Dependence of High Pressure on Phase Transformation in Zr_41.2Ti_13.8Cu_12.5Ni₁₀Be_22.5

抄録

The phase transformation of Zr_41.2Ti_13.8Cu_12.5Ni₁₀Be_22.5 bulk metallic glass (BMG), which arises from compression and decompression, has been investigated by using cubic type high-pressure apparatus and Diamond Anvil Cell (DAC). The temperature of phase transformation from the amorphous to the crystalline (T_x) displays a universal decrease under high pressure. Based on the observation of in-situ resistance measurement in a DAC, 24 gigapascals (GPa) was able to lead to the crystallization event of this BMG at room temperature. The dependence of T_x on pressure (P) followed the relation of T_x=714.3−7.97P−0.399P². Moreover, an unexpected new phenomenon emerged has also been found during decompression. The high pressure induced crystalline phase reverted back to the amorphous state during downloading, which was further confirmed by TEM.