原位反应法制备ZrB<sub>2</sub>/Al-12Si复合材料的显微组织及高温蠕变性能

doi:10.11896/cldb.24070139

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Abstract This study successfully synthesized ZrB₂/Al-12Si composite through salt-metal reaction pathway and investigated the effects of ZrB₂ mass fraction and heat treatment process on the microstructure and elevated temperature tensile creep properties of the composite. The creep test results show that the steady-state creep rate of the 4wt%ZrB₂/Al-12Si composite is significantly lower than the steady-state creep rate of Al-12Si alloy, indicating that the addition of ZrB₂ nanoparticles effectively improves the creep resistance. ZrB₂ nanoparticles have good elevated temperature thermal stability, effectively hindering the movement of dislocations and the migration of grain boundaries during elevated temperature creep processes. In addition, due to the deflection and branching of cracks, ZrB₂ nanoparticles increase the length of crack propagation path. Under the same temperature and stress conditions, the steady-state creep rate of T5 state 4wt%ZrB₂/Al-12Si composite is lower than that of T6 state 4wt%ZrB₂/Al-12Si composite. The research results on the influence of heat treatment process on the creep of composite show that T5 state and T6 state composite have similar creep stress indices. Due to the influence of T6 heat treatment on the microstructure of the composite, the disintegration of the eutectic silicon network structure leads to a decrease in its ability to bear stress, resulting in an increase in the steady-state creep rate of T6 state composite materials. The true stress index of both T5 state and T6 state ZrB₂/Al-12Si composite is 5.0, and the creep mechanism is dislocation climb mechanism. The strengthening mechanism of composite is Orowan strengthening and fine grain strengthening induced by nano-sized ZrB₂ particles.

Key words： aluminum matrix composite elevated temperature creep heat treatment ZrB₂ particle

Published: 10 October 2025 Online: 2025-09-24

CLC number:

TB35

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	LI Qiusheng
	LI Anmin
	SUI Qingping

Cite this article:

LI Qiusheng,LI Anmin,SUI Qingping. Study on the Microstructure and Elevated Temperature Creep Properties of In-situ ZrB₂ Particulates Reinforced Al-12Si Composites[J]. Materials Reports, 2025, 39(19): 24070139-9.

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https://www.mater-rep.com/EN/10.11896/cldb.24070139 OR https://www.mater-rep.com/EN/Y2025/V39/I19/24070139

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