Abstract

This paper focuses on the study of thermal shock behaviors of a novel TiC_x–Ni₃(Al,Ti)/Ni functionally graded material (FGM) fabricated from Ti₃AlC₂ and Ni powders. Thermal shock resistance of resulted FGM was conducted by water quenching at different temperatures, mechanical properties and microstructures after thermal shocks were correspondingly determined and characterized. The microstructure of the FGM after thermal shocks shows no cracks of instability failure between the transition zones, and the reinforcement phases were closely combined with the matrix. Meanwhile, compared with the strength of 1329 MPa without thermal shock, when the temperature of the thermal shock reached 800 °C and 1000 °C respectively, with 10 repeated heat-water quench cycles, the residual flexural strength of FGM decreased slightly, but it could still reach 1100 MPa. Notably, the strength can still maintain at 843 MPa after 10 cycles of thermal shock at 1200 °C. Such excellent thermal shock performance may be the result of the good interfacial bonding and the special gradient structure, the oxidation layer also plays a protective role.

Graphical abstract

中文翻译：

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新型TiC x –Ni 3（Al，Ti）/ Ni功能梯度复合材料的热冲击行为

摘要

本文重点研究由Ti ₃ AlC ₂制成的新型TiC _x –Ni ₃（Al，Ti）/ Ni功能梯度材料（FGM）的热冲击行为。和镍粉。通过在不同温度下水淬，对所得的FGM进行抗热震性测试，并相应地确定和表征了热冲击后的力学性能和微观结构。热冲击后的FGM的微观结构在过渡区域之间没有出现失稳破裂的裂纹，并且增强相与基体紧密结合。同时，与没有热冲击的1329 MPa强度相比，当热冲击温度分别达到800°C和1000°C时，经过10次重复的水-水淬火循环，FGM的残余挠曲强度略有下降，但仍可达到1100 MPa。值得注意的是，在1200°C下经过10次热冲击后，强度仍可保持在843 MPa。

图形概要