10.1007_s11661-003-0080-6.pdf (2.87 MB)
Download file

A Study of Microsegregation in Al-Cu Using a Novel Single-Pan Scanning Calorimeter

Download (2.87 MB)
journal contribution
posted on 08.12.2009, 16:16 by Hongbiao Dong, M. R. M. Shin, E. C. Kurum, J. D. Hunt, H. Cama
A single-pan scanning calorimeter has been developed that eliminates the smearing of latent heat that occurs in a conventional two-pan heat-flux differential scanning calorimeter (DSC). In the new calorimeter, accurate enthalpy/temperature data was obtained in pure Al without smearing, and excellent sensitivity to new phases was obtained in a multicomponent Al alloy (LM25). The calorimeter has been used to investigate microsegregation in an Al-4.45 wt pct Cu alloy. The enthalpy/temperature data fell between that calculated, assuming no mixing in the solid (Scheil) and complete mixing in the solid (equilibrium solidification). The amount of segregation agreed well with that calculated using a diffusion-based model of microsegregation. The difficulty of getting the fraction solid from the enthalpy data is discussed, and it is concluded that it is not possible to do so without using a microsegregation model. In addition, it is concluded that it is wrong to assume that the enthalpy of an alloy can be given by a specific heat term and a constant latent heat term that depend on fraction liquid as is assumed in most casting models. [This article is based on a presentation given in the symposium “Fundamentals of Solidification,” which occurred at the TMS Fall meeting in Indianapolis, Indiana, November 4–8, 2001, under the auspices of the TMS Solidification Committee.]

History

Citation

Metallurgical and Materials Transactions A, 2003, 34 (3), pp.441-447

Version

VoR (Version of Record)

Published in

Metallurgical and Materials Transactions A

Publisher

Springer Verlag on behalf of ASM International

issn

1073-5623

eissn

1543-1940

Copyright date

2003

Available date

08/12/2009

Publisher version

http://link.springer.com/article/10.1007/s11661-003-0080-6

Notes

This paper was published in Metallurgical and Materials Transactions A, 2003, Volume 34. Issue 3, pp.441-447 and is made available as an electronic reprint with the permission of ASM International. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplications of any material in this paper for a fee or for commercial purposes, or modification of the content of this paper are prohibited.

Language

en

Usage metrics

Categories

Keywords

Exports