Dynamic precipitation at elevated temperatures in a dual-phase AlCoCrFeNi high-entropy alloy : an in situ study

• The effect of a possible phase transformation or precipitation of the face-centred cubic (FCC) phase on intermediate-temperature deformation of a dual-phase AlCoCrFeNi high-entropy alloy has been studied using in situ tensile testing at 550°C. Electron backscatter diffraction (EBSD) results showed localised precipitation of the FCC phase during the intermediate-temperature deformation. The overall fracture behaviour and crack propagation of the material was not altered much compared to the room-temperature behaviour, namely brittle trans-granular fracture. Deformation at higher temperatures (above 750°C) is suggested as a way to enhance the dynamic FCC phase precipitation, in order to improve the ductility or deformability of the alloy. 

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Materialteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering (hsv//eng)

Keyword

AlCoCrFeNi

crack propagation

EBSD

fracture

precipitation

Aluminum alloys

Chromium alloys

Cobalt alloys

Cracks

Deformation

Entropy

Iron alloys

Metal testing

Tensile testing

Dynamic precipitation

Electron back scatter diffraction

Elevated temperature

High entropy alloys

In-situ tensile testing

Intermediate temperatures

Precipitation (chemical)

Publication and Content Type

ref (subject category)

art (subject category)