| Ni55Mn25Ga18Ti2高温形状记忆合金的热循环稳定性 |
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| 引用本文： | 辛燕,王福星. Ni55Mn25Ga18Ti2高温形状记忆合金的热循环稳定性[J]. 工程科学学报, 2022, 44(6): 1020-1026. DOI: 10.13374/j.issn2095-9389.2021.02.26.001 |
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| 作者姓名： | 辛燕 王福星 |
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| 作者单位： | 华北电力大学能源动力与机械工程学院，北京 102206 |
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| 基金项目： | 国家自然科学基金;中央高校基本科研业务费专项资金资助项目 |
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| 摘 要： | 选择双相韧化的Ni?Mn?Ga?Ti高温形状记忆合金为研究对象。制备了淬火态Ni55Mn25Ga18Ti2高温形状记忆合金，并对其在室温至480 ℃之间进行高达500次的相变热循环，获得了5, 10, 50, 100和500次热循环态样品。采用X射线衍射、扫描电镜、能谱仪、同步热分析仪及室温压缩等实验方法，研究了淬火态和热循环态合金样品的微观组织、相变行为、力学及记忆性能，进而分析其热循环稳定性。研究结果表明:经500次循环后，Ni55Mn25Ga18Ti2合金相结构和显微组织未发生明显变化，均为由非调制四方结构的板条马氏体相和面心立方富Ni的γ相组成的双相结构；随着循环次数增加，马氏体相变温度几乎不变，逆马氏体相变温度和相变滞后在循环5次后趋于稳定；抗压强度及压缩变形率波动幅度较小；形状记忆性能下降，但形状记忆应变仍保持在1.4%以上；Ni55Mn25Ga18Ti2高温形状记忆合金显示出良好的热循环稳定性。
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| 关 键 词： | Ni?Mn?Ga?Ti 高温形状记忆合金 热循环稳定性 微观组织 马氏体相变 |
| 收稿时间： | 2021-02-26 |
Thermal cycling stability of Ni55Mn25Ga18Ti2 high-temperature shape memory alloy |
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| XIN Yan,WANG Fu-xing. Thermal cycling stability of Ni55Mn25Ga18Ti2 high-temperature shape memory alloy[J]. Chinese Journal of Engineering, 2022, 44(6): 1020-1026. DOI: 10.13374/j.issn2095-9389.2021.02.26.001 |
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| Authors: | XIN Yan WANG Fu-xing |
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| Affiliation: | School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China |
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| Abstract: | Research on high-temperature shape memory alloys has attracted much attention due to the control requirements of the high-temperature drive (>100 ℃) and the overheating warning in high voltage transmissions, nuclear power, aerospace, automotive, oil exploration, and other engineering fields. High-temperature shape memory alloys refer to those with reverse martensitic transformation starting temperature (As) higher than 100 ℃. A wide range of high-temperature shape memory alloys exists, including Ti?Ni?Pd/Pt, Ni?Ti?Hf/Zr, Cu?Al?Ni, Ni?Mn?Ga, Ru-based, β-Ti-based, and Co-based systems. Besides the high transformation temperatures and good mechanical and shape memory properties, the thermal stability of microstructures and properties at high temperatures and after thermal cycling transformations is also an important basis for evaluating the practicability of high-temperature shape memory alloys. Dual-phase Ni?Mn?Ga?Ti high-temperature shape memory alloys were chosen because of their better ductility compared with single-phase Ni?Mn?Ga alloys. In this paper, the as-quenched Ni55Mn25Ga18Ti2 high-temperature shape memory alloy was prepared. Specimens are then thermal-cycled at a temperature between the room temperature and 480 ℃ for 5, 10, 50, 100, and 500 times. The thermal stability of the microstructure, martensitic transformation temperatures, and mechanical and shape memory properties were studied by X-ray diffraction analysis, scanning electron microscopy, simultaneous thermal analyzer, and room-temperature compression analysis. Results show that there are no obvious changes in the phase structure and microstructure of the Ni55Mn25Ga18Ti2 high-temperature shape memory alloy after 500 thermal cycles. All as-quenched and thermal-cycled specimens show dual-phase structures with non-modulated tetragonal martensite and Ni-rich face-centered-cubic γ phase. With the increase of thermal cycling times, the forward martensitic transformation temperatures are almost kept constant, and the reverse martensitic transformation temperatures and the hysteresis are observed to be steady when the thermal cycles exceed five times. After 500 thermal cycles, the compressive strength and compressive stain slightly change, and the shape memory strain drops but remains over 1.4%. The Ni55Mn25Ga18Ti2 high-temperature shape memory alloy shows high thermal cycling stability. |
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