| 黄星植,李喜德*.扫描显微环境下电流加热试件时的温度控制[J].实验力学,2019,34(6):911~925 |
| 扫描显微环境下电流加热试件时的温度控制 |
| Temperature control method during current heating of a specimen in scanning microenvironment |
| 投稿时间：2019-07-10 修订日期：2019-08-20 |
| DOI：10.7520/1001-4888-19-120 |
| 中文关键词: 焦耳热 高温力学性能 电加热 扫描电子显微镜 反馈控制 |
| 英文关键词:Joule heat high temperature mechanical properties electric heating scanning electron microscope feedback control |
| 基金项目:国家自然科学基金(11632010, 11872035)资助 |
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| 中文摘要: |
| 如何实现扫描电镜(SEM)腔体内电加热试件的恒温控制，对于金属及合金材料在超高温环境下的微观力学性能的原位测量具有重要意义。本文在MATLAB GUI以及串口通信的基础上，建立了SEM环境中高温电加热系统，提出了一种SEM环境下串口通讯控制样品温度的电流加热控制方法，以及高效、灵敏的反馈函数，设计了友好的软件控制和测量界面，在SEM环境中对不同材料进行了测试，实现了单向拉伸加载条件下电流加热钨丝试件1700℃时与镍基单晶合金试件1000℃时，试件的温度波动分别保持在±3℃与±1℃之内。随后，利用该系统完成了1400℃静态和1200℃单轴拉伸与疲劳实验，系统在此温度时依然可获得高质量的原位扫描显微图像。该实验验证了所提方法对电流加热试件温度控制的有效性，为焦耳热加热实现材料高温力学性能研究，以及研究电加热对材料热性能的影响等关键问题提供了可靠的实验平台。 |
| 英文摘要: |
| It is very important to realize the thermostatic control of scanning electron microscope (SEM) specimens for in situ measurement of microscopic mechanical properties of metal and alloy materials under ultra-high temperature. Based on the MATLAB GUI and serial port communication, a high temperature electric heating system in SEM environment is established, and a current heating control method of serial port communication to control sample temperature in SEM environment as well as an efficient and sensitive feedback function is proposed. A friendly interface of software is designed to test different materials in SEM environment. Under uniaxial tension, temperature fluctuations of tungsten filament specimen at 1700℃ and nickel-based single crystal alloy specimen at 1000℃ can be kept within ±3℃ and ±1℃, respectively. Subsequently, the static and uniaxial tensile and fatigue tests of 1400℃ and 1200℃ are carried out according to the system. These experiments verify the effectiveness of the proposed method for the temperature control of electric current heating specimens and provide a reliable experimental platform for the research of key issues such as the realization of high temperature mechanical properties of materials by Joule heating. |
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