Influence of Annealing Time on Microstructure and Mechanical Properties of Al-14.5Si Alloy Prepared by Super-Gravity Solidification and Cold-Rolling.
Influence of Annealing Time on Microstructure and Mechanical Properties of Al-14.5Si Alloy Prepared by Super-Gravity Solidification and Cold-Rolling.
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退火时间对超重力凝固冷轧Al-14.5Si合金显微组织和力学性能的影响。
DOI：
10.3390/ma15165475
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发表时间：
2022-08-09
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影响因子：
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本文采用超重力凝固和冷轧工艺制备了Al-14.5Si合金。研究了退火时间对Al-14.5Si合金组织和力学性能的影响。我们的研究结果表明，由于亚微米共晶Si的存在，通过超重力凝固获得了高伸长率，使得传统的冷轧成为可能。冷轧后的屈服强度（~214±11 MPa）显著提高（~68.5%），主要原因是位错密度高。退火过程中，共晶Si发生粗化，导致屈服强度降低。在退火过程中消除内应力和晶格畸变导致拉伸测试时断口下的微裂纹/空洞减少，从而提高了伸长率。
In this paper, super-gravity solidification and cold-rolling were utilized to obtain Al-14.5Si alloys. The influence of annealing time on microstructure and mechanical properties of Al-14.5Si alloys was investigated. Our results indicated that high elongation was achieved by super-gravity solidification due to the submicron eutectic Si, making it possible to undertake the conventional cold-rolling. The yield strength (~214 ± 11 MPa) was significantly enhanced (~68.5%) after cold-rolling mainly due to high dislocation density. The coarsening of eutectic Si could be observed during annealing, which resulted in a decrease in yield strength. The elimination of internal stress and lattice distortion during annealing led to a decrease in micro-cracks/voids beneath the fracture surface during tensile testing, which in turn enhanced the elongation.
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