• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >Measurements of defect structures of a cyclically deformed Al-Mg-Si alloy by positron annihilation techniques
【24h】

Measurements of defect structures of a cyclically deformed Al-Mg-Si alloy by positron annihilation techniques

机译：用正电子an没技术测量循环变形Al-Mg-Si合金的缺陷结构

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

Defect distributions close to cracks created by monotonic and fatigue tests in the Al-Mg-Si alloy Al 6013 have been investigated by positron lifetime studies. The defect structure close to the crack surface was studied at sub-μm resolution with a pulsed positron beam, whereas the lateral defect distribution in the crack-tip near region was determined using a scanning positron microscope with a few μm resolution. A high concentration of large vacancy clusters of up to 30 vacancies and voids close to the fatigue crack, as well as a high dislocation density in a region with an extension of ～100 μm around the crack tip, were detected in the fatigued samples. Moreover, the generation of vacancy clusters found in the fatigued samples seems to be independent of the loading history. In monotonically fractured samples, no vacancy clusters have been found. If this difference holds as a general rule, positron lifetime spectroscopy would be suitable to distinguish quantitatively monotonic from fatigue fracture without any further fractographic studies.
机译：通过正电子寿命研究，研究了在Al-Mg-Si合金Al 6013中由单调和疲劳测试产生的接近裂纹的缺陷分布。用脉冲正电子束以亚微米分辨率研究靠近裂纹表面的缺陷结构，而使用分辨率为几微米的扫描正电子显微镜确定裂纹尖端附近区域的横向缺陷分布。在疲劳样品中，发现了高浓度的大型空位簇，其靠近疲劳裂纹的位置多达30个空位和空隙，并且在裂纹尖端周围扩展至〜100μm的区域中具有高位错密度。而且，在疲劳样品中发现的空位簇的产生似乎与装填历史无关。在单调断裂的样品中，未发现空位簇。如果通常保持这种差异，则无需进行进一步的分形学研究，就可以将正电子寿命光谱法从疲劳断裂中定量区分单调性。

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