Stability of Bulk Metallic Glass Structure.

Jain, H. ; Williams, D. B.

Technical Information Center Oak Ridge Tennessee

关键词: Metallic glasses;    Alloys;    Absorption;    Atoms;    Bonding;   

RP-ID  :  DE2005825897

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

The fundamental origins of the stability of the (Pd-Ni)(sub 80)P(sub 20) bulk metallic glasses (BMGs), a prototype for a whole class of BMG formers, were explored. While much of the properties of their BMGs have been characterized, their glass-stability have not been explained in terms of the atomic and electronic structure. The local structure around all three constituent atoms was obtained, in a complementary way, using extended X-ray absorption fine structure (EXAFS), to probe the nearest neighbor environment of the metals, and extended energy loss fine structure (EXELFS), to investigate the environment around P. The occupied electronic structure was investigated using X-ray photoelectron spectroscopy (XPS). The (Pd-Ni)(sub 80)P(sub 20) BMGs receive their stability from cumulative, and interrelated, effects of both atomic and electronic origin. The stability of the (Pd-Ni)(sub 80)P(sub 20) BMGs can be explained in terms of the stability of Pd(sub 60)Ni(sub 20)P(sub 20) and Pd(sub 30)Ni(sub 50)P(sub 20), glasses at the end of BMG formation. The atomic structure in these alloys is very similar to those of the binary phosphide crystals near x=0 and x=80, which are trigonal prisms of Pd or Ni atoms surrounding P atoms.