Accession Number:

ADA550867

Title:

Structure of Ca-Mg-Zn Metallic Glasses (Preprint)

Descriptive Note:

Journal article preprint

Corporate Author:

UES INC DAYTON OH

Report Date:

2011-07-01

Pagination or Media Count:

45.0

Abstract:

The amorphous structure of four Ca60MgXZn40-X alloys X 10, 15, 20, and 25 at. has been modeled using a set of experimental neutron and X-ray scattering data, peak fit analysis, and Reverse Monte Carlo RMC simulation. The amorphous structure can be described as a mixture of Mg- and Zn- centered clusters, with Ca dominating in the first coordination shell of these clusters. The coordination number CN of 10 with about 7 Ca and 3 MgZn atoms is the most common for the Zn-centered clusters. CN 11 and 12 with about 7-8 Ca and 4 MgZn atoms are the most common for the Mg-centered clusters. Fife-fold bond configurations pentagonal pyramids dominate 60 in the first coordination shell of the clusters, suggesting densely atomic packing. Bond angle distributions suggest the near-equilateral triangles and pentagonal pyramids to be the most common nearest atom configurations. Two Ca-Mg-Zn alloys with inferior GFA have increased amounts of 0,0,12,0, 0,2,8,1, 0,2,8,2 and 0,4,4,3 clusters, which suggests that these clusters may facilitate crystallization.

Subject Categories:

  • Metallurgy and Metallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE