NbCr_2/Nb合金高温力学行为
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摘要
在800～1200℃的变形温度,0.001～0.1 s~(-1)的应变速率条件下对通过机械合金化+热压工艺制备的成分为Nb-22.5Cr的NbCr_2/Nb合金进行了高温压缩试验,研究了合金的高温力学行为,并通过透射电子显微镜观察分析了合金的变形机制。结果表明:NbCr_2/Nb合金的峰值强度随着变形温度的升高,应变速率的降低而下降。基体Nb的变形机制主要为位错的滑移;而NbCr_2的变形机制是通过层错、孪晶、不全位错等方式进行。
NbCr_2/Nb alloy with the composition of Nb-22.5 at%Cr was prepared by mechanical alloying and hot pressing process. Then compression tests were carried out under the condition of 800～1200℃ and 0.001 ～0.1 s~(-1). High temperature mechanical behavior and deformation mechanisms of the alloy were investigated by conventional transmission electron microscopy. The results show that the peak strength of the NbCr_2/Nb alloy decreases with the increase of deformation temperature and the decrease of strain rate. The main deformation mechanism of Nb matrix is the slip of dislocation. While, the deformation mechanism of the Laves phase NbCr_2 is through stacking fault/twins and partial dislocation.
NbCr_2/Nb alloy with the composition of Nb-22.5 at%Cr was prepared by mechanical alloying and hot pressing process. Then compression tests were carried out under the condition of 800～1200℃ and 0.001 ～0.1 s~(-1). High temperature mechanical behavior and deformation mechanisms of the alloy were investigated by conventional transmission electron microscopy. The results show that the peak strength of the NbCr_2/Nb alloy decreases with the increase of deformation temperature and the decrease of strain rate. The main deformation mechanism of Nb matrix is the slip of dislocation. While, the deformation mechanism of the Laves phase NbCr_2 is through stacking fault/twins and partial dislocation.
引文
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