Effects of Annealing and Annealing with Pressure on Devitrification of Al₈₇Ni₇Gd₆

Abstract

The effects of annealing for 30 minutes at temperatures ranging from 123-232°C on the structure evolution, resulting hardness, and tensile properties were determined for amorphous ribbons of Al 87 Ni 7 Gd 6. Structure evolution was determined using a combination of XRD, DSC, and TEM, while micro-hardness and tensile testing of ribbon specimens was used to evaluate the mechanical properties. Significant effects of annealing on the evolution of structure and properties were obtained, while the superposition of 940 MPa pressure during annealing further enhanced the structure evolution with corresponding changes to the resulting properties.

Ion Species/Energy Dependence of Irradiation-Induced Lattice Structure Transformation and Surface Hardness of Ni₃Nb and Ni₃Ta Intermetallic Compounds

“…It is well known that a broad peak in XRD spectrum indicates a state which loses the long-range ordering of atomic arrangements 39) . This is like liquid, what is called an amorphous state.…”

Estimation of diffusivity governing primary nanocrystallisation and its relation to thermal stability of amorphous phases

“…The contributions from the crystalline and residual amorphous phases were fitted with a Lorentzian function. The volume fraction of Al nanocrystals was calculated using the relative areas of the convoluted amorphous halo, A am , and crystalline, A cr , peaks (111) and (200) as X=A cr /(A cr +A am ) [23]. As it has been shown earlier [18], an underestimation of X calculated by this technique [24] has no influence on the effective diffusion coefficient values.…”

Effects of load ratio, R, and test temperature on high cycle fatigue behavior of nano-structured Al–4Y–4Ni–X alloy composites

“…Al-TM-RE (TM¼transition metals, RE ¼rare earth elements) amorphous alloys and their nanocrystalline counterparts possess high strength and bend ductility [1][2][3][4][5][6][7][8][9][10][11][12][13][14] and are being explored as low density, high strength engineering materials. Among these systems, Al-Gd-Ni and Al-4Y-4Ni alloys have been well investigated with regard to their glass formability, devitrification behaviors, as well as mechanical properties [4][5][6][7][8][9][10][11][12][13].…”

“…Among these systems, Al-Gd-Ni and Al-4Y-4Ni alloys have been well investigated with regard to their glass formability, devitrification behaviors, as well as mechanical properties [4][5][6][7][8][9][10][11][12][13]. Investigations have showed that Al-Gd-Ni and Al-4Y-4Ni metallic glass ribbons containing 80-92 at.…”