In:
High Temperature Materials and Processes, Walter de Gruyter GmbH, Vol. 33, No. 1 ( 2014-02-1), p. 85-94
Abstract:
The microstructure evolution of aluminum alloy 2618 and its homogenization kinetics were investigated by optical microscope, scanning electron microscope, energy dispersive spectroscopy and differential scanning calorimeter. The results show that the main constituent phases in as-cast alloy 2618 are α–Al, Al 9 FeNi phase and non-equilibrium binary θ (Al 2 Cu) phase instead of typical S (Al 2 CuMg) phase. The θ phase was dissolved into α–Al gradually and the continuous dendritic-network structure was broken with the increase of homogenization temperature and time. DSC analysis shows that the overburnt and liquidus temperatures of as-cast alloy 2618 are 506.4 °C and 638.0 °C, respectively. After the alloy was homogenized at optimized temperature 500 °C for 16 h, the θ phase was completely dissolved in matrix. The size and morphology of Al 9 FeNi phase had little change, while the liquidus temperature shifted to 641 °C. The calculated homogenization time for alloy 2618 at 500 °C is 15 h, which is in accordance with that obtained in homogenization experiments.
Type of Medium:
Online Resource
ISSN:
2191-0324
,
0334-6455
DOI:
10.1515/htmp-2013-0029
Language:
Unknown
Publisher:
Walter de Gruyter GmbH
Publication Date:
2014
detail.hit.zdb_id:
2602423-8
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