Dendrite coherency of Al-Si-Cu alloys


Autoria(s): Veldman, N. L. M.; Dahle, A. K.; St John, D. H.; Arnberg, L.
Data(s)

01/01/2001

Resumo

The dendrite coherency point of Al-Si-Cu alloys was determined by thermal analysis and rheological measurement methods by performing parallel measurements at two cooling rates for aluminum alloys across a wide range of silicon and copper contents. Contrary to previous findings, the two methods yield significantly different values for the fraction solid at the dendrite coherency point. This disparity is greatest for alloys of low solute concentration. The results from this study also contradict previously reported tl ends in the effect of cooling rate on the dendritic coherency point. Consideration of the results shows that thermal analysis is not a valid technique for the measurement of coherency. Analysis of the results from rheological testing indicates that silicon concentration has a dominant effect on grain size and dendritic morphology, independent of cooling rate and copper content, and thus is the factor that determines the fraction solid at dendrite coherency for Al-Si-Cu alloys.

Identificador

http://espace.library.uq.edu.au/view/UQ:37029

Idioma(s)

eng

Publicador

Minerals Metals Materials Soc

Palavras-Chave #Materials Science, Multidisciplinary #Metallurgy & Metallurgical Engineering #Equiaxed Solidification #Aluminum-alloys #Elements #Growth #291403 Alloy Materials #091207 Metals and Alloy Materials
Tipo

Journal Article