The dissolution behavior of θ′ phase in Al–Cu binary alloy during equal channel angular pressing and multi-axial compression

The dissolution behavior of θ′ phase in Al–Cu binary alloy during equal channel angular pressing (ECAP) and multi-axial compression (MAC) was characterized by hardness test, small angle X-ray scattering method and TEM observation. Results suggested that the θ′ phase in the MAC-processed sample dissolved more rapidly than that in the ECAP-processed sample, which was attributed to the difference in the stress state between ECAP and MAC processing.