Al2O3/(W, Ti)C纳米复合陶瓷材料的力学性能与强韧化机理

山东大学学报(工学版)

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Al₂O₃/(W, Ti)C纳米复合陶瓷材料的力学性能与强韧化机理

周咏辉，艾兴，赵军，袁训亮，薛强

山东大学机械工程学院，山东济南 250061

收稿日期:2007-03-01 修回日期:1900-01-01 出版日期:2008-02-16 发布日期:2008-02-16
通讯作者: 周咏辉

Toughening and strengthening mechanisms of the mechanical properties of Al₂O₃/(W, Ti)C nanocomposite

ZHOU Yong-hui, AI Xing, ZHAO Jun, YUAN Xun-liang, XUE Qiang

School of Mechanical Engineering, Shandong University, Jinan 250061， China

Received:2007-03-01 Revised:1900-01-01 Online:2008-02-16 Published:2008-02-16
Contact: ZHOU Yong-hui

摘要/Abstract

摘要： 采用纳米和亚微米级的α-Al₂O₃，以及微米级的(W,Ti)C粉体为原料，制备了Al₂O₃/(W,Ti)C纳米复合陶瓷材料.在基体Al₂O₃含有体积分数为11%的纳米Al₂O₃时复合材料的抗弯强度和断裂韧性达到最优，其抗弯强度、断裂韧性和硬度分别为840MPa,6.55MPa·m^1/2和20.1GPa.TEM实验表明，纳米颗粒的加入明显抑止了基体晶粒的长大，形成了典型的骨架结构，材料的断裂方式为沿晶断裂和穿晶断裂的混合.内晶型和晶间型第二相颗粒产生的残余应力场、断裂模式的改变和晶粒细化强化促进了复合材料抗弯强度和断裂韧性的提高.

关键词: Al₂O₃, (W, Ti)C, 纳米复合陶瓷材料, 强韧化机理

Abstract: Al₂O₃/(W, Ti)C ceramic nanocomposites were fabricated from nanocrystalline α-Al₂O₃, micro-crystalline α-Al₂O₃ and (W, Ti)C. The flexural strength and fracture toughness can be remarkably increased by adding nano Al₂O₃(11%) particles into Al₂O₃ matrix. The flexural strength, fracture toughness and hardness are respectively 840MPa, 6.55MPa·m^1/2 and 20.1GPa. TEM experiments indicate that low contents of nano-particles could refine matrix grains, and the microstructure of the material is a homogenous skeleton structure. The fracture characteristics are mixed by inter-granular fracture and transgranular fracture. Strengthening and toughening mechanisms are interpreted due to intragranular and inter-granular grain synergistic residual stress, changes of fracture manner and an increase of the fracture toughening.

Key words: Al₂O₃, (W, Ti)C, ceramic nanocomposite, strengthening and toughening mechanisms

中图分类号:

TB332

周咏辉,艾兴,赵军,袁训亮,薛强 . Al₂O₃/(W, Ti)C纳米复合陶瓷材料的力学性能与强韧化机理[J]. 山东大学学报(工学版), 2008, 38(1): 1-4 .

ZHOU Yong-hui,AI Xing,ZHAO Jun,YUAN Xun-liang,XUE Qiang . Toughening and strengthening mechanisms of the mechanical properties of Al₂O₃/(W, Ti)C nanocomposite[J]. JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE), 2008, 38(1): 1-4 .

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Al₂O₃/(W, Ti)C纳米复合陶瓷材料的力学性能与强韧化机理

Toughening and strengthening mechanisms of the mechanical properties of Al₂O₃/(W, Ti)C nanocomposite

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