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Dynamic tensile properties and microstructural evolution of extruded EW75 magnesium alloy at high strain rates
Dynamic tensile properties and microstructural evolution of extruded EW75 magnesium alloy at high strain rates
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摘要：
The dynamic tensile properties and microstructural evolution of an extruded EW75 magnesium alloy deformed at ambient temperature and different high strain rates(from 1000 to 3000 s^(-1))along extrusion direction(ED)were investigated by Split Hopkinson Tension Bar(SHTB).The corresponding deformation mechanisms,texture evolution and microstructure changes were analyzed by optical microscope(OM),electron backscatter diffraction(EBSD)and transmission electron microscope(TEM).The results show that the extruded EW75 magnesium alloy along ED exhibits a conventional positive strain rate sensitivity that the dynamic flow stresses increase with in creasing strain rate.Texture measurements show that after dynamic tension,the initial weak texture of extruded EW75 magnesium alloy tansforms to a relatively strong<10-10>//ED texture with increasing strain rates.The microstructural analysis demonstrates that dislocation motion are main deformatin mode to accommodate dynamic tensile deformation at high strain rates.In addition,the interactions of dislocation-dislocation and dislocation-second phase lead to the in crease of flow stress and strain hardening with increasing strain rate.
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节点文献
EW75
magnesium
alloy
High
strain
rates
Split
Hopkinson
test
TEXTURE
MICROSTRUCTURE
研究起点
研究来源
研究分支
研究去脉
引文网络交叉学科
相关学者/机构
期刊影响力
镁合金学报（英文）
主办单位：
China
Association
for
Science
and
Technology
Chinese
Committee
for
Magnesium
and
its
Applications
出版周期：
季刊
ISSN：
2213-9567
CN：
50-1220/TF
开本：
出版地：
174 Shazheng Str., C
邮发代号：
创刊时间：
语种：
出版文献量（篇）
153
总下载数（次）
1
总被引数（次）
0
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