Steady state creep of in situ TiB plus La2O3 reinforced high temperature titanium matrix composite
Steady state creep of in situ TiB plus La2O3 reinforced high temperature titanium matrix composite
复制标题
原位TiB+La2O3增强高温钛基复合材料的稳态蠕变
DOI：
10.1016/j.msea.2008.09.002
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发表时间：
2009-01-15
期刊：
影响因子：
6.4
通讯作者：
Ji, Bo
中科院分区：
文献类型：
--
作者：
Xiao, Lv;Lu, Wei Jie;Ji, Bo
采用普通铸造和热加工工艺原位合成了TiB和La2O3增强钛基复合材料。在873 - 973K温度范围内研究了基体合金和TiB + La_2O_3增强复合材料的稳态蠕变行为。增强体的加入显著提高了复合材料的抗蠕变性能。基体合金和复合材料的稳态蠕变行为均受位错攀移控制。细化的TiB晶须La_2O_3颗粒是产生阈值应力的主要原因。复合材料的蠕变增强主要归因于低温下的门槛应力和高温下的应力传递效应。建立了复合材料稳态蠕变的幂律本构方程。(C)2008 Elsevier B.V.保留所有权利。
TiB and La2O3 reinforced titanium matrix composite is in situ synthesized by common casting and hot working technologies. Steady state creep behaviors of the matrix alloy and the TiB plus La2O3 reinforced composite are investigated in the temperature range 873-973 K. Creep resistance of the composite is significantly enhanced by the reinforcements. Steady state creep behaviors of the matrix alloy and composite are both controlled by dislocation climbing. The refined TiB whiskers La2O3 particles are responsible for the threshold stresses. Creep enhancement of the composite can be mainly attributed to threshold stresses at lower temperatures and stress transfer effects at higher temperatures. A power-law constitutive equation for steady state creep of the composite is built up. (C) 2008 Elsevier B.V. All rights reserved.