A titanium composite reinforced by in situ dual-scale particle, high-aspect-ratio TiB whiskers and fine TiC particulates was fabricated by a reactive hot pressing technique from a B4C–Ti system. The composite was subjected to creep investigations in compression at 873–923 K. This composite exhibited a stress exponent of 4.5–4.6 and a creep activation energy of 298 kJ/mol. By comparison, unreinforced Ti exhibited a stress exponent of 5.2–5.3 and a creep activation energy of 259 kJ/mol. No change in the stress exponent with varying creep rates was observed in both composite and unreinforced Ti under the investigated creep rates. The creep resistance of the composite was more than one order of magnitude higher than that of the unreinforced Ti. The load transfer mechanism accounted for this result. The creep of both composite and unreinforced Ti was controlled by lattice diffusion in the titanium matrix.
采用反应热压技术,从 B4C-Ti 体系中制造出了由原位双尺度颗粒、高谱比 TiB 晶须和细 TiC 颗粒增强的钛复合材料。这种复合材料的应力指数为 4.5-4.6,蠕变活化能为 298 kJ/mol。相比之下,未增强的钛的应力指数为 5.2-5.3,蠕变活化能为 259 kJ/mol。在所研究的蠕变速率下,复合钛和未增强钛的应力指数均未随蠕变速率的变化而变化。复合材料的抗蠕变性比未增强钛高出一个数量级以上。载荷传递机制是造成这一结果的原因。复合材料和未增强钛的蠕变都是由钛基体中的晶格扩散控制的。