| Title |
Effect of Mn Addition on the Phase Transformation and Mechanical Properties in Cu-Ni-Sn Alloy |
| Authors |
한승전(Seung Zeon Han),김창주(Chang Joo Kim),이정무(Jung Moo Lee),정윤철(Yun Chul Jung) |
| Abstract |
The effects of Mn addition on phase transformation behavior and mechanical properties of Cu-(9-x)Ni-xMn-6Sn alloys were investigated. The microstructure and transformation behavior changed with increasing Mn content and heating temperature. The Mn free alloy decomposed spinodally by aging at 350℃ and followed by formation of a metastable γ′ phase which accompanies the increase of mechanical characteristics with increasing Mn content, however, the γ′ phase disappeared and a stable γ phase was dominantly precipitated. When the specimens were aged above 450℃, equilibrium γ phase formed from the initial stage of transformation without any reaction such as spinodal decomposition and transformation of a metastable phase. Therefore, addition of Mn and increasing heating temperature suppressed the hardening effect of alloy in the early stage of aging, and decreased the tensile strength. |