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材料导报  2025, Vol. 39 Issue (19): 24070139-9    https://doi.org/10.11896/cldb.24070139
  金属与金属基复合材料 |
原位反应法制备ZrB2/Al-12Si复合材料的显微组织及高温蠕变性能
李秋生1, 李安敏1,2,3,*, 眭清平1
1 广西大学资源环境与材料学院,南宁 530004
2 广西大学省部共建特色金属材料与组合结构全寿命安全国家重点实验室,南宁 530004
3 广西大学有色金属及材料加工新技术教育部重点实验室,南宁 530004
Study on the Microstructure and Elevated Temperature Creep Properties of In-situ ZrB2 Particulates Reinforced Al-12Si Composites
LI Qiusheng1, LI Anmin1,2,3,*, SUI Qingping1
1 School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
2 State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Guangxi University, Nanning 530004, China
3 MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Guangxi University, Nanning 530004, China
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摘要 本研究通过盐-金属反应途径成功合成了ZrB2/Al-12Si复合材料,研究了ZrB2质量分数和热处理工艺对复合材料显微组织、高温蠕变性能的影响。蠕变实验结果表明,4%ZrB2/Al-12Si(质量分数,如无特别说明,下同)复合材料的稳态蠕变速率明显比Al-12Si合金小,表明ZrB2纳米颗粒的加入有效地提高了基体合金的蠕变阻力。ZrB2纳米颗粒高温热稳定性好,有效地阻碍了位错的运动和高温蠕变过程中晶界的迁移。此外,由于裂纹的偏转和裂纹的分支,ZrB2纳米颗粒增加了裂纹扩展路径的长度。在相同的温度和应力条件下,T5态4%ZrB2/Al-12Si复合材料的稳态蠕变速率比T6态4%ZrB2/Al-12Si复合材料的稳态蠕变速率小。热处理工艺对复合材料蠕变影响的研究结果表明,T5态和T6态复合材料具有相近的蠕变应力指数。由于T6热处理影响了复合材料的微观结构,共晶硅网状结构的瓦解导致其承担应力的能力下降,使T6态复合材料稳态蠕变速率变大。T5态和T6态ZrB2/Al-12Si复合材料的真实应力指数均为5.0,蠕变机制均为位错攀移机制。复合材料的强化机制为由ZrB2纳米颗粒引起的Orowan强化和细晶强化。
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李秋生
李安敏
眭清平
关键词:  铝基复合材料  高温蠕变  热处理  ZrB2颗粒    
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
出版日期:  2025-10-10      发布日期:  2025-09-24
ZTFLH:  TB35  
基金资助: 广西重点研发计划(桂科 AB22080015);2022 年广西科技基地和人才专项(桂科 AD21238010); 2021 年中央引导地方科技发展资金专项(桂科ZY21195030)
通讯作者:  *李安敏,博士,广西大学资源环境与材料学院副教授、硕士研究生导师。主要从事高熵合金、铝合金的强韧化、复合材料方面的研究。lamanny@126.com   
作者简介:  李秋生,广西大学资源环境与材料学院硕士研究生,在李安敏副教授的指导下进行研究。目前主要研究领域为耐热铝合金。
引用本文:    
李秋生, 李安敏, 眭清平. 原位反应法制备ZrB2/Al-12Si复合材料的显微组织及高温蠕变性能[J]. 材料导报, 2025, 39(19): 24070139-9.
LI Qiusheng, LI Anmin, SUI Qingping. Study on the Microstructure and Elevated Temperature Creep Properties of In-situ ZrB2 Particulates Reinforced Al-12Si Composites. Materials Reports, 2025, 39(19): 24070139-9.
链接本文:  
https://www.mater-rep.com/CN/10.11896/cldb.24070139  或          https://www.mater-rep.com/CN/Y2025/V39/I19/24070139
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