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| 持续电流作用下金属间化合物NiAl薄板热弯成形 |
| Thermal Bending of Intermetallic Compounds NiAl Sheet with Continuous Current |
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| DOI：10.3969/j.issn.1674-6457.2022.12.015 |
| 中文关键词: 金属间化合物 镍铝 脉冲电流 热成形 |
| 英文关键词: intermetallic compounds NiAl pulse current thermal bending |
| 基金项目:国家自然科学基金(52175297) |
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| 中文摘要: |
| 目的 为了解决和克服现有耐高温金属间化合物成形难、传统等温热成形效率和能源利用率低的问题，开发持续电流作用下金属间化合物薄板热弯成形新技术。方法 首先，对NiAl板材进行系统的升温实验，确定热弯成形的电流密度。然后对NiAl板材进行三点弯曲实验，确定凸模下压速度。最后，在自行设计并制作的可实现电与载荷持续复合作用的热弯成形装置和陶瓷绝缘模具上对板材进行热弯成形实验。结果 在电流密度为8.5 A/mm2、加热温度为1 300 ℃、凸模下压速度为0.5 mm/min的实验条件下，成形后的热弯件尺寸精度良好、厚度均匀，无开裂和回弹产生。结论 该方法主要针对热弯曲成形工艺，解决了金属间化合物难变形及传统脉冲电流辅助热成形难以在变形过程中持续通电的问题，改善了金属间化合物成形时产生的开裂和回弹。 |
| 英文摘要: |
| The work aimsto solve and overcome the difficulties in forming of the existing high temperature resistant intermetallic compounds, and the low efficiency in the traditional isothermal forming and the underutilization of energy in the process, a new technology of continuous current thermal bending for intermetallic compounds sheet is developed. Firstly, with temperature experiments performed systematically for NiAlsheets, the current density of thermal bending is determined. And then, three point bending tests of NiAl sheets are made to identify the punch press speed. Finally, thermal bending experiments are carried out on a self-designed and manufactured thermal bending device and ceramic insulating mold that can combine current with load continuously. Under the experimental conditions of current density of 8.5 A/mm2, heating temperature of 1 300 ℃ and punch pressing speed of 0.5 mm/min, the thermal bending parts after forming are obtained with good dimensional precision, uniform thickness, and no cracking or springback. This approach is aimed specifically at thermal bending, difficulties in the intermetallic compounds deformation are greatly reduced. The problem that the traditional pulsed current assisted thermal forming is difficult to sustain power in the deformation process is also addressed, and cracking and springback are eventually avoided. |
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