Wang Qingmeng, Cheng Xiaomin, Wang Xiuli, Yang Tao, Cheng Qianju, Liu Zhi, Lv Zean
School of Mechatronics and Intelligent Manufacturing, Huanggang Normal University, Huanggang 438000, China.
School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
Materials (Basel). 2023 Jul 28;16(15):5325. doi: 10.3390/ma16155325.
The specific heat capacity plays a crucial role in influencing the heat transfer efficiency of materials. Considering the relatively low specific heat capacity of metals, this study focuses on investigating the impact of second-phase nano Ni particles on the microstructure and thermophysical properties of the alloy matrix. The alloys' phase compositions and microstructures were examined using X-ray diffraction phase analysis (XRD), electron probe micromorphology analysis (EPMA), and X-ray fluorescence spectroscopy (XRF). Furthermore, the thermophysical properties of the alloys were comprehensively analyzed through the employment of a differential scanning calorimeter (DSC) and the laser flash method (LFA). The addition of second-phase nanoparticles significantly increased the specific heat capacity of the alloy in the liquid state; however, the phenomenon of nanoparticle agglomeration diminishes this improvement. The analysis of the specific heat enhancement mechanism indicates that ordered states are formed between the second-phase solid nanoparticles and the melted metal in the liquid state. With the increase in temperature, the destruction of these ordered states requires additional heat, resulting in the increase of specific heat capacity.
比热容在影响材料的热传递效率方面起着至关重要的作用。考虑到金属的比热容相对较低，本研究着重调查第二相纳米镍颗粒对合金基体微观结构和热物理性能的影响。使用X射线衍射相分析（XRD）、电子探针微观形貌分析（EPMA）和X射线荧光光谱（XRF）对合金的相组成和微观结构进行了检测。此外，通过使用差示扫描量热仪（DSC）和激光闪光法（LFA）对合金的热物理性能进行了全面分析。第二相纳米颗粒的添加显著提高了合金在液态下的比热容；然而，纳米颗粒团聚现象削弱了这种改善效果。对比热容增强机制的分析表明，在液态下第二相固体纳米颗粒与熔化的金属之间形成了有序状态。随着温度升高，这些有序状态的破坏需要额外的热量，从而导致比热容增加。
