Chinese Acad Sci, Inst Phys, Ctr Condensed Matter Phys, Beijing 100080, Peoples R China
; Chinese Acad Sci, Inst High Energy Phys, BSRF, Beijing 100039, Peoples R China
; Yanshan Univ, Coll Mat Sci & Chem Engn, Qinhuangdao 066004, Peoples R China
The compression behaviour of a Pd39Ni10Cu30P21 bulk metallic glass is investigated at room temperature up to 23.5 GPa using in situ high pressure energy dispersive x-ray diffraction with a synchrotron radiation source. Pressure induced structural relaxation of the bulk metallic glass is exhibited within the pressure range. It is found that below about 5 GPa, the existence of excess free volume contributes to rapid structural relaxation, which gives rise to rapid volumetric change. Under higher pressure, further relaxation results in structural stiffness.