Nonequilibrium Partitioning During Rapid Solidification of Si-As Alloys

DSpace/Manakin Repository

Nonequilibrium Partitioning During Rapid Solidification of Si-As Alloys

Citable link to this page

. . . . . .

Title: Nonequilibrium Partitioning During Rapid Solidification of Si-As Alloys
Author: Aziz, Michael; Thompson, M. O.; Brunco, David P.; Kittl, Jorge A.

Note: Order does not necessarily reflect citation order of authors.

Citation: Kittl, Jorge A., Michael J. Aziz, David P. Brunco, and M. O. Thompson. 1995. Nonequilibrium partitioning during rapid solidification of Si-As alloys. Journal of Crystal Growth 148, no. 1-2: 172-182.
Access Status: At the direction of the depositing author this work is not currently accessible through DASH.
Full Text & Related Files:
Abstract: The velocity dependence of the partition coefficient was measured for rapid solidification of polycrystalline Si-4.5 at% As and Si-9 at% As alloys induced by pulsed laser melting. The results constitute the first test of partitioning models both for the high velocity regime and for non-dilute alloys. The continuous growth model (CGM) of Aziz and Kaplan fits the data well, but with an unusually low diffusive speed of 0.46 m/s. The data show negligible dependence of partitioning on concentration, also consistent with the CGM. The predictions of the Hillert-Sundman model are inconsistent with partitioning results. Using the aperiodic stepwise growth model (ASGM) of Goldman and Aziz, an average over crystallographic orientations with parameters from independent single-crystal experiments is shown to be reasonably consistent with these polycrystalline partitioning results. The results, combined with others, indicate that the CGM without solute drag and its extension to lateral ledge motion, the ASGM, are the only models that fit the data for both solute partioning and kinetic undercooling interface response functions. No current solute drag models can match both partitioning and undercooling measurements.
Published Version: http://dx.doi.org/10.1016/0022-0248(94)00836-1
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:3108808

Show full Dublin Core record

This item appears in the following Collection(s)

  • FAS Scholarly Articles [6463]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University
 
 

Search DASH


Advanced Search
 
 

Submitters