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 phi 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 0 increases due to the development of texture formation, a textured sheet with d/t = 1.34 shows a large tan phi of about 0.09 in the martensite phase. Damping alloys with tensile strength over 850 MPa and tan phi of about 0.04 can be obtained by controlling the relative grain size and texture. (c) 2006 Elsevier B.V. All rights reserved.