Microstructure And Thermal Stability Of Rapidly Solidified Al₈₅Y₄Nd₄M₇(M=Fe,Co) And Al₈₅Zr₄Nb₄M₇(M=Fe,Co) Alloys

Rapidly solidified Al₈₅Y₄Nd₄Fe₇, Al₈₅Zr₄Nb₄Fe₇, Al₈₅Zr₄Nb₄Co₇ and Al₈₅Y₄Nd₄Co7 (at %) alloys were prepared by melt spinning. As-quenched and as-annealed microstructures were studied by DSC, XRD, TEM and HREM. The paper analyzed the influences of Co and Fe elements for the microstructures of the rapidly solidified Al-Y-Nd and Al-Y-ZrAl-Fe alloy ,respectively, and analyzed the revolutions of Al₈₅Y₄Nd₄Fe₇, Al₈₅Zr₄Nb₄Fe₇, Al₈₅Zr₄Nb₄Co₇ and Al₈₅Y₄Nd₄Co₇ alloys at the higher temperatures.The study indicates that: l)fully amorphous structure could be obtained in the rapidly solidified A185Y4Nd4Co7 alloy ribbons. 2) simultaneous precipitation occurs at room temperatures, which are the phases of α-Al Al₃Nb and Al₉Co₂, in the rapidly solidified Al₈5Zr₄Nb₄Co₇ alloy ribbons. 3) fully amorphous structure could be obtained in the rapidly solidified A185Y4Nd4Fe7 alloy ribbons. 4) simultaneous precipitation occur at room temperatures in the rapidly solidified Al₈5Y₄Nd₄Fe₇ alloy ribbons. 5) The thermal stability of the Al₈₅Y₄Nd₄Fe₇ amorphous alloy is higher than that of the Al₈5Y₄Nd₄Co₇ amorphous alloy, which indicates that Fe element can enhance the thermal stability in Al-Y-Nd-M (M=Fe Co).