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THE FAILURE MECHANISM OF REVERSE SHAPE MEMORY EFFECT IN A Cu-BASE ALLOY

C.M Li , G.X. Dong , S.T- Dai , and D. Y Chen (Tsinghua University Beijing 100084 , China)J Yin and D.X. Hu (Shanghai No.5 Steel Works , Shanghai 200940 , China)

金属学报(英文版)

The interior structural evolution accompanying reverse shape memory effect (RSMEin a Cu-Zn-Al alloy was studied by means of transmission electron microscopy. It was found that RSME is closely related to bainitic transformation in this alloy during the isothermal reaction at moderate temperatures. At a given temperature and a certain external constraint stress, the shape memory effect depends mainly on the aging time.During the early stage, the shape memory effect enhances with the increase of reactiotn time. Then it will decrease gradually apon further aging. If the alloy is overaged, the stacking faults of bainite will disappear gradually by the motion of partial dislocations through which long range diffusion of solute atoms takes place, giving rise to the deterioration of RSME. When all the bainite transforms to α phase, RSME will lose completely.

关键词: reverse shape memory effect , null , null , null

空冷态FeMnAlNi形状记忆合金逆向记忆效应的研究

黄攀 , 彭华备 , 文玉华

金属功能材料 doi:10.13228/j.boyuan.issn1005-8192.2016020

采用金相法、XRD和热膨胀法研究了经1 150℃固溶10 min后的空冷态Fe43.6Mn34.7Al13.4Ni8.3合金的逆向记忆效应.结果表明:空冷态Fe43.6 Mn33.7Al13.4Ni8.3合金在400℃至700℃之间呈现显著的逆向记忆效应,其源于α→γ相变.在α→γ相变时,依附于γ'马氏体形成的板条状γ相以及与γ '马氏体成一定角度的针状γ相对逆向记忆效应的贡献显著大于蠕虫状γ相.

关键词: FeMnAlNi合金 , 形状记忆合金 , 逆向记忆效应 , α→γ相变 , γ'马氏体

MICROSTRUCTURE AND REVERSE SHAPE MEMORY EFFECT IN A Cu-Zn-Al ALLOY

DONG Jianxin CHEN Fumin CHEN Jinming LIU Wenxi Tianjin University , Tianjin , China At pressent he works in Department of materials Science and Technology , University of Science and Technology , Beijing.

金属学报(英文版)

The bainite structure in a Cu-Zn-A1 alloy related to the reverse shape memory effect has been observed by means of TEM.The reverse memory effect may be improved by up to one order of magnitude under applied constraint stress.The widespread propagation of bainite was confirmed to be the diffusion controlled shear process by the parabolic configuration of side interface of bainite plate and the twisting of intersected bainite plates.

关键词: Cu-Zn-Al memory alloy , null , null

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