• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Materials Science >Observations of common microstructural issues associated with dynamic deformation phenomena: Twins, microbands, grain size effects, shear bands, and dynamic recrystallization [Review]
【24h】

Observations of common microstructural issues associated with dynamic deformation phenomena: Twins, microbands, grain size effects, shear bands, and dynamic recrystallization [Review]

机译：观察与动态变形现象相关的常见微结构问题：孪晶，微带，晶粒尺寸效应，剪切带和动态再结晶[评论]

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

Plane-wave shock deformation has been shown to produce deformation twins or twin-faults in essentially all metal and alloys. In FCC metals and alloys twinning depends upon stacking-fault free energy (SFE) and a critical twinning pressure; which increases with increasing SFE. For impact cratering where the shock wave is spherical and a prominent deviatoric (shear) stress is involved, metals and alloys with high SFE form microbands coincident with {111} plane traces while low SFE metals and alloys either form mixtures of twins and microbands or microtwins. Oblique shock loading of copper also produces mixtures of twins and microbands. Both microtwins and microbands increase in volume fraction with increasing grain size. BCC iron is observed to twin in both shock loading and as a result of impact cratering. Impact craters, shaped charges, and other examples of extreme deformation and flow at high strain rates exhibit various regimes of shear bands and dynamic recrystallization as a mechanism for solid-state flow. Deformation twins and microbands are also often precursors to this process as well. Examples of these phenomena in FCC materials such as Al, Ni, Cu, stainless steel and brass, and BCC materials such as Fe, W, Mo, W-Ta, and Ta are presented; with emphasis on optical metallography and transmission electron microscopy. (C) 2004 Kluwer Academic Publishers. [References: 57]
机译：平面波冲击变形已显示出在基本上所有金属和合金中都产生变形孪晶或孪晶断层。在FCC中，金属和合金的孪晶取决于堆垛层错自由能（SFE）和临界孪晶压力。随着SFE的增加而增加。对于冲击波，冲击波是球形的并且涉及明显的偏斜（剪切）应力，具有高SFE的金属和合金形成与{111}平面迹线重合的微带，而具有低SFE的金属和合金则形成孪晶和微带或微孪晶的混合物。 。铜的斜向冲击载荷也会产生孪晶和微带的混合物。随着晶粒尺寸的增加，微孪晶和微带的体积分数均增加。观察到BCC铁在冲击载荷和撞击坑中均会孪生。冲击弹坑，定型装药以及高应变率下的极端变形和流动的其他示例显示出各种剪切带和动态重结晶作为固态流动的机制。变形孪晶和微带通常也是该过程的先兆。这些现象在FCC材料（例如Al，Ni，Cu，不锈钢和黄铜）以及BCC材料（例如Fe，W，Mo，W-Ta和Ta）中给出了示例;重点研究光学金相学和透射电子显微镜。 （C）2004 Kluwer学术出版社。 [参考：57]

著录项

相似文献

  • 外文文献
  • 中文文献
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