陶瓷颗粒增强Zr基非晶合金复合材料高温变形行为研究  

High-temperature Deformation Behavior of Zr-based Metallic Glass Matrix Composites Reinforced by Ceramic Particle

作　　者：余国卿 许永康 王东亮 牛勇 司明达 张茂[1] 龚攀[1] 王新云[1] YU Guoqing;XU Yongkang;WANG Dongliang;NIU Yong;SI Mingda;ZHANG Mao;GONG Pan;WANG Xinyun(State Key Laboratory of Material Processing and Die&Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学材料科学与工程学院,材料成形与模具技术国家重点实验室,武汉430074

出　　处：《材料导报》2023年第1期178-184,共7页Materials Reports

基　　金：国家自然科学基金(51601063);中央高校基本科研业务费(2018KFYRCPT001)。

摘　　要：在非晶合金中添加第二相制备非晶合金复合材料能够有效地解决非晶合金室温脆性的问题,但第二相的引入对非晶基体高温变形行为造成的影响尚不明确。本研究在Zr_(55)Cu_(30)Al_(10)Ni_(5)非晶合金中添加两种不同的陶瓷颗粒Al_(2)O_(3)和Si_(3)N_(4),通过放电等离子烧结法制备了一系列不同体积分数的陶瓷颗粒增强Zr基非晶合金复合材料。通过进行高温压缩试验,并建立多颗粒随机分布模型进行数值模拟,对其高温变形行为进行了系统性研究。结果表明,在421℃时,两种复合材料都表现为应力过冲后应变硬化;在441℃时,Al_(2)O_(3)增强的复合材料表现为屈服后应变硬化,对于Si_(3)N_(4)增强复合材料,当第二相体积分数小于25%时表现为屈服后应变硬化,当第二相体积分数大于25%时材料却表现为应力过冲后应变硬化。两种非晶合金复合材料的高温变形行为差异与增强相形貌以及增强相颗粒团聚行为导致的第二相分布不均匀有关。The problem of room-temperature brittleness of metallic glass can be effectively solved by adding a second phase to prepare metallic glass matrix composites.However,the effect of the introduction of a second phase on the high-temperature deformation behavior of the amorphous matrix is not clear.In this study,two different ceramic particles,Al_(2)O_(3) and Si_(3)N_(4),were added to Zr_(55)Cu_(30)Al_(10)Ni_(5) metallic glass.A series of ceramic-particle reinforced Zr-based metallic glass matrix composites with different volume fractions were prepared using spark plasma sintering.The high-temperature deformation behavior was systematically studied through the high-temperature compression tests and the establishment of a multi-particle random distribution model for numerical simulation.The results show that both composites show strain hardening after stress overshoot at 421℃.Al_(2)O_(3)-reinforced composites show strain hardening after yield at 441℃.For Si_(3)N_(4)-reinforced composites,when the volume fraction of the second phase is less than 25%,it show strain hardening after yield.When the volume fraction of the second phase is greater than 25%,the material shows strain hardening after stress overshoot.The difference in high-temperature deformation behavior between the two metallic glass matrix composites is related to the morphology of the reinforcing phase and the uneven distribution of reinforcing phase due to the agglomeration behavior.

关 键 词：非晶合金复合材料 热塑性成形 高温变形行为 数值模拟 

分 类 号：TG139.8[一般工业技术—材料科学与工程]