文摘
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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
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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
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复合材料学报
,2008,25(5):1-7 【核心库】
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关键词
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钨
;
La_2O_3
;
TiC
;
组织结构
;
力学性能
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地址
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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
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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1000-3851 |
学科
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冶金工业;金属学与金属工艺 |
基金
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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)
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文献收藏号
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CSCD:3413083
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