Damping Characteristics of Inherent and Intrinsic Internal Friction of Cu-Zn-Al Shape Memory Alloys

作者：Wu Shyi Kaan; Chan Wei Jyun; Chang Shih Hang^*

来源：Metals, 2017, 7(10): 397.

DOI：10.3390/met7100397

• shape memory alloys (SMAs)
• martensitic transformation
• internal friction
• dynamic mechanical analysis

Damping properties of the inherent and intrinsic internal friction peaks (IFPT + IFI) of Cu-xZn-11Al (x = 7.0, 7.5, 8.0, 8.5, and 9.0 wt. %) shape memory alloys (SMAs) were investigated by using dynamic mechanical analysis. The Cu-7.5Zn-11Al, Cu-8.0Zn-11Al, and Cu-8.5Zn-11Al SMAs with (IFPT + IFI)(beta 3(L21)->gamma 3' (2H)) peaks exhibit higher damping capacity than the Cu-7.0Zn-11Al SMA with a (IFPT + IFI)(beta 3(L21)->gamma 3' (2H)) peak, because the gamma(3)' martensite phase possesses a 2H type structure with abundant movable twin boundaries, while the beta(3)' phase possesses an 18R structure with stacking faults. The Cu-9.0Zn-11Al SMA also possesses a (IFPT + IFI)(beta 3(L21)->gamma 3' (2H)) peak but exhibits low damping capacity because the formation of gamma phase precipitates inhibits martensitic transformation. The Cu-8.0Zn-11Al SMA was found to be a promising candidate for practical high-damping applications because of its high (IFPT + IFI) peak with tan delta > 0.05 around room temperature.

• 出版日期2017-10