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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Deformation and microstructure evolution of a high strain rate superplastic Mg-Li-Zn alloy
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Deformation and microstructure evolution of a high strain rate superplastic Mg-Li-Zn alloy

机译:高应变率超塑性Mg-Li-Zn合金的变形和组织演变

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摘要

An Mg-8Li-2Zn alloy plate was prepared through a two-pass extrusion process, and the high-temperature behavior of the alloy was investigated at 473-593 K under the initial strain rate of 1.0x 10~(-2)-1.0X 10~(-1) s~(-1). The results indicated that the alloy exhibits a significant high strain rate super-plasticity with a maximum elongation of 279% under an initial strain rate of 1.0 X 10~(-2) s~(-1).The activation energy is 89.4 kj/mol, indicating that the dominant deformation mechanism in the alloy is grain-boundary sliding controlled by grain-boundary diffusion. Cavities nucleate and coalesce during deformation, which is one of the results leading to the fracture of the material.
机译:通过两次挤压工艺制备了Mg-8Li-2Zn合金板,并在初始应变率为1.0x 10〜(-2)-1.0的情况下,在473-593 K下研究了合金的高温行为。 X 10〜(-1)秒〜(-1)。结果表明,该合金在1.0 X 10〜(-2)s〜(-1)的初始应变速率下表现出明显的高应变速率超塑性,最大伸长率为279%,活化能为89.4 kj /摩尔,表明合金中的主要变形机制是由晶界扩散控制的晶界滑动。空腔在形变过程中成核并聚结,这是导致材料断裂的结果之一。

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