Effects of grain size and texture on damping properties of Cu–Al–Mn-based shape memory alloys

Effects of grain size and texture on the damping properties in the Cu–Al–Mn-based shape memory alloys were investigated mainly by dynamic mechanical spectrometry. Dynamic damping tan ϕ obtained from the martensite single-phase specimens increases with increasing relative grain size d/t, where d and t indicate the grain size and the specimen sheet thickness, respectively. Moreover, tan ϕ increases due to the development of texture formation, a textured sheet with d/t = 1.34 shows a large tan ϕ of about 0.09 in the martensite phase. Damping alloys with tensile strength over 850 MPa and tan ϕ of about 0.04 can be obtained by controlling the relative grain size and texture.