Constitution of the high-Al region of Al–Cu–Rh

An investigation of the Al-rich region of the Al–Ni–Ir phase diagram

“…This is in contrast to the metastable Al-Co and Al-Rh quasicrystals, which are stabilized by Ni (see [11,3] and references therein) or Cu (see [12,13] and references therein). In Al-Ni-Co the decagonal quasicrystals are formed in a wide compositional range and exhibit several structural modifications (see [11,14] and references therein).…”

Phase equilibria in the Al-rich region of Al–Cu–Ir

“…[4] and revealed three ternary periodic phases. The decagonal phase of ∼Al 60 Cu 24 Ir 16 examined by electron diffraction exhibited a periodicity of ∼0.4 nm in the specific direction (D 1 -structure), similar to that in Al-Cu-Rh [5]. Periodic ternary phases , C 2 and 6 (see Table 1) were found to be formed around Al 70 Cu 20 Ir 10 , Al 60 Cu 15 Ir 25 and Al 71 Cu 9 Ir 20 , respectively.…”

“…2 and the following sections by a broken line. It is worth noting that in the Al-Cu-Rh [5] and Al-Pd-Rh [10] alloy systems similar C and C 2 phases were found to coexist in narrow ranges, which were very difficult to detect. At least three invariant reactions occur in Al-Cu-Ir close to 1000 • C. They are the peritectic formation of the Al-Ir -phase [2], the formation of the D 1 -phase [6] and the above-mentioned decomposition of the high-Cu ␤ -phase.…”

“…[2][3][4][5], and at 700-540 • C in smaller compositional regions (Fig. 6) in order to achieve equilibrium for reasonable annealing times.…”

Comparative structural study of decagonal quasicrystals in the systems Al–Cu–Me (Me = Co, Rh, Ir)

“…The compositional stability range of d-Al-Cu-Co is quite extended (Grushko, 1992) in contrast to that of the line compounds d-Al-Cu-Rh and d-Al-Cu-Ir (Grushko et al, 2008;Kapush et al, 2010). Compacts with nominal compositions Al 65 Cu 20 Co 15 , Al 64.5 Cu 16.8 Rh 18.7 and Al 60 Cu 22 Ir 18 were prepared from the elements (Alfa Aesar: Al 99.9999%, Co 99.8%, Cu 99.999%, Ir 99.9%, Rh 99.95%) and arc melted.…”