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

作　　者：郝刚领 王新福 王辉 李先雨 

机构地区：[1]College of Physics and Electronic Information,Yan'an University [2]Key Laboratory of Materials Physics,Institute of Solid State Physics,Chinese Academy of Sciences [3]State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing

出　　处：《Chinese Physics B》2015年第6期457-460,共4页中国物理B（英文版）

基　　金：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);the High-level University Construction Special Program of Shaanxi Province,China(Grant No.Physics-2012SXTS05)

摘　　要：The damping capacity of the shape memory alloy Cu-20.4A1-8.7Mn （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.The damping capacity of the shape memory alloy Cu-20.4A1-8.7Mn （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 

分 类 号：TG146.11[一般工业技术—材料科学与工程] TG139.6[金属学及工艺—金属材料]