Microstructure and tensile behaviors of FCC Al0.3CoCrFeNi high entropy alloy

作者：Shun Tao Tsung^*; Du Yu Chin

来源：Journal of Alloys and Compounds, 2009, 479(1-2): 157-160.

DOI：10.1016/j.jallcom.2008.12.088

• Casting
• Precipitation
• Scanning and transmission electron microscopy
• Strain

Homogeneously spherical nanoprecipitates with a L1(2) ordered structure are observed in as-cast FCC Al0.3CoCrFeNi high entropy alloy, while their morphology changes to platelets after aging at 700 degrees C. The appearance of a yield drop and low work-hardening during tension reveals that these nanoprecipitates are coherent and have the characteristics of the Guinier-Preston zone. The 900 degrees C aged alloy displays micro-sized rod-shaped precipitates rich in Ni and Al instead of nanoprecipitates. There is no yield drop but high work-hardening occurs during tension. This rod-shaped phase has a B2 ordered structure and has the Kurdiumov-Sachs relationship with the FCC matrix.

• 出版日期2009-6-24