金属玻璃中的非晶多形态转变

曾桥石, 尹梓梁, 楼鸿波

Polyamorphic Transitions in Metallic Glasses

ZENG Qiaoshi, YIN Ziliang, LOU Hongbo

图1 铈基金属玻璃在高压下的不连贯体积和体模量变化[59,60] (a) specific volume versus pressure for Ce55Al45 metallic glass (P—pressure, V—volume, LDA—low-density amorphous, U—the Hubbard term. Four different symbols represent four different in situ XRD runs on four different samples, where the open symbols are for compression, and the solid symbols are for decompression. The equation of state (EOS) predicted using first-principles calculations for different f-electron behaviours are also shown: the upper and lower line represent the calculation assuming 4f localized and delocalization, respectively. For clarity, errors bars are shown only for one set of the data)[59] (b) bulk modulus versus pressure obtained by in situ high-pressure XRD on the La32Ce32Al16Ni5Cu15 bulk metallic glass (A distinct break of bulk modulus occurs at 14 GPa, and the slopes below and above 14 GPa are different within the experimental uncertainty)[60]

Fig.1 Discontinuous changes of volume and bulk modulus as a function of pressure discovered in Ce-based metallic glasses