A complex structure in the (β+γ0) region of the Cu–Al alloys

• Published in: Journal of alloys and compounds Vol. 280; no. 1-2; pp. 188 - 195
• Main Authors: Hurtado, M.R.F, Portillo, J, Maniette, Yves, Adorno, A.T, Benedetti, A.V
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 23.10.1998; Elsevier
• Subjects: (β+γ0) region; Applied sciences; Cross-disciplinary physics: materials science; rheology; Cu–Al alloys; Exact sciences and technology; Materials science; Metallography; Metals. Metallurgy; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Phase diagrams of metals and alloys; Physics; TEM studies; Cu–Al alloys; Metallography; (β+γ0) region; TEM studies; Temperature dependence; Electron diffraction; Copper base alloys; XRD; Phase analysis; Experimental study; AES; DTA; Binary alloys; Optical microscopy; Aluminium alloys; SEM; Microstructure; TEM; Transition element alloys
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/S0925-8388(98)00729-4

The identification, characterization and stability range of the phases present in a series of Cu–Al alloys, with Al content from 11.0 to 15.0 wt.%, were studied by Differential Thermal Analysis (DTA), Optical Microscopy (OM), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Selected Area Electron Diffraction (SAED), Auger Electron Spectroscopy (AES), Energy Dispersive X-Ray Spectroscopy (EDX) and X-Ray Diffraction (XRD). In some alloys and in a temperature range from 790°C to 850°C the presence of black spots exhibiting regular shapes and an homogeneous distribution was noticed through metallographic microscopy. Data from TEM and AES indicate that these spots are made of two monocrystalline phases having different Al contents and a crystallographic orientation relationship.