期刊
METALS
卷 9, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/met9050485
关键词
high-entropy alloy; cold-rolling; annealing; ductility; nano-precipitation particle
资金
- National Key Basic Research Program from MOST [2015CB856800]
- National Natural Science Foundation of China [51761135125, 51671120]
- Materials Genome Engineering of Rare and Precious Metals in Yunnan [2018ZE007]
- 111 project [D16002]
A NbTiHfZr high-entropy alloy (HEA) with a main phase of body-centered cubic structure is fabricated. Some hexagonal closed-packed (hcp) precipitates are observed in this alloy. A thermal-mechanical process, i.e., cold-rolling followed by annealing, can manipulate the volume fraction of the hcp nano-precipitates that can enhance strength and ductility. The enhancement is tailorable as a function of the volume fraction of the hcp nano-precipitate. The results indicate that the strength-ductility property can be manipulated via adjusting post-deformation heat-treatment methods, which provide a new strategy by utilizing metastability at high-temperature to design high strength refractory HEAs (RHEAs) without lost in ductility.
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