Regulating precipitate characteristics in a rolled AZ80 alloy based on twinning and de-twinning deformation

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Characterization Pub Date : 2024-09-14 DOI:10.1016/j.matchar.2024.114363

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Abstract

The effect of twinning and de-twinning on precipitation behavior of a rolled AZ80 alloy has been examined. Results showed that both twinning and de-twinning deformation can promote the precipitation of continuous precipitates. And only dense continuous precipitates can be formed inside twinned and de-twinned regions. The high density crystal defects existing in the twinned and de-twinned regions increase the diffusion rate of solute elements and provide more nucleation sites for precipitation, resulting in a homogeneous and dense distribution of continuous precipitates in these regions. Comparing to direct aging, both post-twinning aging and post-de-twinning aging can remarkably increase the yield strength and peak strength by promoting the precipitation of continuous precipitates. For tension and compression, both direct aging and post-de-twinning aging reduce the strain corresponding to peak strength (ε_p) and static toughness (U_T) to a close level. In contrast, post-twinning aging exhibits little loss in ε_p and largely increases U_T. The strengthening and toughening mechanisms were also discussed in detail.

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基于孪晶和去孪晶变形调节轧制 AZ80 合金中的沉淀特性

研究了孪晶和去孪晶对轧制 AZ80 合金析出行为的影响。结果表明，孪晶和去孪晶变形都能促进连续析出物的析出。只有在孪晶和去孪晶区域内才能形成致密的连续析出物。孪晶和去孪晶区域内存在的高密度晶体缺陷增加了溶质元素的扩散速度，为析出提供了更多的成核点，从而使这些区域内的连续析出物分布均匀且致密。与直接时效相比，捻合后时效和去捻合后时效都能促进连续析出物的析出，从而显著提高屈服强度和峰值强度。对于拉伸和压缩，直接时效和后去捻时效都能将峰值强度（εp）和静韧性（UT）对应的应变降低到接近的水平。与此相反，后捻合时效对εp的影响很小，却在很大程度上提高了UT。此外，还详细讨论了强化和增韧机制。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.