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TiNiCu(原子百分比 = 0~30%)形状记忆合金在低频下的阻尼特性

Damping Characteristics of TiNiCu ( = 0~30 at.%) Shape Memory Alloys at a Low Frequency.

作者信息

Chien Chen, Wu Shyi-Kaan, Chang Shih-Hang

机构信息

Department of Materials Science and Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 106, Taiwan.

Department of Mechanical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 106, Taiwan.

出版信息

Materials (Basel). 2014 Jun 16;7(6):4574-4586. doi: 10.3390/ma7064574.

DOI:10.3390/ma7064574
PMID:28788694
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5455937/
Abstract

The damping characteristics of TiNiCu ( = 0~30 at.%) shape memory alloys (SMAs) at a low frequency have been studied using a dynamic mechanical analyzer. The magnitude of the tan δ value and the values of the storage modulus (₀) softening/hardening and the strain variation exhibited in B2↔B19 transformation are all higher than those in B2↔B19' transformation. The larger ₀ softening/hardening in B2↔B19 can induce higher strain variation in this transformation. It is suggested that the greater mobility of the twin boundaries and the larger magnitude of the strain variation both cause the higher tan δ value exhibited in B2↔B19 transformation, as compared with B2↔B19' transformation. In comparison with that in B19' martensite, the ₀ value in B19 martensite is low and not affected so greatly by changes in temperature. Relaxation peaks are observed in B19' martensite, but not in B19 martensite, because the latter has rare twinned variants. The activation energy of the relaxation peak is calculated and found to increase as the Cu-content increases in these SMAs.

摘要

利用动态力学分析仪研究了TiNiCu(原子百分比 = 0~30)形状记忆合金(SMA)在低频下的阻尼特性。在B2↔B19相变中表现出的tanδ值的大小、储能模量(₀)软化/硬化值以及应变变化均高于B2↔B19'相变中的相应值。B2↔B19中较大的₀软化/硬化可在该相变中引起更高的应变变化。研究表明,与B2↔B19'相变相比,孪晶界更大的迁移率和更大的应变变化幅度均导致B2↔B19相变中表现出更高的tanδ值。与B19'马氏体相比,B19马氏体中的₀值较低,且受温度变化的影响不大。在B19'马氏体中观察到弛豫峰,而在B19马氏体中未观察到,因为后者的孪晶变体较少。计算了弛豫峰的激活能,发现其随这些形状记忆合金中铜含量的增加而增加。

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