Fcc nanostructured TiFeCoNi alloy with multi-scale grains and enhanced plasticity

SCRIPTA MATERIALIA

卷:143

Article

Fu, Zhiqiang^1,2  MacDonald, Benjamin E.¹  Zhang, Dalong¹  Wu, Bingyong²  Chen, Weiping²  Ivanisenko, Julia³  Hahn, Horst³  Lavernia, Enrique J.¹ 

[1] Univ Calif Irvine, Dept Chem Engn & Mat Sci, Irvine, CA 92697 USA

[2] South China Univ Technol, Guangdong Key Lab Adv Metall Mat Proc, Guangzhou 510640, Guangdong, Peoples R China

[3] KIT, Inst Nanotechnol, D-76021 Karlsruhe, Germany

关键词: High-entropy alloys;    Multi-scale grains;    Mechanical properties;   

DOI  :  10.1016/j.scriptamat.2017.09.023

来源: Elsevier

【 摘 要 】

Face-centered cubic (fcc) nanostructured high entropy alloys (HEAs) are characterized by high strength and low plasticity. The objective of the present study was to investigate the question of whether it is possible to increase plasticity while retaining strength in a medium-entropy TiFeCoNi alloy by promoting the formation of a multi scale microstructure. To accomplish this objective we synthesized a bulk Ti(10)Fe(30)Co(3)oNi(30) medium-entropy alloy (MEA) via mechanical alloying (MA) and spark plasma sintering (SPS). This synthesis approach yielded a multi-scale microstructure consisting of distinctly coarse grains (> 1 mu m) and nanosized grains. The mechanisms responsible for the associated mechanical behavior are discussed. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free