期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 798, 期 -, 页码 644-655出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.05.279
关键词
Selective laser melting; In-situ nano-TiB2 decorated Al alloys; Columnar-to-equiaxed transition; Mechanical properties; Neutron diffraction
资金
- National Key Research and Development Program of China [2016YFB1100100]
In components built by selective laser melting (SLM), possible anisotropy in microstructure significantly affects mechanical properties (i.e. service performance) and there is a constant effort to solve this problem. This work carried out a comparative study using fully dense AlSi10Mg alloy and in-situ nano-TiB2 decorated AlSi10Mg composite samples processed by SLM. The aim was at clarifying the effect of integrated nanoparticles on the anisotropy of the as-built component. Microstructure and texture evolution were investigated by scanning and transmission electron microscopy, electron backscatter diffraction, X-ray and neutron diffraction. The SLMed AlSi10Mg sample shows a coarse columnar grain structure with <100> and <110> fiber orientation texture and obvious anisotropy in mechanical properties. However, the nano-TiB2 modified AlSi10Mg sample exhibits fine equiaxed grains, no preferred crystallographic texture and remarkably reduced anisotropy. Besides, both tensile strength and ductility have been improved in the SLMed TiB2 decorated AlSi10Mg sample. The preliminary mechanism upon grain refinement effect due to nano-TiB2 particles on columnar-to-equiaxed transition and reduction of anisotropy was discussed. (C) 2019 Elsevier B.V. All rights reserved.
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