Xuanjiang Lai , Yaojia Ren , Qingge Wang , Shaohua Xing , Cheng Xu , Jian Hou , Ian Baker , Hong Wu
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引用次数: 0
Abstract
An AlCoCuFeTi high-entropy alloy with excellent wear resistance and high hardness was successfully produced by arc melting. The effects of annealing on the microstructure, nanomechanical behaviors, tribological properties, and corrosion resistance were systematically investigated. The results showed that the AlCoCuFeTi consisted of a Co-enriched L21 phase, a Cu-enriched FCC phase, and a (Fe, Ti)-enriched Laves phase. Annealing promoted the formation of FCC and Laves phases but decreased the volume fraction of the L21 phase. The high hardness of AlCoCuFeTi is attributed to the formation of L21 and Laves phases. The highest hardness (14.1 ± 1.3 GPa) and reduced Young's modulus (256 ± 11 GPa) were achieved in the 1100 °C annealed and 900 °C annealed specimens, respectively. All specimens exhibited excellent wear resistance compared to typical HEAs due to the mild-oxidational wear mechanism. The 1100 °C annealed specimen possessed the highest elastic strain to failure (H/Er) and yield pressure (H3/Er2), corresponding to its best-measured wear resistance. The segregation of Cu led to galvanic corrosion during the polarization tests, and the area ratio of cathode to anode (Ac/Aa) determined the corrosion rate. The 1100 °C annealed specimen exhibited good corrosion resistance due to its low Ac/Aa value.
期刊介绍:
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