Processing and Mechanical Properties of Ti3SiC2: II, Effect of Grain Size and Deformation Temperature
Processing and Mechanical Properties of Ti3SiC2: II, Effect of Grain Size and Deformation Temperature
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DOI：
10.1111/j.1151-2916.1999.tb02167.x
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发表时间：
2004-12
影响因子：
3.9
通讯作者：
T. El-Raghy;M. Barsoum;A. Zavaliangos;S. Kalidindi
中科院分区：
文献类型：
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作者：
T. El-Raghy;M. Barsoum;A. Zavaliangos;S. Kalidindi
在这篇文章中，第二部分的两部分研究，我们报告的力学行为的Ti 3SiC 2。特别是，我们已经评估了细晶粒（3-5 μm）Ti 3SiC 2在简单的压缩和弯曲试验中的机械响应，并将结果与粗晶粒（100-200 μm）Ti 3SiC 2的结果进行了比较。这些测试在25°-1300 ° C的温度范围内进行。在室温下，细晶粒和粗晶粒组织表现出优异的损伤容限性能。在这两种情况下，在高达1200°C的温度下，失效是脆性的。在1300°C下，两种微结构在弯曲和压缩时均表现出塑性变形（>20%）。细晶粒材料在所有温度下都表现出比粗晶粒材料更高的强度。尽管粗颗粒材料不容易受到热冲击（高达1400°C），但细颗粒材料在750°至1000°C之间逐渐受到热冲击。本文中提出的结果提供了证据的两个重要方面的机械行为的Ti 3SiC 2：（i）非弹性变形需要基础滑移和损伤的形成形式的空隙，晶界裂纹，扭结，和分层的个别晶粒，和（ii）损伤的开始不会导致灾难性的失败，因为Ti 3SiC 2可以限制的空间范围内的损害。
In this article, the second part of a two-part study, we report on the mechanical behavior of Ti3SiC2. In particular, we have evaluated the mechanical response of fine-grained (3–5 μm) Ti3SiC2 in simple compression and flexure tests, and we have compared the results with those of coarse-grained (100–200 μm) Ti3SiC2. These tests have been conducted in the 25°–1300°C temperature range. At ambient temperature, the fine- and coarse-grained microstructures exhibit excellent damage-tolerant properties. In both cases, failure is brittle up to ∼1200°C. At 1300°C, both microstructures exhibit plastic deformation (>20%) in flexure and compression. The fine-grained material exhibits higher strength compared with the coarse-grained material at all temperatures. Although the coarse-grained material is not susceptible to thermal shock (up to 1400°C), the fine-grained material thermally shocks gradually between 750° and 1000°C. The results presented herein provide evidence for two important aspects of the mechanical behavior of Ti3SiC2: (i) inelastic deformation entails basal slip and damage formation in the form of voids, grain-boundary cracks, kinking, and delamination of individual grains, and (ii) the initiation of damage does not result in catastrophic failure, because Ti3SiC2 can confine the spatial extent of the damage.