Localized shear deformation in magnesium alloy by four-point bending
Localized shear deformation in magnesium alloy by four-point bending
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DOI：
10.1016/j.msea.2020.139851
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发表时间：
2020-08
期刊：
影响因子：
6.4
通讯作者：
Y. Yoshida;J. Shibano;Mikiya Ogura;Kota Saito;K. Kajiwara
中科院分区：
文献类型：
--
作者：
Y. Yoshida;J. Shibano;Mikiya Ogura;Kota Saito;K. Kajiwara
利用同步辐射（SR）白色X射线和透射电子显微镜（TEM）研究了镁合金在四点弯曲试验后的局部剪切变形。在四点试验的试样尺寸为高度1 mm的情况下，SR白色X射线的（0002）晶粒组的结果显示孪晶变形减少，（10 1 <$0）晶粒组的结果显示在弯曲AZ 31 B镁合金中从压缩表面侧0.4mm的局部区域处的晶格应变最小。TEM结果表明，孪晶变形在局部区域沿着（0002）晶粒群的积分强度逐渐减小，平行孪晶间的位错在局部区域密集。此外，在0.4 mm处发现孪晶中的滑移活动。因此，在压缩侧的局部区域发生局部剪切变形。
We demonstrated the localized shear deformation of the Mg alloy after four-point bending tests using synchrotron-radiation (SR) white X-rays and transmission electron microscopy (TEM). In the case of a specimen size with 1-mm height for the four-point test, the results for the (0002) grain group by the SR white X-rays indicated the reduction of twin deformation, and the results for the (10 1¯ 0) grain group indicated a minimum lattice strain at a 0.4-mm local area from the compression surface side in the bent AZ31B Mg alloy. The TEM results revealed that twin deformation decreased at the local area along with the integrated intensity of the (0002) grain group, and dense dislocations between parallel twins were observed in the local area. Moreover, the slip activity in twin was found at 0.4 mm. Thus, localized shear deformation occurred at local area of the compression side.