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首页> 外文期刊>Journal of Materials Science >The role of nanoquasicrystals on the ductility enhancement of as-extruded Mg-Zn-Gd alloy at elevated temperature
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The role of nanoquasicrystals on the ductility enhancement of as-extruded Mg-Zn-Gd alloy at elevated temperature

机译：纳米准晶在高温下挤压Mg-Zn-Gd合金延展性的作用

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摘要

The microstructure and mechanical properties of Mg3.5Zn0.6Gd alloy containing quasicrystals was investigated after extrusion, the role of nanoquasicrystals on the ductility of alloy was analyzed. The results indicate that nanoquasicrystal was formed and distributed along grain boundary and in the matrix for Mg3.5Zn0.6Gd alloy after extrusion. As-extruded Mg3.5Zn0.6Gd alloy containing I-phase showed one relatively random and homogeneous texture due to the local lattice rotation during deformation. The Mg3.5Zn0.6Gd alloy extruded at 673 K exhibits larger elongation about 94% at 473 K, which could been ascribed to the combination of random texture and higher content of I-phase precipitated during extrusion at higher temperature. The a + c type dislocations can be effectively active due to the existence of nanoquasicrystals. The strengthening mechanism of Mg3.5Zn0.6Gd alloy can be explained as the dislocations annihilation effect. This annihilation of dislocations can play a role in the increase of flow strain during deformation.
机译：研究了挤压后含准晶体的Mg3.5Zn0.6Gd合金的显微组织和力学性能，分析了纳米准晶体对合金延展性的作用。结果表明，Mg3.5Zn0.6Gd合金挤压后形成了纳米准晶体，并沿晶界和基体分布。含I相的Mg3.5Zn0.6Gd挤压合金由于变形时局部晶格旋转而呈现出一种相对随机且均匀的织构。在673 K下挤压的Mg3.5Zn0.6Gd合金在473 K下表现出较大的延伸率约94％，这可能归因于无规织构和较高温度下挤压过程中析出的I相含量较高。由于存在纳米准晶体，a + c型位错可以有效地活化。 Mg3.5Zn0.6Gd合金的强化机理可以解释为位错an没效应。位错的an灭可以在变形过程中增加流动应变方面发挥作用。

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