In-situ observation of Ni-11.5 wt%Si eutectic microstructure evolution and exploration of strengthening mode of Ni-Ni3Si eutectic composites

被引：1

作者：

Wu, Chongyang ^{[1
]}

Cui, Chunjuan ^{[1
]}

Liu, Wei ^{[1
]}

Zhang, Kai ^{[1
]}

Wang, Zhicong ^{[1
]}

Zhao, Yanan ^{[1
]}

Su, Haijun ^{[2
]}

机构：

[1] Xian Univ Architecture & Technol, Sch Met Engn, Xian 710055, Peoples R China

[2] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2024年 / 317卷

关键词：

Directional solidification; In-situ observation; Microstructure; Metastable phaseNi31Si12; Heat treatment; Fracture morphology;

D O I：

10.1016/j.matchemphys.2024.129063

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Microstructure evolution of the Ni-11.5 wt%Si eutectic alloy during the melting and cooling process was elaborately examined using a high-temperature confocal laser scanning microscope (HT-CLSM). The thermal stability of the phase composition within the Ni-11.5 wt%Si eutectic alloy was thoroughly analyzed. The intricate mechanism governing the solidification of the Ni-11.5 wt%Si eutectic alloy, along with the formation of the metastable Ni31Si12 phase under varying cooling rates, was systematically investigated. Through in-depth in-situ observations, a welldefined heat treatment procedure was developed for Ni-Ni3Si eutectic composites. Remarkably, the metastable Ni31Si12 phase can completely transform into Ni3Si upon undergoing the prescribed heat treatment, yielding a refined lamellar structure. This structural refinement notably results in substantial enhancements in the compressive properties and fracture toughness of the Ni-Ni3Si eutectic composite at ambient temperatures.

引用

页数：13

共 31 条

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