Improving the temperature stability of superelastic stress of Cu-Al-Mn shape memory alloy in a wide temperature rang by torsion pre-deformation
Improving the temperature stability of superelastic stress of Cu-Al-Mn shape memory alloy in a wide temperature rang by torsion pre-deformation
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DOI：
10.1016/j.matlet.2023.134214
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发表时间：
2023-03
影响因子：
3
通讯作者：
Yan Zhu;Jili Liu;Xide Li;Jiangquan Li;Lei Zhang;Bin Li
中科院分区：
文献类型：
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作者：
Yan Zhu;Jili Liu;Xide Li;Jiangquan Li;Lei Zhang;Bin Li
为了提高形状记忆合金（SMA）在宽温度范围内的温度稳定性，采用扭转预变形（TPD）处理实现了对柱状晶Cu-Al-Mn SMA中奥氏体和马氏体双相的控制，降低了超弹性应力的温度依赖性。结果表明，TPD后残余马氏体相沿截面呈梯度分布，单位扭转角为0.75-3.75°/mm，TPD后双相组织可抑制SMA超弹性应力的温度依赖性，同时在大应变下保持明显的超弹性。Cu-Al-Mn形状记忆合金在TPD（τ ′ = 0.75°/mm）后的应力诱发马氏体相变应力随温度的变化率（dσ/dT）在200 K左右的较宽温度范围内为0.37 MPa/K，优于已报道的Cu-Al-Mn形状记忆合金和NiTi形状记忆合金。
To improve the temperature stability of shape memory alloys (SMAs) in wide temperature range, the torsion pre-deformation (TPD) treatment was used to realize the dual phases (austenite and martensite) control and reduce temperature dependence of superelastic stress in columnar-grained Cu-Al-Mn SMAs. Results show that residual martensite phase in the samples is distributed in a gradient across the cross section after TPD with the unit torsion angle (φ') of 0.75–3.75°/mm. Dual-phase structure after TPD can suppress temperature dependence of superelastic stress of SMAs while maintaining the superelasticity obviously under large strains. The change rate of stress-induced martensitic transformation stress with temperature (dσ/dT) of Cu-Al-Mn SMA after TPD (φ'=0.75°/mm) is 0.37 MPa/K over a wide range of temperature about 200 K, which is better than other reported Cu-Al-Mn SMAs and NiTi SMAs.