...
  • 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 Portevin-Le Chatelier effect in p-phase Mg-14.3Li-0.8Zn alloy
【24h】

The Portevin-Le Chatelier effect in p-phase Mg-14.3Li-0.8Zn alloy

机译：p相Mg-14.3Li-0.8Zn合金中的Portevin-Le Chatelier效应

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 effects of strain rate, ε. and temperature, 7, on the occurrence of the Portevin-Le Chatelier (PLC) effect in tensile hot-rolled (HR) and solid-solution treated (SS) β-phase LZ141 magnesium alloy were studied. The HR alloy has an intrinsically higher dislocation density and fewer solute atoms than the SS alloy. This characteristic, in terms of the dynamic strain aging (DSA) mechanism, explains why the PLC effect does not occur in HR alloy for ε ranging from 3.33 × 10~(-4) s~(-1) to 6.67 × 10~(-2) s~(-1) but does occur in SS alloy, in which Type B and Type C serrations appear at ε=(3.33-6.67) × 10~(-3) s~(-1) and at ε=(3.33-6.67) × 10~(-4)s~(-1), respectively. The SS alloy exhibits a negative strain rate sensitivity (SRS) at room temperature. The negative SRS also supports the proposition that the DSA mechanism causes the PLC effect. In the study of the effect of T on the occurrence of the serrated flow, for HR alloy at T≤0℃, Type A serrations were observed. In contrast, in the SS alloy, Type C serrations occurred in the curves at 25 ℃ and 0 ℃, and Type B serrations occurred at -25 ℃ and -50 ℃. These results can also be explained by the DSA mechanism. Large serrated stress variations were found in the tensile curves of SS alloy at -25 ℃ and -50 ℃, but no twinning was found near the fractured surface.
机译：应变率ε的影响。和温度7，研究了Portevin-Le Chatelier（PLC）效应在拉伸热轧（HR）和固溶处理（SS）β相LZ141镁合金中的发生情况。与SS合金相比，HR合金本质上具有更高的位错密度和更少的溶质原子。就动态应变时效（DSA）机理而言，这一特性解释了为什么HR合金在ε为3.33×10〜（-4）s〜（-1）至6.67×10〜（ -2）s〜（-1）但确实出现在SS合金中，其中B型和C型锯齿出现在ε=（3.33-6.67）×10〜（-3）s〜（-1）和ε= （3.33-6.67）×10〜（-4）s〜（-1）。 SS合金在室温下具有负应变率敏感性（SRS）。否定的SRS还支持DSA机制导致PLC效果的主张。在研究T对锯齿状流动发生的影响时，对于T≤0℃的HR合金，观察到A型锯齿。相反，在SS合金中，C型锯齿出现在25℃和0℃的曲线中，而B型锯齿出现在-25℃和-50℃的曲线中。这些结果也可以通过DSA机制来解释。在-25℃和-50℃时SS合金的拉伸曲线中锯齿状应力变化较大，但在断裂表面附近没有孪晶。

著录项

  • 来源
    《Materials Science and Engineering》 |2014年第27期|33-38|共6页
  • 作者

    S.K. Wu; C. Chien; C.S. Yang; H.Y. Bor;

  • 作者单位

    Department of Materials Science and Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 106, Taiwan,Department of Materials Science and Engineering, National Taiwan University, Taipei 106, Taiwan;

    Department of Materials Science and Engineering, National Taiwan University, Taipei 106, Taiwan;

    Department of Mechanical Engineering, National Taiwan University, Taipei 106, Taiwan;

    Metallurgy Section, Materials and Optoelectronics Research Division, Chung-Shang Institute of Science and Technology, Taoyuan 325, Taiwan;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    The Portevin-Le Chatelier effect; Mechanical characterization; Magnesium alloy; Bulk deformation; Plasticity;

    机译：Portevin-Le Chatelier效应;机械特性镁合金大量变形;可塑性;

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