Internal friction behaviour of Ni–Mn–Ga
Internal friction behaviour of Ni–Mn–Ga
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DOI：
10.1016/j.msea.2003.07.008
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发表时间：
2004-04
期刊：
影响因子：
6.4
通讯作者：
C. Seguí;E. Cesari;J. Pons;V. Chernenko
中科院分区：
文献类型：
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作者：
C. Seguí;E. Cesari;J. Pons;V. Chernenko
形状记忆合金（SMA）的内摩擦（IF）行为表现为马氏体相变（MT）时的IF峰值和弹性模量的最小值，且马氏体态的IF值高于母相。中频峰被认为是由三个贡献组成的，其中最重要的是所谓的“瞬态”贡献，只存在于非零温度速率下。另一方面，铁磁Ni-Mn-Ga系合金经历了从l21有序母相到马氏体的相变，相变的特征主要取决于合金的e/a比。事实上，在广泛研究的合金中已经观察到多种转变序列，包括介于母体和马氏体之间的中间相和马氏体间转变。此外，在冷却和加热过程中，这些合金的中频和模量表现出特定的特征，如模量异常、弹性模量的强烈温度依赖性、马氏体的温度依赖性内摩擦，以及作为一个总体趋势，中频的瞬态贡献很小。在目前的工作中，将回顾几种Ni-Mn-Ga合金的中频和模量行为，并将其与Cu或niti基形状记忆合金等“经典”系统的观察结果进行比较。
The internal friction (IF) behaviour of shape memory alloys (SMA) is characterised by an IF peak and a minimum of the elastic modulus during the martensitic transformation (MT), and a higher IF value in the martensitic state than in parent phase. The IF peak is considered to be built of three contributions, the most important of them being the so-called “transient” one, existing only at non-zero temperature rate. On the other hand, the ferromagnetic Ni–Mn–Ga system alloys undergoes a MT from the L21ordered parent phase to martensite, the characteristics of the transformation depending largely on the e/a ratio of the alloys. Indeed, a variety of transformation sequences, including intermediate phases between parent and martensite and intermartensitic transformations, have been observed for a wide set of studied alloys. Furthermore, the IF and modulus behaviour during cooling and heating these alloys show specific characteristics, such as modulus anomalies, strong temperature dependence of the elastic modulus, temperature dependent internal friction in martensite, and, as a general trend, a low transient contribution to the IF. In the present work, the IF and modulus behaviour of several Ni–Mn–Ga alloys will be reviewed and compared to that observed for “classical” systems like Cu- or NiTi-based shape memory alloys.