• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Materials Science and Engineering >The influence of impurities on the ductility and toughness of a low-temperature-aged U-Nb alloy
【24h】

The influence of impurities on the ductility and toughness of a low-temperature-aged U-Nb alloy

机译：杂质对低温时效U-Nb合金的延展性和韧性的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The effect of impurity level and inclusions on the mechanical properties, especially the ductility and toughness, of two low-temperature-aged U-5.5Nb alloys were extensively investigated. Two U-5.5Nb alloys with different impurity levels, i.e., total C + N contents of 330 and 840 mass ppm, are discussed here. The methods used in the present study were scanning electron microscopy with energy-dispersive X-ray spectroscopy, optical microscopy, time-of-flight secondary ion mass spectrometry, tensile and impact mechanical property tests, and nanoindentation measurement. According to the results, both the low- and high-impurity-level samples contain two types of inclusions, namely, U(N,C) and Nb2C inclusions. The inclusion volume fraction, average inclusion radius, inclusion spacing, and number of inclusion particles per unit area all increase with increasing impurity level. In addition, the ductility, i.e., elongation, reduction in area, and impact toughness decrease with increasing impurity level. However, the impurity level has little effect on the yield strength. The inclusions have a detrimental effect on the ductility and toughness of the alloys because the inclusions are the preferential sites for void nucleation. Based on the experimental observations, an illustration of the failure mechanisms for the tensile and impact fracture behaviors for the low-temperature-aged U-5.5Nb alloy is presented.
机译：广泛研究了杂质含量和夹杂物对两种低温时效U-5.5Nb合金的力学性能（特别是延性和韧性）的影响。本文讨论了两种具有不同杂质含量的U-5.5Nb合金，即总C + N含量分别为330和840质量ppm。本研究中使用的方法是具有能量色散X射线光谱的扫描电子显微镜，光学显微镜，飞行时间二次离子质谱法，拉伸和冲击力学性能测试以及纳米压痕测量。根据结果​​，低和高杂质水平的样品都包含两种夹杂物，即U（N，C）和Nb2C夹杂物。随着杂质含量的增加，夹杂物的体积分数，平均夹杂物半径，夹杂物的间隔以及每单位面积的夹杂物颗粒的数量都增加。另外，随着杂质含量的增加，延展性，即伸长率，面积减小和冲击韧性降低。但是，杂质含量对屈服强度影响很小。夹杂物对合金的延展性和韧性有不利影响，因为夹杂物是空隙成核的优先部位。基于实验观察，给出了低温时效U-5.5Nb合金拉伸和冲击断裂行为的失效机理的图解。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号