期刊
INTERNATIONAL JOURNAL OF PLASTICITY
卷 136, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2020.102878
关键词
Mg-RE alloy; Tension-compression asymmetry; Slip trace analysis; Slip/twinning activity; Pyramidal < c plus a > slip; Asymmetric slip
资金
- National Natural Science Foundation of China [51401172, 51601003]
- Sichuan Science and Technology Program [2019YJ0238]
- open funding of International Joint Laboratory for Light Alloys (MOE), Chongqing University
The addition of different concentrations of Y significantly affected the mechanical properties, grain-scale slip activity, and orientation heterogeneity of extruded Mg alloys during tension and compression. Increasing Y content led to noticeable changes in slip activity, while tension-compression asymmetry also showed variations.
The asymmetric mechanical response and corresponding statistical grain-scale slip/twinning activity for extruded Mg-(0 similar to 5 wt%)Y sheets during room-temperature uniaxial tension and compression along the extruded direction were investigated using slip trace analysis and EBSD-based misorientation analysis. The tension-compression asymmetry, in terms of yield strength, ultimate strength and uniform elongation, reduced with the addition of 0.5% Y to Mg. Increasing the Y concentration to 5% resulted in a reversed yield asymmetry (compressive yield strength > tensile yield strength). The non-basal slip activity increased (up to 31%) and the twinning activity decreased with increasing Y content, for both tension and compression. The Y-induced texture change did not significantly affect the pyramidal slip, while it promoted basal slip and suppressed prismatic slip. The observed trends of the slip activity suggested that the critical resolved shear stress (CRSS) ratios of CRSSpyramidal /CRSSbasal and CRSSpyramidal /CRSSprismatic decreased with Y addition. The correlation between macroscopic asymmetric behavior and slip/twinning activity implied that the pronounced pyramidal slip, together with the negligible twinning, were responsible for the reversed yield asymmetry. A higher activity of pyramidal slip was observed when the slip plane underwent tension compared with that for compression.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据