The effect of superelastic strain on the damping capacity in columnar-grained Cu-Al-Mn shape memory alloy
The effect of superelastic strain on the damping capacity in columnar-grained Cu-Al-Mn shape memory alloy
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超弹应变对柱状晶Cu-Al-Mn形状记忆合金阻尼能力的影响
DOI：
10.1016/j.jallcom.2018.12.017
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发表时间：
2019-04
影响因子：
6.2
通讯作者：
Shilin Yan
中科院分区：
文献类型：
--
作者：
Jili Liu;Mohan Li;Xu Li;Wangxian Yan;Wei Huang;Shilin Yan
柱晶Cu-Al-Mn形状记忆合金(SMA)具有7%以上的高超弹性应变，晶界平直，沿凝固方向织构强烈，具有近100%的超弹性恢复率，可达到单晶Cu基或Ni-Ti形状记忆合金的应变水平，具有潜在的减振应用前景。本文研究了铜铝锰形状记忆合金在应变控制超弹性循环拉伸过程中不同变形条件下的减振性能。分析了材料的各向异性特性和阻尼力的循环效应。在超弹性拉伸过程中，柱晶Cu-Al-Mn形状记忆合金的减振能力随着加载应变的增加而增加，并出现较大的减振能力各向异性。在较低的加载应变(<；6%)下，T-45°试件(45°为加载方向与柱状晶的轴线夹角)由于其应力水平较高，具有最大的单位回复应变能量耗散ΔW1%。在高加载应变(>；6%)下，T-0°和T-15°试件由于具有较高的超弹性和塑性，可以获得良好的减振性能。此外，柱晶CuAl-Mn形状记忆合金沿凝固方向的减振性能具有显著的循环效应。在相同的加载应变(4%~10%)、ΔW1%和损耗角ΔW/2πW随循环次数的增加先减小到最小，然后增大到最大，最后减小。ΔW 1%和ΔW/2πW在不同应变幅值下的极小和极大值对应于相似的残余应变比εr/εt，与εr/εt相关的阻尼力变化曲线可分为三个阶段：低残余应变的稳定阻尼力阶段；迅速增加的阻尼力阶段；应变阻尼力有限的残余马氏体急剧累积阶段。
Columnar-grained Cu-Al-Mn shape memory alloy (SMA) can experience high superelastic strain exceeding 7% and exhibits a nearly 100% superelastic recovery ratio due to its straight grain boundaries and strong texture along the solidification direction, which allows it to reach the strain level of a single crystalline Cu-based or Ni-Ti SMAs and possesses a potential for damping applications. In this paper, the damping capacity of Cu-Al-Mn SMA in various deformation conditions during a strain-controlled superelastic cyclic tensile process was studied. The anisotropy characteristics and the cyclic effect of damping capacity were analysed. The damping capacity of columnar-grained Cu-Al-Mn SMA increases as the loading strain increases in superelastic tensile processes, and a large damping capacity anisotropy occurs. At low loading strain (<6%), T-45° sample (45° is the angle between the loading direction and the axis of columnar grains) has the largest energy dissipation per unit recovery strain, ΔW1%, due to its high-stress level. At high loading strain (>6%), T-0° and T-15° samples can achieve a good damping capacity because of high superelasticity and plasticity. In addition, the damping capacity of columnar-grained Cu-Al-Mn SMA along the solidification direction has a significant cyclic effect. At the same loading strain (4%–10%), ΔW1%, and loss angle, ΔW/2πWfirst decrease to the minimum, then increase to the maximum and, finally, decreases as the number of cycles increases. The minima and maxima of ΔW1%and ΔW/2πWat different strain amplitudes correspond to the similar residual strain ratio,εr/εt. The change curves of damping capacity related toεr/εtcan be divided into three stages: the stable damping capacity stage with low residual strain; the rapidly increasing damping capacity stage; the sharp cumulative stage of residual martensite with limited values of strain damping capacity.
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DOI：
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