In situ X-ray diffraction investigation of compression behavior in Gd₄₀Y₁₆Al₂₄Co₂₀bulk metallic glass under high pressure with synchrotronradiation

Abstract：

The compression behavior of the heavy RE-based BMG Gd₄₀Y₁₆Al₂₄Co₂₀under high pressure has been investigated by in situ high pressure angle dispersive X-ray diffraction measurements using synchrotron radiation in the pressure range of 0~33.42 GPa at room temperature. By fitting the static equation of state at room temperature, we find the value of bulk modulus B is 61.27±4 GPa which is in good agreement with the experimental study by pulse-echo techniques of 58 GPa. The results show that the amorphous structure in the heavy RE-based BMG Gd₄₀Y₁₆Al₂₄Co₂₀keeps quite stable up to 33.42 GPa although its compressibility is as large as about 33%. The coexistence of normal local structure similar to that of other BMGs and covalent bond structure similar to those of oxide glasses may be the reason for the anomalous property under high pressure of the Gd₄₀Y₁₆Al₂₄Co₂₀BMG.