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

Abstract

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.

Evolution of dispersoids and their effects on elevated-temperature strength and creep resistance in Al-Si-Cu 319 cast alloys with Mn and Mo additions

“…The total strain of the deformed samples was 0.2 at a strain rate of 0.001 s -1 . The creep tests were performed at 300C for 100 h under the compression mode using various loads (25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40). Each condition was repeated at least thrice.…”

Enhanced Elevated-Temperature Strength and Creep Resistance of Dispersion-Strengthened Al-Mg-Si-Mn AA6082 Alloys through Modified Processing Route

“…Figure 9 a shows the minimum creep rate ε as a function of the applied stress on a logarithmic scale. The values of the threshold stress σ th were obtained when the minimum creep rates ( ε ) at different stresses were extrapolated by linear fitting to the creep rate of 10 −10 s −1 , below which the creep is experimentally not measurable [ 24 , 25 ]. As shown in Figure 9 a, the minimum creep rate ε was always the lowest in 1Mn(LL) followed by 0.5Mn(LH) and 0.5Mn(LL) at all applied stresses, and the threshold stress σ th increased from 11.4 MPa in 0.5Mn(LL) to 13.6 MPa in 0.5Mn(LH) and further to 15.6 MPa in 1Mn(LL).…”

“…Figure 9 b shows the plots of the minimum creep rate ε against the effective stress σ−σ th on a logarithmic scale. The slopes of the ln ε −ln( σ−σ th ) curves determined the values of the true stress exponent n [ 25 ]. In the literature, n is frequently used to identify the mechanisms that control creep deformation.…”

Review on recent progress in Al–Mg–Si 6xxx conductor alloys

“…Owing to the ever-increasing demands, developing high strength and highly conductive cables has received great attention in research in recent decades. Aluminum alloys have been considered an appropriate substitution for copper conductors owing to their distinctive properties, such as lower cost and higher strength/weight ratio, relative to Cu conductors [ 1,2,3 ]. Conductors made of aluminum alloys present inferior electrical conductivity (EC), but their density is one-third that of Cu conductors.…”

“…The mass resistivity is defined by the combination of the electrical resistivity and density. Therefore, the high mass resistivity of Cu conductors, which is approximately twice as high as that of aluminum conductors, implies a relatively higher conduction capacity in Al conductors than in Cu conductors with the same weight [ 2 ].…”