Microstructure of selective laser melted AlSi10Mg alloy
The influence of laser power during selective laser melting (SLM) on the grain morphology and texture component in AlSi10Mg alloy has been investigated, using electron backscattered diffraction (EBSD). Both equiaxed and columnar grains were observed. The formation of equiaxed grains was attributed t...
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doaj-19e9bbca4b3d4aa9b12dcbe0d71502ac2020-11-24T21:39:53ZengElsevierMaterials & Design0264-12752019-04-01168Microstructure of selective laser melted AlSi10Mg alloyXihe Liu0Congcong Zhao1Xin Zhou2Zhijian Shen3Wei Liu4School of Materials Science and Engineering, Tsinghua University, Beijing 100084, ChinaSchool of Materials Science and Engineering, Tsinghua University, Beijing 100084, China; Corresponding authors.Science and Technology on Plasma Dynamics Lab, 710038 Xi'an, ChinaSchool of Materials Science and Engineering, Tsinghua University, Beijing 100084, China; Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, SwedenSchool of Materials Science and Engineering, Tsinghua University, Beijing 100084, China; Corresponding authors.The influence of laser power during selective laser melting (SLM) on the grain morphology and texture component in AlSi10Mg alloy has been investigated, using electron backscattered diffraction (EBSD). Both equiaxed and columnar grains were observed. The formation of equiaxed grains was attributed to the huge thermal gradient on the border of melt pool and the columnar to equiaxed transition (CET) occurred in front of the columnar grains. The grain size of low laser power sample was found smaller than that of higher ones. A fine pseudoeutectic structure, in which Si existed as fibrous, was observed because of the high cooling rate. This paper, from a new angle, explained the formations of three different zones across the melt pool, which were differentiated by the morphology of Si phase. The three zones correspond to the three temperature zones, which were divided by liquidus and solidus temperature, during the heating by laser beam. The coarse zones are formed by reheating the basic metal to semi-solid state when the temperature is lower than the liquidus temperature but higher than the solidus temperature. Keywords: AlSi10Mg alloy, Selective laser melting, Grains morphology, Al-Si pseudoeutectic, Semi-solid statehttp://www.sciencedirect.com/science/article/pii/S0264127519301145 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Xihe Liu Congcong Zhao Xin Zhou Zhijian Shen Wei Liu |
spellingShingle |
Xihe Liu Congcong Zhao Xin Zhou Zhijian Shen Wei Liu Microstructure of selective laser melted AlSi10Mg alloy Materials & Design |
author_facet |
Xihe Liu Congcong Zhao Xin Zhou Zhijian Shen Wei Liu |
author_sort |
Xihe Liu |
title |
Microstructure of selective laser melted AlSi10Mg alloy |
title_short |
Microstructure of selective laser melted AlSi10Mg alloy |
title_full |
Microstructure of selective laser melted AlSi10Mg alloy |
title_fullStr |
Microstructure of selective laser melted AlSi10Mg alloy |
title_full_unstemmed |
Microstructure of selective laser melted AlSi10Mg alloy |
title_sort |
microstructure of selective laser melted alsi10mg alloy |
publisher |
Elsevier |
series |
Materials & Design |
issn |
0264-1275 |
publishDate |
2019-04-01 |
description |
The influence of laser power during selective laser melting (SLM) on the grain morphology and texture component in AlSi10Mg alloy has been investigated, using electron backscattered diffraction (EBSD). Both equiaxed and columnar grains were observed. The formation of equiaxed grains was attributed to the huge thermal gradient on the border of melt pool and the columnar to equiaxed transition (CET) occurred in front of the columnar grains. The grain size of low laser power sample was found smaller than that of higher ones. A fine pseudoeutectic structure, in which Si existed as fibrous, was observed because of the high cooling rate. This paper, from a new angle, explained the formations of three different zones across the melt pool, which were differentiated by the morphology of Si phase. The three zones correspond to the three temperature zones, which were divided by liquidus and solidus temperature, during the heating by laser beam. The coarse zones are formed by reheating the basic metal to semi-solid state when the temperature is lower than the liquidus temperature but higher than the solidus temperature. Keywords: AlSi10Mg alloy, Selective laser melting, Grains morphology, Al-Si pseudoeutectic, Semi-solid state |
url |
http://www.sciencedirect.com/science/article/pii/S0264127519301145 |
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