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and stress corrosion cracking test. The results show that the Yb additions to high strength Al-Zn-Mg-Cu-Zr aluminum alloys can produce fine coherent dispersoids. Those dispersoids can strongly pin dislocation... recrystallization. Sc is the most effective micro-alloying element in aluminum alloys[8-9]. The effect can be more remarkable by replacing partial Sc with Zr to produce Al3(Sc, Zr) dispersoids[10-11]. But expensive......
. The results reveal that Mg has a strong influence on the distribution and volume fraction of dispersoids during precipitation heat treatment. The microhardness and yield strength at ambient... is the main strengthening mechanism to enhance the mechanical properties. In recent years, the strengthening effect of dispersoids in 3xxx alloys has been discovered [1,2]. Through a proper heat......
) alloys were fabricated by a novel in-situ reactive synthesis(IRS) and a traditional internal oxidation(IO) process. The features of alumina dispersoids in these ADSC alloys were investigated by X-ray......
-hardening effect of Al-Zr-Cr, Al-Zr-Yb, Al-Cr-Yb, Al-Zr-Cr-Yb alloys and inhibit- recrystallization ability of different kinds of dispersoids in these alloys were compared. The results show that the high... size and higher degree of dispersion of coherent Cr-containing Al3(Zr,Yb) dispersoids. Key words: Al-Zr-Yb-Cr alloys; precipitation; recrystallization; hardening 微合金化是挖掘铝合金潜力,改善合金性能的重要途径之一,也是新型铝合金研发的主......
Trans. Nonferrous Met. Soc. China 22(2012) 2645-2651 Effect of one-step and two-step homogenization treatments on distribution of Al3Zr dispersoids in commercial AA7150 aluminium alloy Xin-yu1... at 460-480 °C, a high number density of larger dispersoids can be observed in dendrite centre regions but not near dendrite edges. Furthermore, the dispersoid size increases with increasing the temperature......
strengthened (ODS) steels was described. Parametric dislocation dynamics (PDD) simulation of the interaction between an edge dislocation and randomly distributed spherical dispersoids (Y2O3) in bcc iron..., and the influence of dislocation dipole, which forms just before finishing up the Orowan looping mechanism, is substantial in determining the CRSS, especially for the interaction with small dispersoids. Therefore......
Microstructure and Strain Hardening of a Friction Stir Welded High-Strength Al–Zn–Mg AlloyA.H.Feng1,2,D.L.Chen3,Z.Y.Ma4,W.Y.Ma2,R.J.Song11. School of Materials Science and Engineering,Tongji University2. State Key Laboratory of Advanced Welding Production Technology,School of Materials Science and E......
are AlZnCu and AlCuFe phases. Compared with the fast-heating rate treatment, the slower apparently leads to a higher density of fine Al3Zr dispersoids, the dimension of the dispersoids decreases from......
(TEM). Step-quenching leads to decomposition of solid solution and heterogeneous precipitation of equilibrium phase mainly on dispersoids and at grain boundaries; thus lower hardness after aging... inside grains after aging. Isothermal holding at 355 ℃ results in heterogeneous precipitation of η phase both on dispersoids and at grain boundaries. Isothermal holding at 235 ℃ results in heterogeneous......
of concurrent precipitation has a strong effect, otherwise the effect will be limited. Pre-existing fine and dense dispersoids (mean size 0.1 μm) before back-annealing do also lead to a coarse grain structure... may strongly affect the microstructural evolution and associated mechanical properties during processing. It is well established that the dispersoids retard the recovery and recrystallization kinetics......
