 6.00 wt % Cu, better for 5.30 wt % Cu, and the worst for 5.65 wt % Cu. After solid-solution treatment, the lowest Cu content in the Al matrix for the alloy with 5.65 wt % Cu is observed due to the existence of more residual phases. It results in the lowest number density of Ω phase the following aging and poor creep resistance. Increasing temperature from 180 to 240 °C at the same stress (225 MPa), the steady creep rate of alloys increases by 225 times, which is apparently larger than that (26 times) for increasing stress from 225 to 300 MPa at the same temperature (180 °C). It indicates that the coarsening of the Ω phase with increasing temperature should be more serious than that with increasing stress. The creep mechanism of Al–Cu–Mg–Ag alloy can be attributed to the dislocation climb with the existence of threshold stress.

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Section: Creep Mechanism and Threshold Stressmentioning

confidence: 97%

Section: Creep Mechanism and Threshold Stressmentioning

confidence: 99%

Creep Behavior and Microstructural Evolution of Al–Cu–Mg–Ag Alloys with Various High Cu Contents

Peng

Wang

Yang

et al. 2021

Metals

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“…The need for an adequate creep resistance at modest temperatures in light alloys was recognized and explored in several studies 24 . However, most of the works on creep were conducted at high temperatures T > 0.5 Tm 11,13,25 . Sherby et al 13 studied the effect of Fe on the creep in aluminum at a temperature higher than 200 C (T > 0.5 Tm) and Marquis et al 11 studied the presence of the threshold stress of Al-Sc alloys at 300 C.…”

Section: Introductionmentioning

confidence: 99%

“…24 However, most of the works on creep were conducted at high temperatures T > 0.5 T m . 11,13,25 Sherby et al 13 studied the effect of Fe on the creep in aluminium at a temperature higher than 200°C ( T > 0.5 T m ) and Marquis et al . 11 studied the presence of the threshold stress of Al–Sc alloys at 300°C.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fe-rich particles and solutes on the creep behaviour of 8xxx alloys

Pan

Mirza

Liu

et al. 2017

Materials Science and Technology

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The creep behavior of 8xxx aluminum conductor alloys with different amounts of Fe-rich particles and solutes was investigated. Creep resistance is significantly improved by large amounts of Fe-rich particles and solutes. At 100 °C, a high Fe content of solutes (0.023 wt.%) had a stronger effect on creep resistance than FeAl3 particles, while as the temperature increased to 150 and 200 °C, the effect of a high amount of FeAl3 particles (2.5 vol.%) was stronger than that of Fe solutes. The threshold stress increased with increasing FeAl3 particle and Fe solute contents but decreased with increasing temperature. The increase of the threshold stress due to FeAl3 particles and Fe solutes is independent. The true stress exponent was calculated to be 3.1, 3.8, and 4.5 at 100, 150 and 200 C, respectively.

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Dependence of Creep Properties on Aging Treatment in Al–Cu–Mg Alloy

Zhang

et al. 2022

Adv Eng Mater

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The mechanical properties are strongly associated with the heat treatment applied in the Al–Cu–Mg alloys. The peak aging treatment is normally employed following solution treatment to achieve a peak aging hardening effect. However, herein, it is shown that the creep resistance is improved at under‐aged (UA) conditions, where the material is transiently weaker than that at peak condition. Under the creep condition of 185 °C and 150 MPa, the creep fracture time of the UA (4 h) alloy is the longest at 146.5 h, followed by 128 h of the peak‐aged alloy and 72 h of the over‐aged alloy. The stress exponents are about 4, which indicates that the creep deformation mechanism of the alloy is mainly due to fracture caused by dislocation slip and grain boundary (GB) migration. Combined with the first‐principles calculation, the reason for the longer creep fracture time of the UA alloy is that the solutes Cu and Mg retained in the UA alloy interact with GBs and dislocations during creep.

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Creep of Al–0.2Sc–0.04Zr alloys after different cold-rolling and ageing combinations

Cited by 8 publications

References 26 publications

Creep Behavior and Microstructural Evolution of Al–Cu–Mg–Ag Alloys with Various High Cu Contents

Creep Behavior and Microstructural Evolution of Al–Cu–Mg–Ag Alloys with Various High Cu Contents

Effect of Fe-rich particles and solutes on the creep behaviour of 8xxx alloys

Dependence of Creep Properties on Aging Treatment in Al–Cu–Mg Alloy

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