Release Time:2019-10-19  Hits:

Indexed by: Journal Article

Date of Publication: 2019-01-02

Journal: MATERIALS SCIENCE AND TECHNOLOGY

Included Journals: EI、SCIE

Volume: 35

Issue: 1

Page Number: 98-106

ISSN: 0267-0836

Key Words: Cu-Ni-Mo alloys; strengthening mechanism; precipitates; microstructure

Abstract: Mo could be dissolved into Cu to increase its high-temperature stability via a Ni intermediate. The microstructure evolution and strengthening mechanism of Cu-x[Ni3Mo] (x = 1, 2, 3, 4, 5, 7, 9, 12) alloys were investigated. The results show that composition significantly affects strengthening mechanisms of the alloys. For x = 1 and 2, The strengthening mechanisms of the alloys are mainly precipitation strengthening derived from Ni2Mo and Ni4Mo nanophases, both of which coexist and coherently grow on the face-centered cubic matrix. For x = 3-5, the nanophases gradually decrease and spinodal decomposition structure increases, which transforms the strengthening mechanism to spinodal decomposition strengthening. For x = 7-12, spinodal decomposition structure and precipitates reduce significantly, the solution strengthening dominates namely.