Tensile properties of Ti3SiC2 in the 25–1300°C temperature range
Tensile properties of Ti3SiC2 in the 25–1300°C temperature range
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DOI：
10.1016/s1359-6454(99)00351-1
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发表时间：
2000-01
期刊：
影响因子：
9.4
通讯作者：
M. Radovic;M. Barsoum;T. El-Raghy;J. Seidensticker;S. Wiederhorn
中科院分区：
文献类型：
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作者：
M. Radovic;M. Barsoum;T. El-Raghy;J. Seidensticker;S. Wiederhorn
虽然在理解块体多晶Ti_3SiC_2在压缩和弯曲时的力学行为方面已经取得了重大进展，但据我们所知，在文献中还没有涉及其在拉伸下的力学响应的报道。本文报道了细晶（3-5μm）Ti_3SiC_2样品在25-1300°C温度范围内拉伸响应随应变率变化的函数关系。Ti_3SiC_2的拉伸响应是应变速率和温度的强函数。试验温度的升高和应变速率的降低会导致较大的拉伸塑性变形（约25%）。应变率跳跃/跌落试验和应力跳跃蠕变试验证实了从拉伸试验中获得的应变率敏感系数（0.42-0.56）的高值。这些值等于或大于大多数超塑性陶瓷的应变率敏感性。大的应变破坏主要是由于高度的损伤，而不是由于在整个变形过程中保持自相似的微观结构（如超塑性）。陶瓷的超塑性和Ti 3SiC 2的变形之间的另一个重要区别是，在前者中，晶粒通常比这里测试的晶粒小一个数量级。
Although significant progress has been achieved in understanding the mechanical behavior of bulk, polycrystalline Ti3SiC2in compression and flexure, as far as we are aware there are no reports in the literature dealing with its mechanical response under tension. In this paper, we report on the functional dependence of the tensile response of fine-grained (3–5μm) Ti3SiC2samples on strain rates in the 25–1300°C temperature range. The tensile response of Ti3SiC2is a strong function of strain rate and temperature. Increases in testing temperatures, and decreases in testing strain rates lead to large (≈25%) tensile plastic deformations. Strain-rate jump/drop tests and stress-jump creep tests confirm the high values for the strain-rate sensitivity coefficients (0.42–0.56) obtained from the tensile tests. These values are equal to, or greater than, the strain-rate sensitivity of most superplastic ceramics. The large strains to failure result primarily from a high degree of damage, not from a microstructure that remains self-similar throughout deformation (as in superplasticity). Another important distinction between superplasticity in ceramics and the deformation of Ti3SiC2is that in the former the grains are typically about an order of magnitude smaller than the ones tested here.