材料科学
共晶体系
退火(玻璃)
微观结构
浇注性
高熵合金
冶金
抗压强度
合金
复合材料
作者
Lingkun Zhang,Rui Huang,Abdukadir Amar,Xiaohu Chen,Zheng Ren,Tao He,Yiping Lu
标识
DOI:10.1002/adem.202201659
摘要
Eutectic high-entropy alloys (EHEAs), with good castability, compositional homogeneity, and outstanding properties, are becoming hotpots in materials field. It is worth noting that most reported EHEAs are based on expensive and high density of metal elements, such as Hf, Zr, Ta, Nb, W, and Pd, which increase the overall cost and quality. Herein, by selecting the cost-effective and low-density of Ti and Si as eutectic forming elements, a novel CoCrFeNi2(TiSi)0.7 EHEA with face-centered-cubic (FCC) + M16Ti6Si7-type silicide is designed and prepared. The evolution of microstructure and mechanical properties is investigated under different annealing conditions. The CoCrFeNi2(TiSi)0.7 EHEA shows excellent high-temperature mechanical properties. At 800 °C, the as-cast and annealed samples do not fracture under a compressive strain exceeding 50%. In particular, a long period of high-temperature annealing dramatically increases the high-temperature yield strength from 510 to 703 MPa, which exceeds that of most reported EHEAs and some refractory high-entropy alloys.
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