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

Metals

Shih-Hang Chang¹  Wei-Jyun Chan¹  Shyi-Kaan Wu² 

[1] Department of Chemical and Materials Engineering, National I-Lan University, I-Lan 260, Taiwan;Department of Materials Science and Engineering, National Taiwan University, Taipei 106, Taiwan;

关键词: shape memory alloys (SMAs);    martensitic transformation;    internal friction;    dynamic mechanical analysis;   

DOI  :  10.3390/met7100397

来源: DOAJ

【 摘 要 】

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 ( IF PT + IFI)β 3 (L 21 )→γ 3 ′ (2 H)peaks exhibit higher damping capacity than the Cu-7.0Zn-11Al SMA with a ( IF PT + IFI)β 3 (L 21 )→γ 3 ′ (2 H)peak, because theγ 3 ′martensite phase possesses a 2H type structure with abundant movable twin boundaries, while theβ 3 ′phase possesses an 18R structure with stacking faults. The Cu-9.0Zn-11Al SMA also possesses a ( IF PT + IFI)β 3 (L 21 )→γ 3 ′ (2 H)peak but exhibits low damping capacity because the formation of γ 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 δ > 0.05 around room temperature.

【 授权许可】

Unknown