Effect of heat treatment on microstructure and mechanical properties of Cu–6.9Ni–2.97Al–0.99Fe–1.06Mn alloy. Issue 1 (2nd January 2020)

• Record Type: Journal Article
• Authors: Yang, Ran; Wen, Jiuba; Zhou, Yanjun; Song, Kexing; Niu, Liye; Guo, Huiwen; Yu, Yan
• Is Part Of: Materials science and technology. Volume 36:Issue 1(2020)
• Page Start: 83
• Page End: 91
• Publication Date: 2020-01-02
• Subjects: Cu–6.9Ni–2.97Al–0.99Fe–1.06Mn alloy -- heat treatment -- microstructure evolution -- mechanical property -- Copper alloy; Materials science -- Periodicals; Microstructure -- Periodicals; Metallurgy -- Periodicals; 620.1105
• DOI: 10.1080/02670836.2019.1684035
• Languages: English
• ISSNs: 0267-0836

Abstract

ABSTRACT: The effect of heat treatment on the mechanical properties and microstructures of Cu–6.9Ni–2.97Al–0.99Fe–1.06Mn alloys was investigated. The results show that the microstructure of the as-cast alloy mainly consists of an alpha-copper matrix and γ-phase Ni3 Al particles. The microstructure of the alloy after solution treatment at 950°C for 2 h is a single-phase alpha-copper supersaturated solid solution and the second-phase strengthening disappears. After ageing treatment at 550°C for 6 h, the γ-phase particles are fully precipitated, and the mechanical properties of the alloy are significantly improved. The tensile strength is increased from 305 to 588 MPa. Quasi-cleavage fracture with shallow dimples appeared in the Cu–6.9Ni–2.97Al–0.99Fe–1.06Mn alloy aged at 550°C for 6 h.