摘要
零热膨胀材料由于在一定温域内表现出极小的体积或尺寸变化,在光学仪器、精密电子设备、航空航天等领域具有广泛的应用前景。Ho_(2)Fe_(17)合金的磁相变伴随着显著的磁体积效应,有效补偿了晶格非简谐振动导致的正热膨胀效应,使得该合金表现出负热膨胀行为。通过真空电弧熔炼的方法,在Ho_(2)Fe_(17)合金中引入硼元素,实现了宽温域的零热膨胀特性,其中Ho_(2)Fe_(17)B_(0.2)在120~350 K的温域范围内的热膨胀系数仅为-0.74×10^(-6) K^(-1)。进一步通过扫描电子显微镜、X射线衍射仪、振动样品磁强计等设备表征了样品的显微形貌、晶体结构、磁相变行为,分析了热膨胀行为的调控机制。为设计和调控材料的热膨胀性能提供了新思路。
Zero thermal expansion materials are widely applicable in precise instruments such as optical devices, electronic equipment, and aerospace components due to their minimal volume expansion within a fixed temperature range. The strong magneto-volume effect associated with a magnetic phase transition compensates the positive thermal expansion caused by the inharmonic lattice thermal vibration, which leads to a negative thermal expansion effect. A small amount of boron was introduced into the Ho2Fe17 alloy, which leads to zero thermal expansion in a wide temperature range. The Ho_(2)Fe_(17)B_(0.2) alloy exhibited a thermal expansion coefficient of only -0.74×10^(-6) K^(-1) within the temperature range of 120-350 K. Comprehensive characterizations, including scanning electron microscopy, X-ray diffraction, and vibrating sample magnetometer, were conducted to analyze the microstructure, crystal structure, and magnetic phase transition behavior of the samples. The underlying mechanism for the regulation of thermal expansion behavior has also been discussed, which provides new insights and approaches for the development of advanced zero thermal expansion materials.
作者
李俊沛
周静雯
蔡银颖
林志伟
王鑫
朴贤政
缪雪飞
徐锋
LI Junpei;ZHOU Jingwen;CAI Yinying;LIN Zhiwei;WANG Xin;PIAO Xianzheng;MIAO Xuefei;XU Feng(School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China)
出处
《金属功能材料》
2025年第3期14-20,共7页
Metallic Functional Materials
基金
国家级大学生创新创业训练计划(202410288097Z)。
