Effect of heat treatment on microstructure and mechanical properties of Cu–6.9Ni–2.97Al–0.99Fe–1.06Mn alloy

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 Ni₃Al 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.

KEYWORDS:

• Cu–6.9Ni–2.97Al–0.99Fe–1.06Mn alloy
• heat treatment
• microstructure evolution
• mechanical property
• Copper alloy

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

Ran Yang http://orcid.org/0000-0002-3464-7852

Jiuba Wen http://orcid.org/0000-0001-5397-1677

Additional information

Funding

This work was supported by the National Key Research and Development Program of China under grant number 2016YFB0301400, the Collaborative Innovation Center of Nonferrous Metals Henan Province, the Henan Key Laboratory of Advanced Non-Ferrous of Metals.