کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
757694 | 1462508 | 2015 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Dynamic tensile behavior of AZ31B magnesium alloy at ultra-high strain rates Dynamic tensile behavior of AZ31B magnesium alloy at ultra-high strain rates](/preview/png/757694.png)
The samples having {0 0 0 1} parallel to extruding direction (ED) present a typical true stress–true strain curve with concave-down shape under tension at low strain rate. Ultra-rapid tensile tests were conducted at room temperature on a textured AZ31B magnesium alloy. The dynamic tensile behavior was investigated. The results show that at ultra-high strain rates of 1.93 × 102 s−1 and 1.70 × 103 s−1, the alloy behaves with a linear stress–strain response in most strain range and exhibits a brittle fracture. In this case, {10-12} < 10-11> extension twinning is basic deformation mode. The brittleness is due to the macroscopic viscosity at ultra-high strain rate, for which the external critical shear stress rapidly gets high to result in a cleavage fracture before large amounts of dislocations are activated. Because {10-12} tension twinning, {10-11} compressive twinning, basal slip, prismatic slip and pyramidal
Journal: Chinese Journal of Aeronautics - Volume 28, Issue 2, April 2015, Pages 593–599