Details

Autor(en) / Beteiligte

• Fu, Zhiqiang
• Jiang, Lin
• Wardini, Jenna L
• MacDonald, Benjamin E
• Wen, Haiming
• Xiong, Wei
• Zhang, Dalong
• Zhou, Yizhang
• Rupert, Timothy J
• Chen, Weiping
• Lavernia, Enrique J

Titel

A high-entropy alloy with hierarchical nanoprecipitates and ultrahigh strength

Ist Teil von

• Science advances, 2018-10, Vol.4 (10), p.eaat8712-eaat8712

Ort / Verlag

United States: American Association for the Advancement of Science

Erscheinungsjahr

2018

Quelle

The Electronic Journals Library

Beschreibungen/Notizen

• High-entropy alloys (HEAs) are a class of metallic materials that have revolutionized alloy design. They are known for their high compressive strengths, often greater than 1 GPa; however, the tensile strengths of most reported HEAs are limited. Here, we report a strategy for the design and fabrication of HEAs that can achieve ultrahigh tensile strengths. The proposed strategy involves the introduction of a high density of hierarchical intragranular nanoprecipitates. To establish the validity of this strategy, we designed and fabricated a bulk Fe Co Ni Al Ti HEA to consist of a principal face-centered cubic (fcc) phase containing hierarchical intragranular nanoprecipitates. Our results show that precipitation strengthening, as one of the main strengthening mechanisms, contributes to a tensile yield strength (σ ) of ~1.86 GPa and an ultimate tensile strength of ~2.52 GPa at room temperature, which heretofore represents the highest strength reported for an HEA with an appreciable failure strain of ~5.2%.