Patent ID: 11959161
Assignee: TOHOKU UNIVERSITY
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 3:
4. A copper-based alloy material comprising a multiphase structure comprising a matrix of a β phase and a precipitation phase of a B2 crystal structure dispersed in the matrix, wherein the copper-based alloy material comprises a composition comprising 8.6 to 12.6% by mass of Al, 2.9 to 8.9% by mass of Mn, 3.2 to 10.0% by mass of Ni, and Cu, and the matrix includes a L21 crystal structure, wherein when loading and unloading of a stress applying a 3% strain to the alloy material is repeated, a number of times the loading and unloading is repeated until the alloy material is fractured is equal to or greater than 1000.