Preparing bulk ultrafine-microstructure high-entropy alloys: Via direct solidification
Artikel i vetenskaplig tidskrift, 2018

In the past three decades, nanostructured (NS) and ultrafine-microstructure (UFM) materials have received extensive attention due to their excellent mechanical properties such as high strength. However, preparing low-cost and bulk NS and UFM materials remains to be a challenge, which limits their industrial applications. Here, we report a new strategy to prepare bulk UFM alloys via the direct solidification of high-entropy alloys (HEAs). As a proof of concept, we designed AlCoCr x FeNi (1.8 ≤ x ≤ 2.0) HEAs and achieved a complete UFM in bulk materials. The compositional requirements for obtaining the formation of the UFM are highly demanding, necessitating the coupling of near eutectic alloy composition and the high temperature decomposition of supersaturated primary and secondary phases. Our strategy provides a low-cost and highly efficient method to prepare bulk UFM alloys, with great potential to accelerate the engineering application of these materials.

Författare

Yiping Lu

Dalian University of Technology

Xiaoxia Gao

Dalian University of Technology

Yong Dong

Dalian University of Technology

Tongmin Wang

Dalian University of Technology

Hai Lin Chen

Thermo-Calc Software AB

H. H. Mao

Kungliga Tekniska Högskolan (KTH)

Yonghao Zhao

Nanjing University of Science and Technology

Hui Jiang

Dalian University of Technology

Zhiqiang Cao

Dalian University of Technology

Tingju Li

Dalian University of Technology

Sheng Guo

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Nanoscale

2040-3364 (ISSN)

Vol. 10 4 1912-1919

Ämneskategorier

Bearbetnings-, yt- och fogningsteknik

Övrig annan teknik

Annan materialteknik

DOI

10.1039/c7nr07281c