Three regions of dislocation creep in in situ TiB fiber-reinforced α-titanium matrix composite
Three regions of dislocation creep in in situ TiB fiber-reinforced α-titanium matrix composite
复制标题
原位 TiB 纤维增强 α-钛基复合材料中位错蠕变的三个区域
DOI：
10.2320/matertrans.43.1647
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发表时间：
2002
影响因子：
1.2
通讯作者：
K. Kuribayashi
中科院分区：
文献类型：
--
作者：
K. Kawabata;E. Sato;K. Kuribayashi
考虑了金属基复合材料在蠕变过程中不可避免的扩散和塑性两个协调过程，分析了金属基复合材料的稳态蠕变行为。蠕变实验使用的模型材料，原位TiB纤维增强纯a-Ti基复合材料，具有良好的界面结合，适度的扩散调节速率和没有细氧化物分散体。应变速率与应力的关系呈双对数曲线，表明在高应力、中应力和低应力下，合金存在塑性调节控制区、扩散调节控制区和完全扩散调节区。这三个区域的激活能分别与α-Ti的体积、界面和体积扩散的激活能接近。
The steady-state creep behavior of metal matrix composites was analyzed via consideration of two accommodation processes, diffusion and plastic, which are inevitable for the materials to continue creep deformation. The creep experiments were performed using a model material, in situ TiB fiber-reinforced pure a-Ti matrix composite, which has a good interfacial bonding, a moderate diffusional-accommodation rate and no fine oxide dispersions. A sigmoidal curve of strain rate and stress relation in a double logarithmic plot was observed, indicating the presence of three deformation regions: plastic-accommodation-control region, diffusional-accommodation-control region and complete diffusional-accommodation region, at high, middle and low stresses, respectively. The activation energies in the three regions were close to those of volume, interface, and volume diffusion of a-Ti, respectively.