Unidirectional solidification of Zn-rich Zn-Cu peritectic alloys -- I. Microstructure selection

Journal Article · Mon Jan 24 04:00:00 EST 2000 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(99)00365-1· OSTI ID:20015248

Ma, D; Li, Y; Ng, S C; Jones, H

A solidification microstructure selection diagram has been determined for Zn-rich Zn-Cu peritectic alloys containing up to 7.37 wt% Cu over the growth velocity range 0.02--4.82 mm/s and at a temperature gradient of 15 K/mm by means of the Bridgman technique. Regular and plate-like cellular growth was observed in a range of composition near the peritectic point at growth velocities above 0.5 mm/s. the minimum growth velocity for the formation of plate-like cellular growth was about 2.64 mm/s in the compositional range from 2.17 to 4.94 wt% Cu. Two transitions, namely, arrayed to nonaligned growth of primary dendrites increased with increasing alloy concentration, which is consistent with the prediction of a modified Hunt model. The transition growth velocity from peritectic to non-peritectic reaction exhibited a maximum near the peritectic composition.

• Research Organization: National Univ. of Singapore (SG)
• OSTI ID: 20015248
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 2 Vol. 48; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BRIDGMAN METHOD
CONCENTRATION RATIO
COPPER ALLOYS
CRYSTAL-PHASE TRANSFORMATIONS
DENDRITES
MICROSTRUCTURE
SOLIDIFICATION
ZINC ALLOYS