Effect of TRT process on GFA, mechanical properties and microstructure of Zr-based bulk metallic glass

Series of rod samples of Zr55Al10Ni5Cu30 alloy were prepared by magnetic suspend melting and copper mold suction casting method. The effect of thermal rate treatment (TRT) process on glass forming ability (GFA), mechanical properties and microstructure of Zr-based bulk metallic glass were investigated. It shows that GAF, mechanical properties and microstructure of as-cast Zr55Al10Ni5Cu30 BMGs alloy to a large extent is related to TRT process. GFA and thermal stability of as-cast Zr55Al10Ni5Cu30 alloy increase when overheating temperature increases. Supercooled liquid region ΔTx and parameter γ increase from 73 K to 89 K, from 0.413 to 0.417, respectively, when casting voltage increases from 7 kV to 10 kV. And a threshold overheating temperature is found for the fully amorphous structure, below which it may have an intersection with the crystallization position. It is found that the compressive strength increases and the compressive plasticity slightly decreases when overheating temperature increases. However, the compressive strength and the compressive plasticity simultaneously increase to 1.91 MPa and 2% when casting voltage increases to10 kV.