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金属学报  2002 

TiBw与TiCp原位增强钛复合材料的高温蠕变特性

, PP. 994-997

Keywords: 钛基复合材料,蠕变,TiB,TiC

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Abstract:

分别对增强相体积分数为15%的TiBw/Ti和(TiBw+TiCp)/Ti复合材料及相应的基体在798-848K范围内进行了蠕变行为研究.结果表明,两种复合材料的应力因子分别为4.6-4.7和4.3-4.5,激活能为294和343kJ/mo1,比纯钛的晶格扩散激活能高.两种复合材料的抗蠕变能力均比基体好,而(TiBw+TiCp)/Ti的抗蠕变性能比TiBw/Ti还要好.此外,实验表明在三种材料中都没有门槛应力存在.两种复合材料的蠕变机制均为位错攀移机制.

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