Role of diffusion in amorphous-phase formation and crystallization of amorphous Ni--Zr

Journal Article · Sun Mar 01 00:00:00 EST 1987 · J. Mat. Res.; (United States)

DOI:https://doi.org/10.1557/JMR.1987.0168· OSTI ID:6953142

Barbour, J C; de Reus, R; Saris, F W

The Ni--Zr system is examined as a representative system for the formation of an amorphous phase by diffusion and for the crystallization of an amorphous phase by diffusion. High-resolution electron microscopy (HREM) is used to show that the amorphous phase grows by bulk diffusion through the amorphous material rather than by short-circuit diffusion. Also, the HREM shows that the amorphous phase formed by diffusion appears to be the same as the vapor-deposited amorphous phase. A correlation between crystallization temperatures (T/sub x/) and the enthalpy of large-atom hole formation is given. This correlation predicts values of T/sub x/ that are lower than those predicted from the small-atom hole-formation model. The difference in hole-formation enthalpies for the large and small atoms is given as a criterion for amorphous-phase formation via diffusion.

• Research Organization: FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands
• OSTI ID: 6953142
• Journal Information: J. Mat. Res.; (United States), Vol. 2:2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NICKEL ALLOYS
CRYSTALLIZATION
SELF-DIFFUSION
ZIRCONIUM ALLOYS
AMORPHOUS STATE
ELECTRON MICROSCOPY
ENTHALPY
ALLOYS
DIFFUSION
MICROSCOPY
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
360102* - Metals & Alloys- Structure & Phase Studies