Meso-scale analysis for peculiar mechanisms of pyramidal slip in hcp metals

HCP金属金字塔滑移特殊机制的细观分析

基本信息

  • 批准号:
    13650722
  • 负责人:
  • 金额:
    $ 2.3万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
  • 财政年份:
    2001
  • 资助国家:
    日本
  • 起止时间:
    2001 至 2003
  • 项目状态:
    已结题

项目摘要

{112^^-2}<<11>^^^-23> second order pyramidal slip was activated in Mg and Mg-Li single crystals by [112^^-0] tensile test in the range of 77K -293K. Yields stress of each crystal increase with increasing temperature, namely anomalous temperature dependence. The pyramidal slip were also activated in the range of 293K -473k and there is no prismatic slip. Activities of pyramidal slip was related to ductility of polycrystalline magnesium.{101^^-1}<<11>^^^-23> first order pyramidal slip was activated in [0001] tensile and compression. Yield stress of prismatic slip in [112^^-0] and [11^^-00] tension and compression were different in spite of same Schmid's factor.In molecular dynamics simulation using Lennard-Jones (L-J) potential, the core of (c+a) screw dislocation extended on two {101^^-1} plane. The screw core was moved between {112^^-2} and {101^^-1} by double cross slip.(c+a) edge dislocation have two type of core structures. Both type of core are not move in negative share and [112^^-0] compression. Partial dislocation cores move by [0001] tensile and compression, and the stress is little different by loading direction. These results shows that motion of (c+a) edge dislocation is affected not only shear stress but also normal stress on slip plane.From simulation results can summarize the deformation process by secondary pyramidal slip.
{112在<11>77 K ~ 293 K范围内,通过[112^^-0]拉伸实验,发现Mg和Mg-Li单晶中存在着&lt; ^^-2}&lt; ^^-23&gt;二级锥体滑移。各晶体的屈服应力随温度的升高而增大,即反常的温度依赖性。在293 K-473 K温度范围内,锥体滑移也被激活,但没有棱柱滑移。多晶镁的塑性与锥体滑移活动有关。{101在<11>[0001]拉伸和压缩过程中,激活了^^-1}&lt; ^-23&gt;一级锥体滑移。尽管Schmid因子相同,但[112^^-0]和[11^^-00]拉伸和压缩条件下滑移滑移的屈服应力不同,在Lennard-Jones(L-J)势的分子动力学模拟中,(c+a)螺型位错核心在两个{101^^-1}面上延伸。螺杆芯通过双交叉滑动在{112^^-2}和{101^^-1}之间移动。(c+a)刃型位错有两种核心结构。这两种类型的核心都不是在负份额和[112^^-0]压缩中移动。部分位错核以[0001]拉压方式运动,应力随加载方向变化不大。结果表明,(c+a)刃型位错的运动不仅受到滑移面上剪应力的影响,而且受到滑移面上正应力的影响,模拟结果可以概括二次锥滑移的变形过程。

项目成果

期刊论文数量(30)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Shinji Ando, Hideki Tonda: "Orientation Dependence of Fatigue Crack Propagation in Magnesium Single Crystals"Magnesium Alloys 2003. 299-304 (2003)
Shinji Ando、Hideki Tonda:“镁单晶中疲劳裂纹扩展的方向依赖性”镁合金 2003. 299-304 (2003)
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    0
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Hideki Tonda, Shinji Ando: "Effect of Temperature and Shear Direction on Yield Stress by {112^^-2}<<11>^^^-23> Slip in HCP"Metallurgical and Materials Transactions. Vol.33A. 831-836 (2002)
Hideki Tonda、Shinji Ando:“HCP 中 {112^^-2}<<11>^^^-23> 滑移对屈服应力的温度和剪切方向的影响”《冶金与材料学报》。
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    0
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Shinji Ando, Takushi Gotoh, Hideki Tonda: "Molecular Dynamics Simulation of <c+a> dislocation Core Sructure in HCP Metals"Metallurgical and Materials Transactions. Vol.33A. 823-829 (2002)
Shinji Ando、Takushi Gotoh、Hideki Tonda:“HCP 金属中 <c a> 位错核心结构的分子动力学模拟”冶金与材料交易。
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    0
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Shinji Ando, Hideki Tonda: "Orientation Dependence of Fatigue Crack Propagation in Magnesium Single Crystals"Magnesium Technology 2003. 299-304 (2003)
安藤真司、富田英树:“镁单晶中疲劳裂纹扩展的方向依赖性”镁技术 2003. 299-304 (2003)
  • DOI:
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  • 影响因子:
    0
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S.Ando, Y.Mine, H.Tonda, K.Takashima: "Fatigue Crack Growth Behavior in Titanium Single Crystal"Ti-2003 Science and Technology. (in press). (2004)
S.Ando、Y.Mine、H.Tonda、K.Takashima:“钛单晶中的疲劳裂纹扩展行为”Ti-2003 科学技术。
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  • 影响因子:
    0
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ANDO Shinji其他文献

ANDO Shinji的其他文献

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{{ truncateString('ANDO Shinji', 18)}}的其他基金

Observation of Variations in Ordered Structures in Aromatic Polymers Induced by Extreme Conditions and Development of Optical and Electronic Functional Materials
极端条件下芳香族聚合物有序结构变化的观测及光电功能材料的开发
  • 批准号:
    25288096
  • 财政年份:
    2013
  • 资助金额:
    $ 2.3万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Relation between basal and non-basal slips in deformation of magnesium
镁变形中基底滑移与非基底滑移的关系
  • 批准号:
    21560688
  • 财政年份:
    2009
  • 资助金额:
    $ 2.3万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Investigation of the Emission Mechanism and Property Control of Highly Fluorescent Polyimides via Application of High Static Pressure
高静压高荧光聚酰亚胺的发射机理和性能控制研究
  • 批准号:
    16350122
  • 财政年份:
    2004
  • 资助金额:
    $ 2.3万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Investigation of the Structures and Dynamics of Fluoropolymers Using Novel Methods of Solid-state ^<19>F NMR Spectroscopy.
使用固态19 F NMR波谱新方法研究含氟聚合物的结构和动力学。
  • 批准号:
    13450387
  • 财政年份:
    2001
  • 资助金额:
    $ 2.3万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Control of Dispersion and Shapes of Metallic Nano-particles Generated in Polymer-metal Complex Systems and Development of Functional Materials for Optical Devices.
聚合物-金属复合体系中产生的金属纳米颗粒的色散和形状控制以及光学器件功能材料的开发。
  • 批准号:
    10555222
  • 财政年份:
    1998
  • 资助金额:
    $ 2.3万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B).
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