Fe–Ni–Zr–Cr–Si–B-basedBMGsexhibited good glass forming ability. Note that the addition of Zr andWelements brought about the significant increase of Trg and gradual decrease of _Tx. Based on the X-ray results, the maximum glass forming thickness in these alloys was found to be between 1 and 2mm regardless of the alloy composition. The Fe–Ni–Cr–Si–B and Fe–Ni–Zr–Cr–W–Si–B amorphous strips had the similar tensile strengths, which was higher than that of the Fe–Ni–Zr–Cr–Si–B strip. On the other hand, the cylindrical samples of the composite-type BMG with diameter of 2mm exhibited high compressive strength σc.f. ranging from 2.00 to 2.93 GPa and compressive plastic strain ranging from 0.35 to 4.03%.
The significant enhancement of ductility and appropriate strength in Zr-added, Fe–Ni–Zr–Cr–Si–B, composite-type BMG alloy were mainly attributed to the homogeneously distributed 3–7 nm nanocrystal precipitates. The new approach to manufacturing BMGs indicates that twin roll strip casting could be applied to the fabrication of the sheets of Fe–Ni–Cr–Si–B-based BMG alloys with comparatively low critical cooling rate. The BMG sheet manufactured through continuous roll casting especially in Fe–Ni–Cr–Si–B-based alloy systems is also expected to promote the use of BMG materials as new structural components in the future.
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