中国物理B ›› 2015, Vol. 24 ›› Issue (6): 66104-066104.doi: 10.1088/1674-1056/24/6/066104

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Room temperature damping correlated to the microstructures in Cu-20.4Al-8.7Mn

郝刚领a, 王新福b, 王辉c, 李先雨a   

  1. a College of Physics and Electronic Information, Yan'an University, Yan'an 716000, China;
    b Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China;
    c State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
  • 收稿日期:2014-10-19 修回日期:2015-01-23 出版日期:2015-06-05 发布日期:2015-06-05
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 51301150), the Special Program of Science and Technology New Star of Shaanxi Province, China (Grant No. 2013KJXX-11), and the High-level University Construction Special Program of Shaanxi Province, China (Grant No. Physics-2012SXTS05).

Room temperature damping correlated to the microstructures in Cu-20.4Al-8.7Mn

Hao Gang-Ling (郝刚领)a, Wang Xin-Fu (王新福)b, Wang Hui (王辉)c, Li Xian-Yu (李先雨)a   

  1. a College of Physics and Electronic Information, Yan'an University, Yan'an 716000, China;
    b Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China;
    c State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2014-10-19 Revised:2015-01-23 Online:2015-06-05 Published:2015-06-05
  • Contact: Hao Gang-Ling E-mail:glhao@issp.ac.cn
  • About author:61.72.Hh; 61.72.Mm; 61.66.Dk; 81.30.Kf
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 51301150), the Special Program of Science and Technology New Star of Shaanxi Province, China (Grant No. 2013KJXX-11), and the High-level University Construction Special Program of Shaanxi Province, China (Grant No. Physics-2012SXTS05).

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摘要： The damping capacity of the shape memory alloy Cu–20.4Al–8.7Mn (at.%) at room temperature is investigated by an internal friction technique. Results indicate that the alloy exhibits higher damping capacity in the Martensitic condition than that in the austenitic condition due to the latter having lower intrinsic damping capacity and pinning effect coming from the precipitate particles. The maximum damping capacity is obtained in the coexistence condition of Martensite and austenite. The condition can be achieved when processing an isothermal ageing for the as-cast sample at temperatures of 100 ℃–150 ℃. Three possible mechanisms are considered to account for the maximum damping capacity. They are listed as much increased interfaces between twin boundaries, owing to the thinning of martensitic plates, martensitic transformation induced by the applied stress during internal friction measurements, phase transformation itself based on the coexistence of martensitic and austenitic phases with a macroscopic amount. However, the contribution of the first mechanism is predominant.

关键词: internal friction, damping, shape memory alloy, microstructure

Abstract: The damping capacity of the shape memory alloy Cu–20.4Al–8.7Mn (at.%) at room temperature is investigated by an internal friction technique. Results indicate that the alloy exhibits higher damping capacity in the Martensitic condition than that in the austenitic condition due to the latter having lower intrinsic damping capacity and pinning effect coming from the precipitate particles. The maximum damping capacity is obtained in the coexistence condition of Martensite and austenite. The condition can be achieved when processing an isothermal ageing for the as-cast sample at temperatures of 100 ℃–150 ℃. Three possible mechanisms are considered to account for the maximum damping capacity. They are listed as much increased interfaces between twin boundaries, owing to the thinning of martensitic plates, martensitic transformation induced by the applied stress during internal friction measurements, phase transformation itself based on the coexistence of martensitic and austenitic phases with a macroscopic amount. However, the contribution of the first mechanism is predominant.

Key words: internal friction, damping, shape memory alloy, microstructure

中图分类号:  (Indirect evidence of dislocations and other defects (resistivity, slip, creep, strains, internal friction, EPR, NMR, etc.))

  • 61.72.Hh
61.72.Mm (Grain and twin boundaries) 61.66.Dk (Alloys ) 81.30.Kf (Martensitic transformations)