Effects of Sc, Zr and Ti on the microstructure and properties of Al alloys with high Mg content

Abstract

The effects of trace Sc, Zr, and Ti on the microstructure and hardness of Al alloys with high Mg content (Al-6Mg, Al-8Mg, and Al-10Mg) were studied by optical microscope, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Brinell hardness. The grain size of the as-cast alloys was refined by the addition of Sc and Zr, and it was further refined by the addition of Ti. With the same contents of Sc, Zr, and Ti, an increase in Mg content was beneficial to the refinement due to the solution of Mg into α-Al. The refined microstructures of the as-cast alloys were favorable for Brinell hardness. Addition of Sc, Zr, and Ti to the Al-10Mg alloy results in the improvement of peak hardness and it is about 45% higher than that of the Al-10Mg alloy, which is due to fine precipitations of

Precipitation of Al3Zr Dispersoids under Various Homogenization and Its Effect on Recrystallization in 2198 Al–Cu–Li Alloy

“…[ 17,18 ] According to investigations, [ 19–21 ] denser, finer, and more desirable distribution of L1 2 ‐structure Al 3 Zr dispersoids can efficiently enhance the recrystallization resistance during subsequent thermomechanical processes. [ 22 ]…”

“…[17,18] According to investigations, [19][20][21] denser, finer, and more desirable distribution of L1 2 -structure Al 3 Zr dispersoids can efficiently enhance the recrystallization resistance during subsequent thermomechanical processes. [22] Hitherto, numerous researches indicated that ideal Al 3 Zr dispersoids and dispersion distribution were obtained after double-step homogenization treatment in 5xxx, [23] 7xxx, [11,24,25] and 2xxx [26,27] series alloys. For example, Wang [14] and Guo [15] both investigated the difference in precipitation feature of Al 3 Zr and its impact on recrystallization resistance between single-and double-step homogenization in 2195 alloy.…”

Effect of Zn and Cu Addition on Microstructure and Mechanical Properties of Al-10wt%Mg Alloy

“…The equilibrium Al 3 Mg 2 phase is a face-centered cubic structure; the lattice parameter a = 2.824 nm; the orientation relationship between the Al 3 Mg 2 phase and Al matrix is (111)β (001)α and [110]β [010]α. Mn [7] can partially be dissolved in the Al matrix to enhance solid-solution strengthening, or precipitate as the Al 6 Mn phase, which contributes to precipitation strengthening. Ti can significantly refine the alloy grain, obtain smaller grain size and improve the grain-boundary strengthening effect [8]. Rare-earth elements [9][10][11] such as Sc, Zr and Er can refine grains and improve grain-boundary strengthening.…”

Synthesis of Complex-Alloyed Nickel Aluminides from Oxide Compounds by Aluminothermic Method

“…Their initial melting point is higher than that of Ni-Al alloys [4]. The most effective way to control the structure of aluminum (nickel) alloys is to introduce small amounts of transition metals (TM) as additions to binary [5][6][7][8][9][10] and multicomponent [11][12][13][14][15][16][17][18][19] master alloys: Al-TM (Ti, Zr, Sc, Hf, etc.) and Al-Sc-Zr; Al-Zr-Ti; Al-Sc-Ti; etc.…”