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Interactions between basal dislocations and β1′ precipitates in Mg–4Zn alloy: mechanisms and strengthening
Acta Materialia ( IF 9.4 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.actamat.2020.01.028
R. Alizadeh , J. LLorca

Abstract The mechanisms of dislocation/precipitate interaction as well as the critical resolved shear stress were determined as a function of temperature in an Mg–4 wt% Zn alloy by means of micropillar compression tests. It was found that the mechanical properties were independent of the micropillar size when the cross-section was > 3 × 3 µm2. Transmission electron microscopy showed that deformation involved a mixture of dislocation bowing around the precipitates and precipitate shearing. The initial yield strength was compatible with the predictions of the Orowan model for dislocation bowing around the precipitates. Nevertheless, precipitate shearing was dominant afterwards, leading to the formation of slip bands in which the rod precipitates were transformed into globular particles, limiting the strain hardening. The importance of precipitate shearing increased with temperature and was responsible for the reduction in the mechanical properties of the alloy from 23 °C to 100 °C.

中文翻译:

Mg-4Zn合金中基底位错与β1'析出物的相互作用:机理与强化

摘要 通过微柱压缩试验,位错/沉淀相互作用的机制以及临界解析剪切应力被确定为 Mg-4 wt% Zn 合金中温度的函数。发现当横截面 > 3 × 3 µm2 时,机械性能与微柱尺寸无关。透射电子显微镜显示变形涉及在沉淀物周围的位错弯曲和沉淀物剪切的混合。初始屈服强度与 Orowan 模型对沉淀物周围的位错弯曲的预测一致。然而,沉淀剪切之后占主导地位,导致形成滑移带,其中棒状析出物转变为球状颗粒,限制了应变硬化。
更新日期:2020-03-01
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