Effects of strain rate on the low cycle fatigue behavior of AZ31B magnesium alloy processed by SMAT
| Autor: | Jianwen Gao, Xiang Guo, Suzhou Wu, Gang Chen, Hong Gao, Yun Cui |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering Metallurgy Metals and Alloys 02 engineering and technology Slip (materials science) Strain rate 021001 nanoscience & nanotechnology 01 natural sciences Mechanics of Materials Residual stress Ball size 0103 physical sciences Materials Chemistry Low-cycle fatigue Surface layer Magnesium alloy 0210 nano-technology Crystal twinning |
| Zdroj: | Journal of Alloys and Compounds. 735:536-546 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2017.11.141 |
| Popis: | A gradient nanocrystallined (NC) surface layer was generated on AZ31b magnesium alloy by means of surface mechanical attrition treatment (SMAT). The effects of strain rate and ball size on low cycle fatigue behavior of the SMATed samples were studied under strain-controlled mode. It is found that under the same strain rate, the fatigue life of the SMATed samples is significantly enhanced compared with the coarse-grained (CG) samples, and that the fatigue life of the SMATed samples treated with 3 mm balls is longer than that of those treated with 2 mm balls. The enhanced fatigue life of the SMATed samples is mainly attributed to the combined influences of compressive residual stress and NC surface layer suppressing the initiation of cracks. Meanwhile, for both the SMATed and the CG samples, the fatigue life increases with increasing strain rate, owing to the fact that high strain rate favors twinning activity and restricts dislocation slip, thus enhancing the fatigue crack resistance and prolonging the fatigue life. |
| Databáze: | OpenAIRE |
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