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首页> 外文期刊>Journal of Materials Engineering and Performance >Tension–Compression Asymmetry Improved by Cold Extrusion in Pure Magnesium
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Tension–Compression Asymmetry Improved by Cold Extrusion in Pure Magnesium

机译：通过纯镁的冷挤出改善张力 - 压缩不对称性

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摘要

In this paper, cold extrusion was successfully used to fabricate the fine-grained pure Mg bar with average grain size of 2.5?μm. The microstructure, texture and mechanical properties were evaluated by electron backscattering diffraction and mechanical test. The results showed that the corresponding yield strengths for as-extruded fine-grained pure Mg were 130.8?MPa in tension and 125.6?MPa in compression, leading to a greatly improved yield asymmetry ratio. The improvement in tension–compression asymmetry is mainly due to grain refinement which favors the suppression of deformation twinning in compression and promotion of multi-deformation modes both in tension and compression at small strains.
机译：在本文中，成功地使用冷挤出物制造细粒纯Mg棒，其平均晶粒尺寸为2.5Ωμm。 通过电子反向散射衍射和机械测试评估微观结构，质地和机械性能。 结果表明，挤出细粒纯Mg的相应屈服强度为130.8μm张力和125.6μm的压缩，导致屈服不对称比率大大提高。 张力 - 压缩不对称性的改善主要是由于谷物细化，这些晶粒细化是抑制在小菌株的张力和压缩中的压缩和促进多变形模式的变形和促进。

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