...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Variation of strain rate sensitivity of an aluminum alloy in a wide strain rate range: Mechanism analysis and modeling
【24h】

Variation of strain rate sensitivity of an aluminum alloy in a wide strain rate range: Mechanism analysis and modeling

机译：铝合金在宽应变率范围内的应变率敏感性变化：机理分析与建模

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 significant variation of strain rate sensitivity (SRS), i.e. the non-linear characteristics of SRS, within wide strain and strain rate ranges in high strain rate forming (HSRF) leads to the complexity of constitutive behaviors of aluminum alloys. Therefore, in order to achieve accurate simulation of HSRF process, a panoramic description of the SRS variation and related mechanisms are required within wide ranges. To address this problem, taking 5A06 aluminum alloy as an example, three distinct SRS zones were determined at 0.001 s(-1)-5000 s(-1) in the present work, including quasi-static negative SRS zone (Zone-I), positive SRS zone at dynamic strain rate (Zone-II) and negative SRS zone at high strain and strain rate (Zone-III). Then, the mechanism for that in Zone-II is attributed to the conversion from dislocation glide to viscous drag through thermal activation analysis. In Zone-III, the dominant mechanisms are the change of dislocation configuration from dislocation cells and dislocation bands to subgrains in adiabatic shear bands in compression and to the increasing volume fraction of voids in tension, respectively, which is proved by SEM and TEM observations. Consequently, the effect of dislocation evolution on the SRS was quantitatively characterized and the nonlinear rate dependent stress responses of the aluminum alloy in a wide strain rate range were captured. (C) 2016 Elsevier B.V. All rights reserved.
机译：在高应变速率成形（HSRF）中，在宽应变和应变速率范围内，应变速率灵敏度（SRS）的显着变化，即SRS的非线性特性，导致铝合金的本构行为的复杂性。因此，为了实现HSRF过程的精确仿真，需要在宽范围内对SRS变化及其相关机制进行全景描述。为了解决这个问题，以5A06铝合金为例，在当前工作中，在0.001 s（-1）-5000 s（-1）下确定了三个不同的SRS区域，包括准静态负SRS区域（Zone-I）。 ，动态应变率下的正SRS区（Zone-II）和高应变率下的负SRS区（Zone-III）。然后，通过热活化分析，II区的机理归因于从位错滑移到粘性阻力的转换。在Ⅲ区，主要机制是位错构型从位错单元和位错带到绝热剪切带中的亚晶粒在压缩中的变化以及在拉伸中空隙体积分数的增加，这由SEM和TEM观察证明。因此，定量表征了位错演化对SRS的影响，并捕获了在宽应变速率范围内铝合金的非线性速率依赖性应力响应。 （C）2016 Elsevier B.V.保留所有权利。

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