Accession Number:

ADA550866

Title:

An Assessment of Binary Metallic Glasses: Correlations Between Structure, Glass Forming Ability and Stability (Preprint)

Descriptive Note:

Journal article preprint

Corporate Author:

AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIR METALS CERAMICS AND NONDESTRUCTIVE EVALUATION DIV/METALS BRANCH

Report Date:

2011-07-01

Pagination or Media Count:

97.0

Abstract:

This manuscript explores the influence of atomic structure on glass-forming ability and thermal stability in binary metallic glasses. A critical assessment gives literature data for 629 alloys from 175 binary glass systems. The atomic structure is quantified for each alloy using the efficient cluster-packing model. Comparison of atomic structure with amorphous thickness and thermal stability gives the following major results. Binary glasses show a strong preference for discrete solute-to-solvent atomic radius ratios, R, that give efficient local atomic packing. Of fifteen possible R values, only five are common and only four represent the most stable glasses. The most stable binary glasses are also typically solute-rich, with enough solute atoms, alpha, to fill all the solute sites and roughly 113 of the solvent sites. This suggests that anti-site defects, where solutes occupy solvent atom sites, are important in the glass-forming ability of the most stable glasses. This stabilizing effect results from an increase in the number of more stable solute-solvent bonds in solute-rich glasses.

Subject Categories:

  • Metallurgy and Metallography
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE