Strengthening effect of in situ TiC particles in Ti matrix composite at temperature range for hot working
Strengthening effect of in situ TiC particles in Ti matrix composite at temperature range for hot working
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DOI：
10.1016/j.matchar.2016.09.010
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发表时间：
2016-10-01
影响因子：
4.7
通讯作者：
Zhang, Di
中科院分区：
文献类型：
--
作者：
Ma, Fengcang;Shi, Zhongbing;Zhang, Di
在这项工作中，通过热压缩试验和金相技术研究了TiC颗粒增强Ti基复合材料的热加工行为。测量了 TiC 颗粒对流变应力的强化效果。结果发现，与整体 Ti-1100 合金相比，5 vol.% 原位 TiC 增强的 Ti-1100 复合材料的 β t 增加了约 100 K。 TiC颗粒的加入显着增加了流变应力。在热压缩过程中，在应变速率为 10(-1) s(-1) 或 10(-2) s(-1) 以及 1373 K 或 1423 K 时，观察到流变应力急剧下降。使用改进的模型以阈值应力来表征陶瓷增强体的强化效果。变形激活能和阈值应力的计算值随试验温度从1273 K变化到1423 K，复合材料的阈值应力从70 MPa降低到18 MPa。除了温度的影响外，阈值应力的巨大变化可能部分是由于α相向β相的转变造成的。 (C) 2016 Elsevier Inc. 保留所有权利。
In this work, hot-working behavior of Ti matrix composite reinforced with TiC particles was investigated by means of hot compression tests and metallographic techniques. The strengthening effect of TiC particles on flow stress was measured. It was found that there is an about 100 K increase in beta t of the 5 vol.% in situ TiC reinforced Ti-1100 composite compared to that of the monolithic Ti-1100 alloy. The incorporation of TiC particles increased the flow stress significantly. Sharp decreases in flow stress are observed at 10(-1) s(-1) or 10(-2) s(-1) strain rates and 1373 K or 1423 K during hot compression. An improved model was used to characterize the strengthening effect of ceramic reinforcement in term of threshold stress. The calculated values of deformation activation energy and threshold stress vary with test temperature from 1273 to 1423 K, and the threshold stress of the composite decreases from 70 MPa to 18 MPa. Besides the effect of temperature, the great variation of threshold stress may result from the transformation of alpha phase to beta phase partly. (C) 2016 Elsevier Inc. All rights reserved.