Microstructure, solidification behavior and mechanical properties of Al-Si-Mg-Ti/TiC fabricated by selective laser melting

Xinwei，Li1,2; Shi，Shi3; Shuang，Han1,2; Xiaogang，Hu1,2; Qiang，Zhu1,2; Hongxing，Lu1; Wenwu，Li4; Yusheng，Shi4; Hui，Ding5

2020-08-01

10.1016/j.addma.2020.101326

Additive Manufacturing   影响因子和分区

2214-8604

2214-8604

Ball-milled Ti/TiC composite particles (TiC nanoparticles assembled on Ti microparticles) were designed, prepared, and mixed with Al-Si-Mg powder to fabricate an Al-Si-Mg-Ti alloy with TiC nanoparticles (Al-Si-Mg-Ti/TiC) by selective laser melting (SLM). Microstructure features, solidification behavior, and mechanical properties were investigated, and the relationship among them was established. The SLM-manufactured Al-Si-Mg-Ti/TiC material exhibited fine equiaxed-shaped α(Al) grains with nanoscale SiTi phases and Mg segregation along the grain boundaries. This structure benefited from heterogeneous nucleation as well as the grain growth restriction capabilities of TiC nanoparticles on α(Al), fast diffusion of Ti in the superheated Al liquid, and high chemical activity of Ti to Si during solidification. Furthermore, Ti enrichment in some local areas of the high-temperature pool and the consequently intense Marangoni convection improved the wettability between TiC nanoparticles and liquid Al without the interfacial reaction. Consequently, the SLM-manufactured Al-Si-Mg-Ti/TiC showed a high ultimate tensile strength of up to 562 ± 7 MPa and an elongation of up to 8.8 % ± 1.3 % before fracture. These increased mechanical properties are attributed to the combined effect of grain refinement and Orowan and load-bearing strengthening mechanisms.

Al-Si-Mg-Ti/TiC Mechanical properties Microstructure Powder bed fusion Selective laser melting

SCI ; EI

英语

第一 ; 通讯

National Natural Science Foundation of China[51801096] ; China Postdoctoral Science Foundation[1112000139] ; Shenzhen Science and Technology Project[JCYJ20180305123432756] ; Huazhong University of Science and Technology[P2019-026][P2019-025]

Engineering ; Materials Science

Engineering, Manufacturing ; Materials Science, Multidisciplinary

WOS:000555842400001

ELSEVIER

20202608871703

Nucleation ; Textures ; Aluminum alloys ; Titanium carbide ; Melting ; Nanoparticles ; Fabrication ; Silicon alloys ; Grain growth ; Selective laser melting ; Tensile strength ; Magnesium alloys ; Grain refinement ; Solidification ; Grain boundaries

Aluminum Alloys:541.2 ; Magnesium and Alloys:542.2 ; Titanium and Alloys:542.3 ; Alkaline Earth Metals:549.2 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Reproduction, Copying:745.2 ; Nanotechnology:761 ; Chemical Operations:802.3 ; Inorganic Compounds:804.2 ; Solid State Physics:933 ; Crystal Growth:933.1.2

2-s2.0-85086805051

Scopus

1.Shenzhen Key Laboratory for Additive Manufacturing of High-performance Materials,Southern University of Science and Technology,Shenzhen,518055,China
2.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering,Shenzhen Durability Center for Civil Engineering,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen,518060,China
4.State Key Laboratory of Material Processing and Die & Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,430074,China
5.School of Materials Science and Engineering,Southeast University,Nanjing,211189,China

Xinwei，Li,Shi，Shi,Shuang，Han,et al. Microstructure, solidification behavior and mechanical properties of Al-Si-Mg-Ti/TiC fabricated by selective laser melting[J]. Additive Manufacturing,2020,34.

Xinwei，Li.,Shi，Shi.,Shuang，Han.,Xiaogang，Hu.,Qiang，Zhu.,...&Hui，Ding.(2020).Microstructure, solidification behavior and mechanical properties of Al-Si-Mg-Ti/TiC fabricated by selective laser melting.Additive Manufacturing,34.

Xinwei，Li,et al."Microstructure, solidification behavior and mechanical properties of Al-Si-Mg-Ti/TiC fabricated by selective laser melting".Additive Manufacturing 34(2020).