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Indexed by:Journal Papers

Date of Publication:2019-11-01

Journal:MATERIALS RESEARCH EXPRESS

Included Journals:EI、SCIE

Volume:6

Issue:11

ISSN No.:2053-1591

Key Words:Cu-Zn alloys; cryogenic rolling; precipitates; strength; ductility

Abstract:In the present study, the Cu-30Zn alloy was selected as the experimental material, the Ni and Si elements were added to prepare a new Cu-30Zn-1Ni-0.2Si alloy. The two alloys subjected to cryogenic rolling were annealed at 300 degrees C for different times. Their mechanical, structural, and electrical properties have been characterized. The results revealed that the strength of Cu-30Zn alloy decreases severely after annealing, but the Cu-30Zn-1Ni-0.2Si alloy maintains a high strength due to the generation of Ni2Si precipitates. For example, the average tensile strength of the as-rolled Cu-30Zn alloy is 711.3 MPa, while it reduces to 562.3 MPa and 546.7 MPa after annealing for 1 h and 2 h. In contrast, the average tensile strength of the as-rolled Cu-30Zn-1Ni-0.2Si alloy is 742.5 MPa, it can be enhanced to 768.4 MPa when annealing at 300 degrees C for 1 h. Moreover, even prolonging the annealing time to 2 h, the average strength is still 701.3 MPa which is close to that of the as-rolled Cu-30Zn alloy. This study provided a feasible strategy to solve the exclusion of strength and ductility in the Cu-30Zn alloy fabricated through cryogenic rolling followed by annealing, and it may also be suitable for other Cu-Zn alloys and solid solution strengthening alloys.