4.7 Article

Influence of Si precipitates on fracture mechanisms of AlSi10Mg parts processed by Selective Laser Melting

期刊

ACTA MATERIALIA
卷 175, 期 -, 页码 160-170

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2019.06.013

关键词

Aluminum alloys; Selective laser melting; Coarsening; Fracture; Nanoindentation

资金

  1. European Fund for Regional Development
  2. Walloon Region under convention FEDER IAWATHA
  3. FRS-FNRS

向作者/读者索取更多资源

While it is generally accepted that the rupture of SLM AlSi10Mg tensile specimens occurs at the melt pool boundary, the exact zone and microstructural features responsible for the rupture have not been clearly identified. In this study, the microstructures and local mechanical properties at the melt pool boundary are thus analyzed in details. The Si phase fraction and the Si precipitate spacing are measured by image analysis and SEM-EDS analysis. Hardness tests are performed by nanoindentation. Fracture features are observed on broken samples. It is found that the Heat Affected Zone (HAZ) exhibits low hardness due to coarse non-coherent Si precipitates. Void nucleation occurs at the interface between the coarse Si precipitates and the AI matrix by dislocations piling up. For that reason, the HAZ is found to be the preferential region where fracture is likely to occur. This analysis is confirmed by the matching of Si precipitate spacing within the HAZ with dimple spacing observed in fracture surfaces. Moreover, a simple analytical approach of the thermal history during manufacturing, using Rosenthal's equation, allows elucidating the mechanisms by which the processing conditions affect the fracture behavior. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据