Effect of remelting treatment on glass forming ability of RE (Gd, Sm)56Al26Co18 alloys

Influence of remelting on oxidation behaviour and hardness of Sm56Al26Co18amorphous alloy

“…After remelting treatment, the oxidation resistance property of the amorphous ribbons prepared by remelting is promoted, which may be attributed to some homogeneous structure of the amorphous ribbons prepared by first time melting, which are kept during the remelting procedure. Figure 4 shows the isothermal weight gain curves of the amorphous ribbons prepared by first time melting and amorphous ribbons prepared by remelting at the 1 X-ray diffraction patterns of amorphous ribbons prepared by first time melting Sm 56 Al 26 Co 18 (1) Fig. 5.…”

“…After the master alloy was obtained, the amorphous ribbons prepared by first time melting [indicated by Sm 56 Al 26 Co 18 (1)] was prepared by a single roller spinning apparatus. Then, Sm 56 Al 26 Co 18 (1) ribbon was remelted and injected to the single roll, and the amorphous ribbons prepared by remelting were obtained, indicated by Sm 56 Al 26 Co 18 (2), and the BMG rod prepared by first time melting Sm 56 Al 26 Co 18 (3) was obtained using the copper mould suction casting method. The BMG rod prepared by remelting Sm 56 Al 26 Co 18 (4) was prepared using the Sm 56 Al 26 Co 18 (3) as the master alloy.…”

“…Then, Sm 56 Al 26 Co 18 (1) ribbon was remelted and injected to the single roll, and the amorphous ribbons prepared by remelting were obtained, indicated by Sm 56 Al 26 Co 18 (2), and the BMG rod prepared by first time melting Sm 56 Al 26 Co 18 (3) was obtained using the copper mould suction casting method. The BMG rod prepared by remelting Sm 56 Al 26 Co 18 (4) was prepared using the Sm 56 Al 26 Co 18 (3) as the master alloy. The oxidation experiments were carried out in dry air by thermogravimetric analysis (TGA).…”

“…Therefore, the alloys have been crystallised at the temperature of 923 K. The compositions of the oxidised alloys of the amorphous ribbons prepared by first time melting and amorphous ribbons prepared by remelting are almost consistent. Figure 7 shows the XRD patterns of the oxidised Sm 56 Al 26 Co 18 (1) and Sm 56 Al 26 Co 18 (2) alloys at 473 K for 360 min in dry air. In the figure, there are some small Bragg peaks on a wide broadening peak, indicating a small amount of crystallisation phases on the amorphous Fig.…”

“…A comparison study indicates that the compositions of oxides are the same for the amorphous ribbons prepared by first time melting and amorphous ribbons prepared by remelting. Figure 8 shows the XRD patterns of the oxidised amorphous ribbons prepared by first time melting Sm 56 Al 26 Co 18 (1) and amorphous ribbons prepared by remelting Sm 56 Al 26 Co 18 (2) at 673 K for 360 min in dry air. From the figure, some crystalline peaks can be obviously observed on the wide broadening peak, which indicates that some crystallisation phases form on the amorphous matrix.…”