材料科学
合金
退火(玻璃)
化学计量学
高熵合金
降水
结晶学
立方晶系
熵(时间箭头)
热力学
冶金
物理化学
化学
物理
气象学
作者
Bharat Gwalani,Vishal Soni,Deep Choudhuri,M. Lee,Jun Yeon Hwang,Sangwook Nam,Ho Jin Ryu,Soon Hyung Hong,Rajarshi Banerjee
标识
DOI:10.1016/j.scriptamat.2016.06.019
摘要
Adding a small amount of Al to the well-known high entropy alloy (HEA), Al0.1CoCrFeNi, to form Al0.3CoCrFeNi, leads to the precipitation of highly refined ordered L12 precipitates, which are stable at 550 °C. However, the L12 precipitates (stoichiometry of (Ni,Cr)3(Al,Fe,Co)) are de-stabilized and replaced by coarser B2 precipitates on annealing at 700 °C. Contrastingly, in the Co-free, Al0.3CuCrFeNi2 high entropy alloy, the L12 precipitates are stable at both 550 °C (~ 5 nm) and 700 °C (~ 50 nm), and exhibit a stoichiometry of (Ni,Cu)3(Al,Fe,Cr). These results lead to interesting insights into the stability of ordered phases in HEAs as a function of composition and temperature.
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