Microstructures and thermal stability of metastable-phase precipitates formed in an Al–Cu alloy at 463 K | Zendy

Sungkyu Son | Zendy; M. Takeda | Zendy; T. Endo | Zendy

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Microstructures and thermal stability of metastable-phase precipitates formed in an Al–Cu alloy at 463 K

Author(s) -

Sungkyu Son,

M. Takeda,

T. Endo

Publication year - 2005

Publication title -

zeitschrift für metallkunde

Language(s) - English

Resource type - Journals

ISSN - 0044-3093

DOI - 10.3139/146.018117

Subject(s) - alloy , microstructure , metastability , materials science , metallurgy , thermal stability , phase (matter) , precipitation , chemistry , physics , organic chemistry , meteorology

The precipitation behavior in an Al–Cu alloy isothermally annealed at 463 K was studied using Vickers microhardness tests, differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). An additional endothermic peak found in the DSC measurements may be attributed to the θ”-phase, independent of the dissolution of the G. P. (II) and the θ-phase at the aging temperatures. High-resolution transmission electron microscopy (HRTEM) revealed that the G. P. (I) is formed at a very early stage of isothermal aging, even at 463 K. Comparing the Vickers microhardness and TEM images, it was concluded that the stage at which the G. P. (II) and θ-phases precipitated simultaneously is mainly responsible for the peak hardness.

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