Accession Number:

ADA046296

Title:

On the Gram-Atomic Volumes of Metal-Metalloid Glass Forming Alloys.

Descriptive Note:

Interim rept.,

Corporate Author:

HARVARD UNIV CAMBRIDGE MA DIV OF APPLIED SCIENCES

Personal Author(s):

Report Date:

1977-09-01

Pagination or Media Count:

20.0

Abstract:

A large number of alloy glasses are composed by combining late transition elements A with certain metalloids B, such as Si, P, C, Ge, B, in ratios ranging roughly from A5B, to A3B. This range usually includes a composition, near A4B, at which the system exhibits an extraordinarily deep eutectic. The actual glass temperatures, Tg, vary only slowly with composition around this eutectic thus, the reduced glass temperature, T sub rg T sub lT sub g, where T sub l is the liquidus temperature, will be at or near maximum at the eutectic. The existing thermal measurements indicate that substantial heat is evolved when the alloys form from the pure metallic liquid states of A and B and that considerable short range compositional order develops as the alloy melts are cooled to T sub g.

Subject Categories:

  • Ceramics, Refractories and Glass
  • Metallurgy and Metallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE