La_2O_3-TiC／W复合材料组织结构与力学性能
Structure and mechanical properties of La_2O_3-TiC/W composites

陈勇 ¹ 吴玉程 ¹ 于福文 ¹ 陈俊凌 ²

文摘	采用真空热压烧结法制备La_2O_3-TiC／W复合材料，并对其组织结构和力学性能进行了研究。结果表明：在一定成分范围内，La_2O_3和TiC的加入提高了复合材料的力学性能，La_2O_3和TiC共同作用时的强化效果强于La_2O_3和TiC单独作用的强化效果，但La_2O_3-TiC／W复合材料的密度和相对密度随TiC含量的增加而下降，并进而影响硬度和弹性模量的提高，适量的La_2O_3有益于相对密度的提高；抗弯强度在1％La_2O_3-5％TiC／W成分含量时出现最大值901MPa，而断裂韧性在成分含量为0．5％La_2O_3-10% TiC／W时出现最大值10．07MPa·m~(1/2)。本研究中，1％La_2O_3-5％ TiC／W成分配比时具有较好的综合力学性能。La_2O_3-TiC／W复合材料的强化机制为细晶强化和载荷传递，韧化机制为细晶韧化、裂纹偏转和桥接。
其他语种文摘	The tungsten based composites, co-strengthened by La_2O_3 and TiC with different contents, were prepared by the powder metallurgy method. The structure and mechanical properties at room temperature of La_2O_3- TiC/W composites were investigated. The results show that addition of La_2O_3 and TiC improves the mechanical properties of tungsten composites. The co strengthening effect of La_2O_3 and TiC is better than that of La_2O_3 or TiC. Density and relative density of La_2O_3- TiC/W composites decrease with increasing the TiC content, which influences the hardness and elastic modulus of the composites. La_2O_3 with appropriate content is beneficial to improvement of relative density. The flexural strength has a maximum of 901 MPa with composition of 1 % La_2O_3- 5% TiC/W, and fracture toughness has a maximum of 10. 07 MPa · m~(1/2) with composition of 1% La_2O_3-10% TiC/W. In this experiment, the La_2O_3-TiC/W composite has optimal mechanical properties with addition of 1 wt % La_2O_3 and 5 wt % TiC. The strengthening mechanisms of La_2O_3 - TiC/W composite are fine grain strengthening and load transferring. The toughening mechanisms are fine grain toughening, crack deflection and microbridging.
来源	复合材料学报 ,2008,25(5):1-7 【核心库】
关键词	钨 ; La_2O_3 ; TiC ; 组织结构 ; 力学性能
地址	1. 合肥工业大学材料科学与工程学院, 安徽, 合肥, 230009 2. 中国科学院等离子体物理研究所, 安徽, 合肥, 230031
语种	中文
文献类型	研究性论文
ISSN	1000-3851
学科	冶金工业;金属学与金属工艺
基金	合肥工业大学中青年创新基金 ; 中科院等离子体物理研究所合作项目（103413361）
文献收藏号	CSCD:3413083