Investigation on an anti-corrosion Cu-rich multiple-principal-element alloy strengthened and toughened by nano-scaled L12-type ordered particles

作者：Jin, Chengyan; Du, Xinghao^*; Li, Wanpeng; Chen, Wenyu; Yan, Fei; Shi, Chuanxin; Chou, Tzu-Hsiu; Chih-Ching Huang, Jacob

来源：International Journal of Materials Research, 2022, 113(7): 663-670.

DOI：10.1515/ijmr-2021-8677

• Anti-corrosion properties
• Cu-rich multiple-principal-element alloy
• Mechanical properties
• Microstructure
• Precipitation strengthening

In this study, the microstructure and mechanical properties of a Cu-rich multiple-principal-element alloy with the composition (Cu50Ni20Cr20Mn10)(95)Al-5 (at.%) were investigated. It was found that after 900 degrees C/1 h annealing process, the as-cast alloy has achieved promising mechanical properties with a yield stress of 510 MPa, an ultimate tensile stress of 820 MPa and tensile elongation of 30 %. These properties are superior to those of traditional nickel-aluminum bronze (NAB) alloys. Moreover, the as-annealed alloy exhibited much better anti-corrosion properties with respect to the NBA alloys. Transmission electron microscopy observations showed that high-number-density nano-scaled L1(2)-type ordered particles have precipitated in the Cu-rich phase after heat treatment and this was regarded as the main mechanism responsible for the enhancement of yield stress.