Rapidly quenched Mg65AlxCu25−xMM10 (MM: mischmetal) alloys

Effect of Al addition to Rapidly Solidified Mg-Cu-Rare Earth Alloys

“…This could be a consequence of an intensification of the chemical heterogeneity of the amorphous structure or the formation of small fraction of crystalline order at the nanoscale. In addition, the diffractograms of the Y and Al-0 showed a weak and broad pre-peak around 2θ~20.3 o , which reveals a strong chemical short and medium range order, as it was observed in the literature 22,28,29 . The X-ray diffractograms of the Al-5 and Al-10 alloys do not show a clear pre-peak, which is in agreement with the criterion of the micro-alloying to reduce the fraction of the strong hetero-atomic clusters in the amorphous phase.…”

“…In an early work the authors observed that the fracture surface turned from featureless to a "vein pattern" features when 10at% Cu is substituted by Al in a Mg 65 Cu 25 RE 10 amorphous alloy 22 . In the present work, following the microalloying strategy for heterogeneous amorphous phase (v), the effect of different fractions of Al in substitution of Cu in a Mg 65 Cu 25 RE 10 on the glass forming, thermal stability, mechanical properties and the possible improvement on it plasticity were studied.…”

Tetragonal phase in the Mg–Ni–Sn system

“…These alloys have potential engineering applications, for instance, as structural materials (as they have a higher strength/density ratio than Al-alloys [3]) and as H-storage materials (Mg-Ni-X alloys [4]). Along these lines the Mg-(Cu/Ni)-RE (RE = rare earth) systems have been extensively studied [2,[4][5][6][7][8]. Another system with good performance is the Mg-Ni-Sn: Mg 80 Ni 15 Sn 5 (at.%) glassy alloy has fracture tensile strength as high as 900 MPa [19], which is much higher than that of a conventional Mg crystalline alloys [3].…”

“…The possibility to obtain bulk glassy samples have increased the number of studies related to the GFA in the Mg alloys [5,6,10]. In many works, the strong inter-atomic interaction and the formation of associations in the liquid state were related to the high GFA [5,7,[11][12][13][14][15].…”

“…In many works, the strong inter-atomic interaction and the formation of associations in the liquid state were related to the high GFA [5,7,[11][12][13][14][15]. Audebert et al [5] observed in the amorphous alloys of Mg-Cu-RE, an amorphous pre-peak in the X ray diffractogram at Q = 1.50 Å −1 (Q: scattering vector), similar to that observed for the Mg 2 Cu amorphous alloy [16]. They proposed that the strong interaction between Mg and Cu atoms produces associations like Mg 2 Cu in the liquid, which increases the viscosity and the GFA of this alloy.…”