Modification of Eutectic Si in Al-Si-(Ba) Alloy by Inducing a Novel 9R Structure in Twins

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Abstract
The change of twinning morphology plays an important role in the modification of Al-Si alloys, which are widely used in industrial applications. However, the interpretation of this change is still insufficient. In this work, the microstructure of twins was investigated in two kinds of Al-Si alloys with different additions of Ba using high-resolution transmission electron microscopy (HRTEM). Unlike the normal {111} twin that exists in Ba-free alloy, discontinuous twins and multiple twins were observed in the Ba-containing alloy. In addition, the 9R structure formed by the dissociation of twins was firstly observed at the turning of discontinuous twins and the intersection of multiple twins in Al-Si alloys.
Funding Information
  • National Key R&D Program of China (2017YFB0305501)
  • National Natural Science Foundation of China (51601003, 51401172, 51074106, 51374145, 51501023)
  • Natural Science Foundation of Heilongjiang Province of China (QC2017061)
  • HarBin Science and Technology Burean (2017RAQXJ066)

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