| Title |
Effect of Additions of Al, Ti, Si and Sb on the Mechanical Properties of Cu-9Ni-6Sn Alloys |
| Authors |
정윤철(Yun Chul Jung); 한승전(Seung Zeon Han); 이정무(Jung Moo Lee); 김창주(Chang Joo Kim) |
| Keywords |
Cu-9Ni-6Sn alloy; Spinodal decomposition; Metastable phase; Precipitation; Discontinuous precipitate; Tensile strength; Elongation. Electrical resistivity |
| Abstract |
The effects of additions of Al, Ti, Si and Sb on the mechanical properties, electrical resistivity and formation of discontinuous precipitate in Cu-9Ni-6Sn(wt%) alloy have been investigated. The physical and mechanical properties of the Cu-9Ni-6Sn alloy were strongly dependent on aging conditions. This alloy was much strengthened by aging at temperatures below 350℃ where the spinodal decomposition occurs, but the specimen does not be strengthened by aging at temperatures above 400℃ where the discontinuous precipitate forms. Al suppressed the formation of discontinuous precipitation and increased the electrical resistivity. The nucleation of discontinuous precipitate was significantly retarded by the small additions of Ti and Si and the discontinuous product has never formed up to 5h even at 450℃. The addition of Sb. on the other hand, was not affected markedly. In all of the alloys examined, the electrical resistivity was decreased by aging and the degree of reduction increased with increasing aging temperature and aging time. |